Printer, ink-jet printer and moisturizing device

Abstract

The invention provides a printer, which can move a tension rod towards the front lower direction, can make the tension rod contact with a printed medium moving towards the lower side from the inclined rear upper side, and can apply tension to the medium through the gravity acting on the tension rod. Even when the position of the tension rod changes, the change of the tension applied to the medium by the tension rod can be suppressed. In the printer, a medium printed by a printing mechanism moves toward a front side and then moves toward a lower side. The tension bar (40) contacts the medium moving toward the lower side from the obliquely rear upper side, and applies tension to the medium by gravity acting on the tension bar (40). The tension applying mechanism (12) is provided with: a guide section (43) that linearly guides the tension bar (40) in the front-lower direction; and a biasing member (44) for biasing the tension bar (40) toward the obliquely rear upper side.

Description

Technical Field

[0001] The present invention relates to a printer for printing on long media. Furthermore, the present invention relates to an inkjet printer for printing on long media. Furthermore, the present invention relates to a moisturizing device for moisturizing the nozzle surface of a head unit having multiple inkjet heads. Furthermore, the present invention relates to an inkjet printer including such a moisturizing device. Background Art

[0002] Printers (inkjet printers) for printing on long media are known (see, for example, Patent Document 1). The printer described in Patent Document 1 includes a printer body that prints on the media; a winding roller holding unit that holds the printed media, or winding roller, wound into a roll; and a cylindrical tension rod that contacts the printed media to apply tension to the media. The tension rod contacts the printed media from above to apply tension to the media.

[0003] In addition, inkjet printers for printing on long media have been known in the past (for example, see Patent Document 2). The inkjet printer described in Patent Document 2 includes: an inkjet head (recording head) that ejects ink toward the medium; a carriage that carries the inkjet head; a printing platen that is arranged on the lower side of the inkjet head and carries the medium during printing; and a fan that sucks the medium placed on the printing platen to the printing platen and holds it. The upper surface of the printing platen serves as a support surface for supporting the medium. A plurality of suction holes (through holes) for sucking the medium are formed on the printing platen.

[0004] In the inkjet printer described in Patent Document 2, a space is formed below the printing platen, defined by the printing platen, two wall members, and a bottom member. A fan is mounted on the bottom member and draws air from the space below the printing platen. Specifically, when the fan operates, air is exhausted from the space below the printing platen. As air is exhausted from the space below the printing platen, the media is drawn onto the supporting surface of the printing platen, where it is held by the printing platen. The fan operates during printing.

[0005] Furthermore, a moisturizing device for moisturizing the nozzle surface of a head unit having multiple inkjet heads is known (see, for example, Patent Document 3). The moisturizing device described in Patent Document 3 includes a cap positioned below the nozzle surface of the head unit when not in recording mode, and a moisturizing liquid supply unit that supplies water as a moisturizing liquid to the cap. During non-recording mode, the head unit, mounted on a carriage, moves to the upper side of the cap to moisturize the nozzle surface of the head unit and perform pressure cleaning to eject ink from the nozzles of the inkjet heads onto the cap.

[0006] The moisturizing device described in Patent Document 3 includes a cap comprising a frame, a sponge-like member disposed within the frame, and a first discharge pipe for draining ink and water from the cap. When moisturizing the nozzle surface, the upper surface of the sponge-like member faces the nozzle surface from below, maintaining a fixed distance from the nozzle surface. The moisturizing liquid supply unit includes a water tank and an infusion pump that delivers water from the tank to the cap. The infusion pump, driven by a control unit, supplies water to the cap at a rate equal to or greater than 50% by mass of the ink volume after pressure cleaning.

[0007] Prior art literature

[0008] Patent Literature

[0009] Patent Document 1: Japanese Patent Application Publication No. 2019-195973

[0010] Patent Document 2: Japanese Patent Application Laid-Open No. 2015-74090

[0011] Patent Document 3: Japanese Patent No. 6464793 Summary of the Invention

[0012] Problems to be solved by the invention

[0013] The inventors of this application are developing a printer for printing on long strips of media. The printer under development includes: a printing mechanism for printing on long strips of media; a winding roller holding portion for holding the printed media wound into a roll, i.e., a winding roller; and a tension rod for contacting the printed media between the printing mechanism and the winding roller holding portion to apply tension to the media. In the printer, the width direction of the media coincides with the left-right direction orthogonal to the up-down direction, and the thickness direction of the media when printing is performed by the printing mechanism coincides with the up-down direction. In the printing mechanism, printing is performed on the upper surface of the media. Furthermore, the media printed by the printing mechanism moves toward the front side.

[0014] The inventors of this application are exploring a method for a printer currently under development in which a medium that has been moved forward after printing is subsequently moved downward a predetermined distance, then moved backward a predetermined distance, and then wound up by a winding roller retaining portion. In this printer, when a tension bar is brought into contact with the medium moving backward from below to apply tension to the medium, the tension bar contacts the printed surface of the medium, potentially affecting print quality. On the other hand, when a tension bar is brought into contact with the medium moving backward from above to apply tension to the medium, space must be secured for the medium and the tension bar while the tension bar, which is in contact with the medium, moves downward, potentially increasing the size of the printer in the vertical direction.

[0015] Therefore, the inventors of this application are considering, in a printer currently under development, having a tension bar contact the surface of the media moving downward, opposite the printing surface, to apply tension to the media. Specifically, the inventors are considering having the tension bar contact the media moving downward from the rear side to apply tension to the media. In this case, if the tension bar were to move in the front-to-back direction, it would be necessary to ensure sufficient space for the media and the tension bar when the tension bar in contact with the media moves forward, thus potentially increasing the size of the printer in the front-to-back direction.

[0016] Therefore, the inventors of this application have designed a printer that is currently being developed with a tension bar that is movable in a forward and downward direction. This allows the bar to contact the printed media moving downward from the upper and rearward side, and the weight acting on the bar applies tension to the media. If the center angle of the arc-shaped contact portion of the outer peripheral surface of the tension bar that contacts the media when viewed from the left and right is defined as the media contact angle, then in this printer, the media contact angle varies depending on the position of the tension bar, and the tension applied to the media by the tension bar also varies depending on the position of the tension bar.

[0017] Specifically, as the tension bar moves diagonally forward and downward, the media contact angle increases, and the tension applied to the media by the tension bar increases. As the tension bar moves diagonally backward and upward, the media contact angle decreases, and the tension applied to the media by the tension bar decreases. Furthermore, as the media travels faster, the amount of tension bar movement increases. Therefore, in printers currently under development, increasing media travel speeds may cause significant fluctuations in media tension, leading to unstable media behavior.

[0018] Therefore, the subject of the present invention is to provide a printer, which includes: a printing mechanism for printing on a long medium; a winding roller holding portion for holding the printed medium wound into a roll, i.e., a winding roller; and a tension rod for contacting the printed medium between the printing mechanism and the winding roller holding portion to apply tension to the medium. In this printer, even if the tension rod can be moved in the front and lower direction, so that the tension rod contacts the printed medium moving toward the lower side from the upper rear side, and tension is applied to the medium by the gravity acting on the tension rod, the change in the tension of the medium applied by the tension rod when the position of the tension rod changes can be suppressed.

[0019] Furthermore, in the inkjet printer described in Patent Document 2, the ink mist generated when ink is ejected from the inkjet head is sucked in by a fan and enters the space below the printing platen through a suction hole. The inventors of this application have clarified that, in the inkjet printer described in Patent Document 2, there is a risk that the ink mist that enters the space below the printing platen may solidify and become solid matter within the space below the printing platen or in the exhaust path of air from this space. Furthermore, there is a risk that the solid matter may be discharged to the outside of the inkjet printer along with the air discharged from the space below the printing platen. Furthermore, the inventors of this application have clarified that if the solid matter is discharged to the outside of the inkjet printer along with the air discharged from the space below the printing platen, there is a risk that the solid matter may adhere to the media and contaminate the media.

[0020] Therefore, the subject of the present invention is to provide an inkjet printer used for printing on long strips of media, which can prevent the media from being contaminated by the solid matter even if the solidified solid matter of the ink mist is discharged to the outside of the inkjet printer together with the air that enters the hollow interior of the platen when the media is sucked onto the platen.

[0021] Furthermore, the moisturizing device described in Patent Document 3 supplies water to the cap in such a manner that the water supply amount is 50% or more by mass relative to the amount of ink after pressure cleaning. If the water supply amount is 50% or more by mass relative to the amount of ink after pressure cleaning, water will not be supplied to the cap even if the amount of ink and water in the cap (i.e., the amount of liquid in the cap) decreases. Therefore, with the moisturizing device described in Patent Document 3, there is a risk that the liquid level in the cap will drop excessively, making it difficult to properly moisturize the nozzle surface of the head unit.

[0022] Therefore, the present invention aims to provide a moisturizing device for moisturizing the nozzle surface of a head unit having multiple inkjet heads, which prevents the liquid level of moisturizing liquid stored in a main tank from dropping excessively, thereby enabling the nozzle surface to be properly moisturized using the moisturizing liquid stored in the main tank. Furthermore, the present invention aims to provide an inkjet printer including such a moisturizing device.

[0023] Technical means to solve the problem

[0024] In order to solve the above-mentioned problem, the printer of the present invention is characterized in that it includes: a printing mechanism for printing on a long medium; a winding roller holding portion for holding a winding roller of the printed medium wound into a roll; and a tension-applying mechanism having a tension rod, wherein the tension rod contacts the printed medium between the printing mechanism and the winding roller holding portion to apply tension to the medium, wherein the width direction of the medium coincides with the left-right direction perpendicular to the up-down direction, and the thickness direction of the medium when printed by the printing mechanism coincides with the up-down direction. When the direction perpendicular to the up-down direction and the left-right direction is defined as the front-back direction, the medium printed by the printing mechanism moves toward the front side and then toward the bottom side. The tension rod is arranged below the printing mechanism, contacts the medium moving toward the bottom side from the upper and rear side, and applies tension to the medium by the weight acting on the tension rod. The tension-applying mechanism includes: a guide portion for linearly guiding the tension rod in the lower and front direction; and a biasing member for biasing the tension rod toward the upper and rear side.

[0025] In the printer of the present invention, the tension-applying mechanism includes a force-applying member for applying force to the tension rod toward the upper and rearward sides. The force applied by the force-applying member increases as the tension rod moves toward the lower and frontward sides, and decreases as the tension rod moves toward the upper and rearward sides. That is, in the present invention, even if the media contact angle increases as the tension rod moves toward the lower and frontward sides, the force applied by the force-applying member to the tension rod in the direction in which the tension applied to the media by the tension rod decreases as the tension rod moves toward the lower and frontward sides continues to increase. Furthermore, in the present invention, even if the media contact angle decreases as the tension rod moves toward the upper and rearward sides, the force applied by the force-applying member to the tension rod in the direction in which the tension applied to the media by the tension rod decreases as the tension rod moves toward the upper and rearward sides continues to decrease.

[0026] Therefore, in the present invention, even if the tension rod is movable toward the front and lower direction, and the tension rod is brought into contact with the printed medium moving toward the lower side from the upper rear side, and tension is applied to the medium by the gravity acting on the tension rod, changes in the tension of the medium applied by the tension rod when the position of the tension rod changes can be suppressed.

[0027] In the present invention, the tension-applying mechanism preferably includes two guides and two biasing members, one of which guides the right end of the tension rod and the other guides the left end of the tension rod. One biasing member applies force to the right end of the tension rod, while the other biasing member applies force to the left end of the tension rod. This configuration allows the two biasing members to apply force to the tension rod in a well-balanced manner. Consequently, fluctuations in the tension applied to the medium by the tension rod when the position of the tension rod changes can be effectively suppressed.

[0028] In the present invention, preferably, the tension-giving mechanism includes: two sliders, which are formed independently of the tension rod and can move linearly in the same direction as the moving direction of the tension rod; and a linear scale and a sensor for detecting the position of the tension rod, and the linear scale is fixed to one of the two sliders, one of which contacts the right end of the tension rod from the oblique front lower side, and the other slider contacts the left end of the tension rod from the oblique front lower side, and the force-applying member is engaged with the slider and applies force to the slider toward the oblique rear upper side.

[0029] With this configuration, since the biasing member is engaged with a slider formed independently of the tension rod, there is no need to disengage or reengage the slider and biasing member when, for example, the tension rod is moved away from the guide portion and the media is set into the printer. This simplifies the process of setting the media into the printer. Furthermore, with this configuration, the linear scale is fixed to the slider used to contact the tension rod and apply the biasing force to it, eliminating the need for a separate member to secure the linear scale. This simplifies the structure of the tensioning mechanism.

[0030] In the present invention, the tensioning mechanism preferably includes a tension rod support portion, which is positioned above the guide portion and supports the tension rod, which is positioned away from the guide portion. With this configuration, when the media is set into the printer, the tension rod can be easily positioned above the guide portion, away from the guide portion. This facilitates the placement of the media toward the printer.

[0031] In the present invention, for example, the guide portion guides the tension rod in a direction inclined by 30° to 60° with respect to the front-rear direction when viewed from the left-right direction.

[0032] In the present invention, the printer includes, for example, a heater for heating the printed medium. The heater is arranged below and behind the tension rod, and the winding roller is arranged above and behind the heater. The medium that passes through the tension rod then passes above the heater and moves toward the rear.

[0033] In the present invention, for example, the printing mechanism includes: an inkjet head that sprays ink onto a medium; a platen that carries the medium during printing; and a suction mechanism that sucks the medium placed on the platen to the platen and holds it, the platen being arranged on the upper side of the heater, and the suction mechanism includes: a plurality of air intakes arranged in the left-right direction; a suction fan that connects the plurality of air intakes via piping; and a filter that is arranged in the middle of the piping path between the plurality of air intakes and the suction fan, for the air sucked in from the plurality of air intakes to pass through, and the filter is arranged at a position that is horizontally offset from the heater.

[0034] At this point, the ink mist generated when ink is ejected from the inkjet head is sucked into the suction mechanism and adheres to the filter. There's a risk that the ink mist will solidify in the filter and become solid matter. However, because the filter is positioned horizontally offset from the heater, the solid matter won't fall onto the media passing above the heater. This prevents degradation of the media's print quality caused by solid matter solidifying in the filter. Furthermore, since the ink mist drawn in from multiple air intakes adheres to a common filter, only one filter needs to be replaced when the filter is replaced. This makes filter replacement easy.

[0035] In the present invention, for example, a printing mechanism includes an inkjet head that ejects ink onto a medium; and a platen that supports the medium during printing. The platen includes a platen body having a medium-receiving surface for receiving the medium; and a platen frame that supports the platen body from below. The platen body is formed of aluminum or an aluminum alloy, and at least the medium-receiving surface of the platen body is covered with a conductive coating. In the present invention, the coating is, for example, a plated coating. Furthermore, in the present invention, the plated coating is, for example, a nickel-plated coating.

[0036] For example, if the media loading surface of the platen is treated with alumite to improve its durability, thereby covering the media loading surface with an insulating alumite coating, when printing on a long piece of media while conveying the media, the amount of charge between the media loading surface and the media in contact increases as the media is conveyed over a longer distance. This results in a greater electrical attraction of the media toward the loading surface due to static electricity, potentially preventing accurate media conveyance. On the other hand, if the media loading surface is covered with a conductive coating, this can prevent the charge between the loading surface and the media even when the media is conveyed over a longer distance. Therefore, even when printing on a long piece of media while conveying the media, and even when the media is conveyed over a longer distance, accurate media conveyance can be achieved.

[0037] Moreover, in order to solve the above-mentioned problem, the inkjet printer of the present invention is used for printing on long strips of medium, and the inkjet printer is characterized in that it includes: an inkjet head for ejecting ink onto the medium; a platen, which is arranged on the lower side of the inkjet head and carries the medium to be printed; and a suction mechanism for sucking the medium placed on the platen onto the platen and holding it, wherein a plurality of suction holes for sucking the medium placed on the platen are formed on the upper surface of the platen, and the plurality of suction holes lead to the inner space of the platen formed into a hollow shape, and the suction mechanism includes: an exhaust fan for exhausting the air in the inner space of the platen to the inkjet head; The inkjet printer includes an exterior portion; and a flow path forming portion that forms an air flow path for air exhausted from the interior space of the platen. If the widest media among the media to be printed by the inkjet printer is defined as the maximum-width media, and the range within which the maximum-width media are arranged in the width direction of the media, which is perpendicular to the thickness direction and the longitudinal direction of the media, is defined as the media arrangement range, then an exhaust fan is mounted on the flow path forming portion. Exhaust holes are formed in the flow path forming portion to exhaust air toward the exterior of the inkjet printer via the exhaust fan. The exhaust holes are located at a position away from the media arrangement range in the width direction of the media. In this case, the maximum-width media may also be the maximum-width media that can be printed by the inkjet printer.

[0038] In the inkjet printer of the present invention, a suction mechanism for sucking media placed on a platen toward the platen and retaining the media thereon includes: an exhaust fan for exhausting air from the interior of the platen to the exterior of the inkjet printer; and a flow path forming portion for forming an air flow path through which air exhausted from the interior of the platen passes. The flow path forming portion includes exhaust holes for exhausting air toward the exterior of the inkjet printer via the exhaust fan. Furthermore, in the present invention, assuming that the widest media among the media to be printed by the inkjet printer is defined as the maximum-width media, and the range in the width direction of the media within which the maximum-width media is arranged is defined as the media arrangement range, the exhaust holes are located at a position outside the media arrangement range in the width direction of the media.

[0039] Therefore, in the present invention, when air that enters the hollow interior of the platen when the medium is drawn onto the platen is exhausted to the outside of the inkjet printer, even if solidified solids from the ink mist are exhausted from the exhaust holes along with the air, the solids can be prevented from adhering to the medium. Therefore, in the present invention, even if solidified solids from the ink mist are exhausted from the outside of the inkjet printer along with the air that enters the hollow interior of the platen when the medium is drawn onto the platen, contamination of the medium by the solids can be prevented.

[0040] In the present invention, it is preferable that the exhaust fan is arranged at the same position as the exhaust hole in the width direction of the medium. If it is configured like this, the exhaust fan can efficiently exhaust air from the exhaust hole toward the outside of the inkjet printer.

[0041] In the present invention, the inkjet printer includes, for example: a carriage equipped with an inkjet head; a carriage driving mechanism for causing the carriage to move back and forth along the width direction of the medium, i.e., the main scanning direction; and a maintenance unit for preventing the nozzles of the inkjet head from being clogged. The maintenance unit is arranged in an area away from the medium configuration range in the main scanning direction, i.e., the maintenance area. If the side where the maintenance area is arranged relative to the medium configuration range in the main scanning direction is set as the maintenance area side, the exhaust hole is arranged on the maintenance area side closer to the medium configuration range.

[0042] In the present invention, preferably, the suction mechanism includes a suction fan for sucking the medium placed on the table, the suction fan is installed on the bottom surface of the table, and the flow path forming portion includes: a hollow flow path forming frame, which is formed into a long and slender strip in the width direction of the medium and forms an air flow path inside; and a cylindrical connecting member, which connects the suction fan to the flow path forming frame, the exhaust fan is installed at one end of the flow path forming frame in the width direction of the medium, and the exhaust hole is formed at one end of the flow path forming frame in the width direction of the medium.

[0043] With this configuration, the suction mechanism includes a suction fan in addition to the exhaust fan, allowing the suction fan to reliably draw the media placed on the platen onto the platen. Furthermore, with this configuration, an exhaust hole is formed at one end of the flow path-forming frame, which is formed in a strip-shaped shape extending in the width direction of the media. This allows the exhaust hole to be positioned away from the media in the width direction of the media. Therefore, even if solidified ink mist is discharged from the exhaust hole along with air, contamination of the media by the solid matter can be effectively prevented.

[0044] In the present invention, it is preferred that the connecting member be formed from a thin film-like membrane into a cylindrical shape. With this configuration, even if the relative positional accuracy of the opening of the flow path forming frame connected to one end of the connecting member and the suction fan connected to the other end of the connecting member is increased, the flexible connecting member can easily connect the opening of the flow path forming frame and the suction fan.

[0045] In the present invention, for example, the suction mechanism includes a filter through which air exhausted from the internal space of the platen passes, and the filter is arranged at a position away from the media arrangement range in the width direction of the media.

[0046] In the present invention, preferably, a plurality of air intake holes are formed on the lower surface of the tabletop, arranged along the width of the medium. These air intake holes lead to the interior space of the tabletop and to the air flow path formed in the flow path forming portion. The exhaust fan also serves to suck the medium placed on the tabletop. This configuration eliminates the need for a separate fan for sucking the medium placed on the tabletop. Consequently, the structure of the suction mechanism can be simplified.

[0047] In the present invention, the inkjet printer includes, for example: a medium conveying mechanism for conveying the medium along the long side direction of the medium; a winding roller holding portion for holding the printed medium wound into a roll, i.e., the winding roller; a tension imparting mechanism having a tension rod, wherein the tension rod contacts the printed medium between the inkjet head and the winding roller holding portion on the moving path of the medium to impart tension to the medium; and a heater for heating the printed medium. If the direction perpendicular to the width direction and the up-down direction of the medium is defined as the front-to-back direction, the thickness direction of the medium when printing by the inkjet head is consistent with the up-down direction, and the medium printed by the inkjet head moves toward the front side and then moves toward the bottom side. The tension rod is arranged at a lower side than the table, contacts the medium moving toward the lower side from the upper rear side, and applies tension to the medium by the gravity acting on the tension rod, the heater is arranged at a lower side and rear side than the tension rod, the winding roller is arranged at a higher side and rear side than the heater, the medium passing through the tension rod then passes through the upper side of the heater and moves toward the rear side, the table is arranged at the upper side of the heater, the suction mechanism includes a filter, the filter is for air discharged from the internal space of the table through multiple suction holes, the filter is arranged at a position away from the medium configuration range in the width direction of the medium, and is arranged at a position deviated from the heater in the width direction of the medium.

[0048] In this case, the filter is positioned away from the media placement area in the media width direction and offset from the heater in the media width direction. Therefore, even if ink mist adheres to the filter and solidifies into solid matter, and the solid matter falls off, it can be prevented from adhering to the media passing above the heater. Furthermore, since ink mist exhausted from the interior of the platen through multiple air intake holes adheres to the same filter, only one filter needs to be replaced when replacing the filter. This makes filter replacement easy.

[0049] Moreover, in order to solve the above-mentioned problem, the moisturizing device of the present invention is used to moisturize the nozzle surface of the head unit having multiple inkjet heads, and the moisturizing device is characterized in that it includes: a main container, which is formed in a box shape with an open upper surface and stores moisturizing liquid for moisturizing; a sub-container, which stores moisturizing liquid and is connected to the main container; a moisturizing liquid supply unit, which is used to supply moisturizing liquid to the main container; and a liquid level detection mechanism, which is used to detect the height of the liquid level of the moisturizing liquid in the sub-container, the liquid level of the moisturizing liquid in the main container is arranged on the lower side of the nozzle surface when the inkjet head is not ejecting ink and is not printing, and the moisturizing liquid can be circulated between the main container and the sub-container, and the height of the liquid level of the moisturizing liquid in the sub-container is equal to the height of the liquid level of the moisturizing liquid in the main container. The moisturizing liquid supply unit supplies moisturizing liquid to the main container based on the detection result of the liquid level detection mechanism.

[0050] In the moisturizing device of the present invention, moisturizing liquid can be transferred between the main container and the sub-container, and the height of the liquid level of the moisturizing liquid in the sub-container is equal to the height of the liquid level of the moisturizing liquid in the main container. Therefore, in the present invention, the height of the liquid level of the moisturizing liquid in the main container can be indirectly detected by a liquid level detection mechanism for detecting the height of the liquid level of the moisturizing liquid in the sub-container. Moreover, in the present invention, the moisturizing liquid supply unit supplies moisturizing liquid to the main container based on the detection result of the liquid level detection mechanism. That is, in the present invention, the moisturizing liquid supply unit automatically supplies moisturizing liquid to the main container based on the indirect detection result of the liquid level of the moisturizing liquid in the main container. Therefore, in the present invention, the liquid level of the moisturizing liquid stored in the main container can be prevented from dropping excessively, so that the nozzle surface can be properly moisturized using the moisturizing liquid stored in the main container.

[0051] Furthermore, in the present invention, the liquid level detection mechanism detects the height of the liquid level of the moisturizing liquid in the auxiliary container. Therefore, in the present invention, for example, even if the liquid level detection mechanism includes a float floating on the moisturizing liquid, since the float floats on the moisturizing liquid in the auxiliary container, there will be no interference between the float and the nozzle surface. Therefore, in the present invention, the moisturizing of the nozzle surface will not be hindered by the influence of the float. Furthermore, in the present invention, since the float and the nozzle surface will not interfere with each other, the main container can be configured without considering the position of the float, and as a result, the degree of freedom in the configuration of the main container can be increased. Furthermore, in the present invention, there will be no damage to the nozzle surface, etc. caused by the interference between the float and the nozzle surface.

[0052] In the present invention, the moisturizing device preferably includes a moisturizing liquid discharge unit for discharging the moisturizing liquid from the main container, the moisturizing liquid discharge unit discharging the moisturizing liquid from the main container based on a detection result of the liquid level detection mechanism. With this configuration, the moisturizing liquid discharge unit automatically discharges the moisturizing liquid from the main container based on an indirect detection result of the liquid level of the moisturizing liquid in the main container, thereby preventing the moisturizing liquid from overflowing from the box-shaped main container having an open top surface.

[0053] In the present invention, for example, the liquid level detection mechanism includes: a float floating on the moisturizing liquid in the sub-tank; a detection object attached to the float; and a sensor disposed outside the sub-tank and detecting the detection object.

[0054] In the present invention, the moisturizing device preferably includes a sealing member capable of contacting the outer peripheral end portion of the nozzle face from below, the outer shape of the nozzle face being larger than that of the main container, and the sealing member being disposed on the outer peripheral side of the main container. With this configuration, even if the main container is placed in a windy location, for example, the sealing member can prevent wind from flowing into the underside of the nozzle face through the gap between the upper end of the main container and the nozzle face, thereby suppressing a decrease in humidity on the underside of the nozzle face. Therefore, even if the main container is placed in a windy location, drying of the nozzle face caused by wind around the main container can be suppressed.

[0055] In the present invention, for example, the outer shape of the nozzle face is rectangular, and the sealing component is positioned on at least three sides of the rectangular nozzle face so as to contact the outer peripheral end portion of the nozzle face. When the sealing component is positioned on three sides of the nozzle face so as to contact the outer peripheral end portion of the nozzle face, even if wind flows into the lower side of the nozzle face from the gap between the upper end of the main container and the nozzle face on the side of the nozzle face where the sealing component is not positioned, the inflowing wind can be prevented from blowing over the lower side of the nozzle face. Therefore, even if the main container is placed in a place where wind flows, the humidity drop on the lower side of the nozzle face caused by the wind around the main container can be effectively suppressed. As a result, the drying of the nozzle face caused by the wind around the main container can be effectively suppressed. Moreover, in this case, compared with the case where the sealing component is positioned on four sides of the nozzle face so as to contact the outer peripheral end portion of the nozzle face, the structure of the moisturizing device can be simplified.

[0056] Furthermore, compared to a case where the sealing member is positioned on all four sides of the nozzle face so as to contact the outer peripheral edge of the nozzle face, the sealing member can prevent wind from flowing into the lower side of the nozzle face through the gap between the upper end of the main container and the nozzle face. Therefore, even if the main container is installed in a windy location, a decrease in humidity on the lower side of the nozzle face caused by wind around the main container can be prevented. Consequently, drying of the nozzle face caused by wind around the main container can be prevented.

[0057] In the present invention, it is preferable that a seal holding portion for holding the seal member is formed at the upper end portion of the main container. With this configuration, the seal member can be arranged on the outer peripheral side of the main container with a relatively simple structure.

[0058] In the present invention, the moisturizing device may include a cover member disposed so as to surround the upper end of the main container, with the sealing member being fixed to the upper surface of the cover member. Furthermore, the moisturizing device may include a second sealing member that closes the gap formed between the upper end of the main container and the cover member. In this case, even if a gap is formed between the upper end of the main container and the cover member, wind can be prevented from flowing through the gap between the main container and the cover member and into the lower side of the nozzle surface.

[0059] The moisturizing device of the present invention can be used in an inkjet printer comprising: a head unit having a plurality of inkjet heads; a carriage carrying the head unit; and a carriage drive mechanism for moving the carriage in a main scanning direction. In the inkjet printer, a main tank is positioned away from a printing area in the main scanning direction, where the inkjet heads print on a medium. In this inkjet printer, the moisturizing liquid level in the main tank can be prevented from excessively dropping, allowing the nozzle surface to be properly moisturized using the moisturizing liquid in the main tank.

[0060] Effects of the Invention

[0061] As described above, in the present invention, in a printer including a printing mechanism for printing on a long medium, a winding roller holding portion for holding a winding roller that is a printed medium wound into a roll, and a tension rod that contacts the printed medium between the printing mechanism and the winding roller holding portion to apply tension to the medium, even if the tension rod is movable toward the front and lower direction and contacts the printed medium moving toward the lower side from the upper rear side, and tension is applied to the medium by the gravity acting on the tension rod, changes in the tension of the medium applied by the tension rod when the position of the tension rod changes can be suppressed.

[0062] Moreover, as described above, in the present invention, in an inkjet printer for printing on long strips of media, even if the solidified solid matter of the ink mist is discharged toward the outside of the inkjet printer together with the air that enters the hollow interior of the platen when the media is sucked onto the platen, contamination of the media due to the solid matter can be prevented.

[0063] Moreover, as described above, in the present invention, in a moisturizing device for moisturizing the nozzle surface of a head unit having multiple inkjet heads, it is possible to prevent the liquid level of the moisturizing liquid stored in the main container from dropping excessively, so that the nozzle surface can be properly moisturized using the moisturizing liquid stored in the main container. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] [ Figure 1 ] is a side view for illustrating the structure of a printer according to an embodiment of the present invention.

[0065] [ Figure 2 ] is used to illustrate Figure 1 A block diagram of the structure of the printer is shown.

[0066] [ Figure 3 ] is used to illustrate Figure 1 A schematic diagram showing the structure of a suction mechanism included in the printing mechanism shown.

[0067] [ Figure 4 ] is used to illustrate Figure 1A perspective view showing the structure of the right side portion of the tension applying mechanism.

[0068] [ Figure 5 ] is used to illustrate Figure 1 A perspective view showing the structure of the right side portion of the tension applying mechanism.

[0069] [ Figure 6 ] is used to illustrate Figure 1 A perspective view showing the structure of the left side portion of the tension applying mechanism.

[0070] [ Figure 7 ] is used to illustrate Figure 1 Graph showing an example of the relationship between the position of the tension rod and the tension applied to the medium by the tension rod.

[0071] [ Figure 8 ](A)~(I) are used for explanation Figure 4 The figure (J) is used to illustrate the arrangement position of the sensor relative to the linear scale when the linear scale moves. Figure 4 The table shows the detection status of the movement amount of the linear scale.

[0072] [ Figure 9 ] is used to illustrate Figure 1 A side view of the structure of the deck is shown.

[0073] [ Figure 10 ] is used to illustrate Figure 9 A table of experimental results showing the effect of the platen.

[0074] [ Figure 11 ] is a side view for illustrating the structure of a printer according to another embodiment of the present invention.

[0075] [ Figure 12 ] is a side view for illustrating the structure of an inkjet printer according to an embodiment of the present invention.

[0076] [ Figure 13 ] is used to illustrate Figure 12 A schematic diagram of the structure of the printing mechanism shown.

[0077] [ Figure 14 ] is from the lower back side Figure 12 A three-dimensional view of the suction mechanism, etc. shown.

[0078] [ Figure 15 (A) Yes Figure 12 The plan view of the table and the suction mechanism shown, (B) is Figure 12 Front view of the table and suction mechanism shown.

[0079] [ Figure 16 ] is used to illustrate Figure 12 A cross-sectional view of the structure of the table and the suction mechanism is shown.

[0080] [ Figure 17 ] is a side view for illustrating the structure of an inkjet printer according to another embodiment of the present invention.

[0081] [ Figure 18 ] is used to illustrate Figure 17 A schematic diagram showing the structure of a suction mechanism included in the printing mechanism shown.

[0082] [ Figure 19 ] is a schematic diagram for illustrating the structure of an inkjet printer according to an embodiment of the present invention.

[0083] [ Figure 20 ]yes Figure 19 The bottom view of the head unit is shown.

[0084] [ Figure 21 ] is a schematic diagram for illustrating the structure of a moisturizing device according to an embodiment of the present invention.

[0085] [ Figure 22 ] is used to illustrate Figure 3 A block diagram of the structure of the moisturizing device is shown.

[0086] [ Figure 23 ](A) is used to illustrate Figure 21 The structure of the main container shown is a plan view, and (B) is a cross-sectional view taken along line EE of (A).

[0087] [ Figure 24 ](A) is a plan view for illustrating the structure of a main container, etc. according to another embodiment of the present invention, (B) is a cross-sectional view of the FF section of (A), (C) is a cross-sectional view of the GG section of (A), and (D) is a cross-sectional view of the HH section of (A).

[0088] [ Figure 25 ](A) is a plan view for illustrating the structure of a main container, etc. according to another embodiment of the present invention, and (B) is a cross-sectional view taken along the JJ section of (A). DETAILED DESCRIPTION

[0089] <First embodiment>

[0090] Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.

[0091] (Overall structure of the printer)

[0092] Figure 1 It is a side view for explaining the structure of the printer 1 according to the embodiment of the present invention. Figure 2 Is used to illustrate Figure 1FIG. 1 is a block diagram showing the structure of the printer 1. Figure 3 Is used to illustrate Figure 1 The diagram schematically shows the structure of the suction mechanism 21 included in the printing mechanism 3.

[0093] This embodiment of the printer 1 is, for example, an office inkjet printer. The printer 1 includes a printing mechanism 3 for printing on a long medium 2 (sheet-like medium 2), such as paper; a medium transport mechanism 4 for transporting the medium 2; a payout roller holder 6 for holding a roll of the pre-printed medium 2, i.e., a payout roller 5; a wind-up roller holder 8 for holding a roll of the printed medium 2, i.e., a wind-up roller 7; a plurality of guide rollers 9 for guiding the transported medium 2; and a heater 10 for heating the printed medium 2. In this embodiment, the medium 2 is, for example, transfer paper. The length of the medium 2 is, for example, 2000 m.

[0094] Furthermore, the printer 1 includes: a tension applying mechanism 11 for applying tension to the medium 2 before printing; a tension applying mechanism 12 for applying tension to the medium 2 after printing; and a control unit 13 for controlling the printer 1. Figure 1 The Y direction of the medium 2 is defined as the "horizontal direction", and the width direction of the medium 2 is consistent with the horizontal direction. In the following description, the vertical direction and the horizontal direction are perpendicular to each other. Figure 1 The X direction is set as the "front-back direction". And, one side of the front-back direction is Figure 1 The X1 direction side is set as the "front" side, and the opposite side is Figure 1 The X2 direction side is set as the "rear" side.

[0095] The printing mechanism 3 includes: an inkjet head 17 (hereinafter referred to as "head 17"), which ejects ink onto the medium 2; a carriage 18, which carries the head 17; a carriage drive mechanism, which reciprocates the carriage 18 along the width direction of the medium 2, i.e., the main scanning direction (i.e., the left-right direction); and a support frame (Y-rod) 19, which supports the carriage 18 so that it can move in the left-right direction. The head 17 ejects ink downward. A plurality of nozzles for ejecting ink are formed on the lower surface of the head 17. The head 17 includes a piezoelectric element for ejecting ink from the nozzles. The carriage drive mechanism includes, for example, a belt partially fixed to the carriage 18, a pulley on which the belt is mounted, and a motor for rotating the pulley.

[0096] Furthermore, the printing mechanism 3 includes: a platen 20 on which the medium 2 is placed during printing; and a suction mechanism 21 for sucking the medium 2 placed on the platen 20 to the platen 20 and holding it. The platen 20 is arranged on the lower side of the carriage 18. The platen 20 is formed into a long strip that is slender in the left-right direction. Furthermore, the platen 20 is formed into a hollow shape. A plurality of suction holes for sucking the medium 2 placed on the platen 20 are formed on the upper surface portion of the platen 20. The suction holes are formed in plurality over substantially the entire area of ​​the platen 20. The thickness direction of the medium 2 when printing is performed using the printing mechanism 3 coincides with the up-down direction. The upper surface of the medium 2 when placed on the platen 20 becomes the printing surface for printing by the printing mechanism 3. A more specific structure of the platen 20 will be described later.

[0097] like Figure 3 As shown, the suction mechanism 21 includes: a plurality of air intake ports 23 arranged in a horizontal direction; a suction fan 25 connected to the plurality of air intake ports 23 via a pipe 24; and a filter 26 disposed midway along the pipe path between the plurality of air intake ports 23 and the suction fan 25. The air intake ports 23 lead into the interior of the hollow platen 20. A plurality of air intake ports 23 are arranged at predetermined intervals in the horizontal direction. Furthermore, the air intake ports 23 are disposed throughout the entire area of ​​the platen 20 in the horizontal direction.

[0098] The suction mechanism 21 of this embodiment includes a suction fan 25 and a filter 26. When the suction fan 25 is operating, it draws air from the interior of the platen 20 through all of the multiple air inlets 23. Specifically, when the suction fan 25 is driven, the air inside the platen 20 is exhausted. As the air inside the platen 20 is exhausted, the medium 2 is drawn into the suction holes of the platen 20, where it is held by the platen 20. Furthermore, when the suction fan 25 is operating, the air drawn from all of the multiple air inlets 23 passes through the filter 26.

[0099] The medium conveying mechanism 4 conveys the long medium 2 along its longitudinal direction. The medium conveying mechanism 4 includes a conveying roller 27 that contacts the medium 2 and conveys the medium 2. The conveying roller 27 is a rubber roller with a rubber surface. The conveying roller 27 is connected to a drive mechanism that rotates the conveying roller 27. The drive mechanism includes a motor as a drive source and a power transmission mechanism that transmits the power of the motor to the conveying roller 27. The conveying roller 27 is arranged on the rear side of the platen 20. The medium 2 before printing is conveyed from the rear side to the upper surface of the platen 20. Moreover, the printed medium 2 is conveyed from the upper surface of the platen 20 toward the front side and then toward the bottom side. That is, the medium 2 printed by the printing mechanism 3 moves toward the front side and then toward the bottom side. In this embodiment, the conveying speed of the medium 2 is relatively fast. For example, the maximum conveying speed of the medium 2 is 350 (mm / second).

[0100] The feed roller holder 6 is arranged below the platen 20. Furthermore, the feed roller holder 6 is arranged behind the printing mechanism 3. The feed roller 5 is arranged so that the axial direction of the feed roller 5 coincides with the left-right direction. The feed roller holder 6 includes a rotating shaft 29 inserted into the inner circumference of the feed roller 5 and a drive mechanism for rotating the rotating shaft 29. The drive mechanism includes a motor 30 serving as a drive source and a power transmission mechanism for transmitting power from the motor 30 to the rotating shaft 29.

[0101] The motor 30 is controlled by a proportional-integral-derivative (PID) system. A rotary encoder is mounted on the motor 30 to detect the amount of rotation or rotational speed of the motor 30. The rotary encoder includes a circular rotary scale (slit plate) fixed to the rotating shaft of the motor 30, and a sensor 31 for detecting the rotary scale. The sensor 31 is a transmissive optical sensor having a light-emitting portion and a light-receiving portion, with a portion of the rotary scale disposed between the light-emitting portion and the light-receiving portion. The sensor 31 is electrically connected to the control unit 13.

[0102] The winding roller retaining unit 8 is positioned below the pay-out roller retaining unit 6 and further to the rear of the printing mechanism 3. The winding roller 7 is positioned so that its axial direction coincides with the left-right direction. The winding roller retaining unit 8 includes a rotating shaft 32 inserted into the inner circumference of the winding roller 7 and a drive mechanism for rotating the rotating shaft 32. The drive mechanism includes a motor 33 serving as a drive source and a power transmission mechanism for transmitting power from the motor 33 to the rotating shaft 32.

[0103] Motor 33 is PID-controlled. A rotary encoder is mounted on motor 33 to detect the amount of rotation or speed of rotation. The rotary encoder consists of a disc-shaped rotary scale fixed to the rotating shaft of motor 33 and a sensor 34 for detecting the rotary scale. Sensor 34 is a transmissive optical sensor with a light-emitting portion and a light-receiving portion, with a portion of the rotary scale positioned between the light-emitting and light-receiving portions. Sensor 34 is electrically connected to control unit 13.

[0104] The tension-applying mechanism 11 includes a tension rod 37 that contacts the pre-printed medium 2 between the printing mechanism 3 and the delivery roller holder 6 to apply tension to the medium 2, and a guide that linearly guides the tension rod 37 in the vertical direction. The tension rod 37 is arranged so that its axial direction coincides with the left-right direction. The tension rod 37 is positioned between the printing mechanism 3 and the delivery roller 5 in the front-to-back direction. Furthermore, the tension rod 37 is positioned below the printing mechanism 3 and the delivery roller 5. The tension rod 37 contacts the medium 2 from above as it moves forward from the delivery roller holder 6 toward the printing mechanism 3. The tension rod 37 applies tension to the medium 2 due to the force of gravity acting on the tension rod 37. During printing of the medium 2, the tension rod 37 linearly moves in the vertical direction in response to the movement of the medium 2.

[0105] The tension-applying mechanism 11 also includes a linear encoder for detecting the position of the tension rod 37. The linear encoder includes a linear scale that moves vertically along with the tension rod 37, and two sensors 38 and 39 for detecting the linear scale. Sensors 38 and 39 are arranged vertically at a predetermined distance. Sensors 38 and 39 are transmissive optical sensors having a light-emitting portion and a light-receiving portion, with a portion of the linear scale positioned between the light-emitting and light-receiving portions. Sensors 38 and 39 are electrically connected to the control unit 13.

[0106] The tension applying mechanism 12 includes a tension rod 40, which contacts the printed medium 2 between the printing mechanism 3 and the winding roller holding portion 8 to apply tension to the medium 2. The tension rod 40 is arranged so that the axial direction of the tension rod 40 coincides with the left-right direction. The tension rod 40 is arranged further forward and below the printing mechanism 3. Figure 1 As shown by the arrow, the tension rod 40 is linearly movable in a forward and downward direction. The tension rod 40 contacts the printed medium 2 from the upper and rear sides, as it moves forward from the platen 20 and then downward. The tension rod 40 applies tension to the medium 2 by the force of gravity acting on the tension rod 40. The detailed structure of the tension applying mechanism 12 will be described later.

[0107] The heater 10 is positioned below the printing mechanism 3, and the platen 20 is positioned above the heater 10. The heater 10 is positioned below the tension rod 37. Furthermore, the heater 10 is positioned below and behind the tension rod 40. Furthermore, the heater 10 is positioned below and in front of the pay-out roller 5 and the winding roller 7. In other words, the pay-out roller 5 and the winding roller 7 are positioned above and behind the heater 10. The filter 26 is positioned horizontally offset from the heater 10.

[0108] As described above, the printed medium 2 by the printing mechanism 3 moves forward and then downward. The media 2 moving downward then moves rearward. The media 2 moving rearward passes above the heater 10. Furthermore, as described above, the tension bar 40 contacts the printed medium 2 from the upper rear side, after it moves forward from the platen 20 and then downward. That is, after passing the tension bar 40, the media 2 moves rearward by passing above the heater 10.

[0109] The plurality of guide rollers 9 are driven rollers that rotate as the medium 2 moves. Two of the plurality of guide rollers 9 are arranged on either side of the tension rod 37 in the front-to-back direction and are positioned above the tension rod 37. Furthermore, one of the plurality of guide rollers 9 is positioned in front of the platen 20 and functions to change the direction of movement of the medium 2 moving forward from the platen 20 to a downward direction.

[0110] Furthermore, one of the multiple guide rollers 9 is positioned below the tension bar 40 and on the front side of the printer 1, functioning to redirect the downwardly moving medium 2 to the rear. Furthermore, two of the multiple guide rollers 9 are positioned below the tension bar 40 and positioned between the heater 10 and the winding roller 7 in the front-to-back direction. The front guide roller 9 contacts the bottom surface of the medium 2, while the rear guide roller 9 contacts the top surface of the medium 2.

[0111] (Structure of the tension applying mechanism)

[0112] Figure 4 、 Figure 5 Is used to illustrate Figure 1 The structure of the right side portion of the tension applying mechanism 12 is shown in a perspective view. Figure 6 Is used to illustrate Figure 1 The diagram is a perspective view of the structure of the left side portion of the tension applying mechanism 12 shown. Figure 7 Is used to illustrate Figure 1 Graph showing an example of the relationship between the position of the tension rod 40 and the tension applied to the medium 2 by the tension rod 40 . Figure 8 (A) to (I) are used for explanation Figure 4 FIG. 4 is a diagram showing the arrangement positions of the sensors 50 and 51 relative to the linear scale 49 when the linear scale 49 moves. Figure 8 (H) is used to illustrate the pair of sensors 50 and 51. Figure 4 A table showing the detection status of the movement amount of the linear scale 49 is shown.

[0113] The tensioning mechanism 12 includes a guide portion 43 that linearly guides the tension rod 40 in a forward and downward direction, and a biasing member 44 that biases the tension rod 40 diagonally upward and rearward. In this embodiment, the biasing member 44 is a tension coil spring. Therefore, in the following description, the biasing member 44 will be referred to as the "tension coil spring 44." In this embodiment, the tensioning mechanism 12 includes two guide portions 43 and two tension coil springs 44.

[0114] The tensioning mechanism 12 further includes two bearings 45 mounted on the tension rod 40; two sliders 46 formed independently of the tension rod 40 and capable of linear movement in the same direction as the movement of the tension rod 40; two guide plates 47 for guiding the sliders 46; and a linear encoder 48 for detecting the position of the tension rod 40. The linear encoder 48 includes a linear scale 49 that moves vertically along with the tension rod 40, and two sensors 50 and 51 for detecting the position of the linear scale 49.

[0115] The tension rod 40 includes a shaft portion 53 formed into an elongated cylindrical shape and a cylindrical rod body 54, through which the shaft portion 53 is inserted. The shaft portion 53 is arranged so that its axial direction aligns with the left-right direction. The rod body 54 is formed into a thick-walled cylindrical shape that is elongated in the left-right direction. The rod body 54 contacts the medium 2. The shaft portion 53 is longer than the rod body 54, with both ends of the shaft portion 53 positioned further outward in the left-right direction than the ends of the rod body 54. The bearings 45 are, for example, roller bearings. The bearings 45 are mounted on the left-right end portions of the shaft portion 53 that protrude further outward in the left-right direction than the ends of the rod body 54.

[0116] One of the two guide sections 43 guides the right end of the tension rod 40, while the other guide section 43 guides the left end of the tension rod 40. The guide section 43 includes two guide members 55 arranged to sandwich the bearing 45. The guide members 55 are fixed to a frame 57, which is fixed to the main frame of the printer 1. One of the two guide members 55 has a flat contact surface that contacts the bearing 45 from the oblique rear lower side, while the other guide member 55 has a flat contact surface that contacts the bearing 45 from the oblique front upper side.

[0117] The contact surface of the bearing 45 formed on one guide member 55 is parallel to the contact surface of the bearing 45 formed on the other guide member 55. When the medium 2 is printed, the tension rod 40 moves linearly between the two guide members 55 according to the movement of the medium 2 (see Figure 4 The solid line, Figure 5 The solid line and Figure 6 At this time, the bearing 45 rotates relative to the guide member 55.

[0118] The slope θ of the moving direction of the tension rod 40 with respect to the front-rear direction when viewed from the left-right direction (see Figure 1 ) is 30° to 60°. That is, the guide portion 43 guides the tension rod 40 in a direction inclined by 30° to 60° relative to the front-rear direction when viewed from the left-right direction. In this embodiment, the slope θ is 45°, and the guide portion 43 guides the tension rod 40 in a direction inclined by 45° relative to the front-rear direction when viewed from the left-right direction.

[0119] The upper side of the guide portion 43 serves as a tension rod support portion 56 that supports the tension rod 40 when it is separated from the guide portion 43. Specifically, the tension applying mechanism 12 includes the tension rod support portion 56, which is disposed on the upper side of the guide portion 43 and supports the tension rod 40 when it is separated from the guide portion 43. The tension rod support portion 56 includes a support member that supports both left and right end portions of the shaft portion 53, which is disposed on the left and right outer sides of the bearing 45, from the oblique front lower side.

[0120] When the medium 2 is set in the printer 1, the tension bar 40 is arranged above the guide portion 43 and away from the guide portion 43, and is supported by the tension bar support portion 56 (see FIG. Figures 4 to 6 When the tension rod 40 is supported by the tension rod support portion 56, the tension rod 40 is positioned so as not to contact the medium 2. The tension rod 40 is manually moved toward and away from the guide portion 43.

[0121] One of the two sliders 46 contacts the right end of the tension rod 40 from the oblique front lower side, and the other slider 46 contacts the left end of the tension rod 40 from the oblique front lower side. The slider 46 contacts the left and right ends of the shaft portion 53 arranged on the left and right outer sides of the bearing 45. A slit-shaped guide groove 47a is formed in the guide plate 47 to guide the slider 46. A portion of the slider 46 is arranged in the guide groove 47a. The guide plate 47 is fixed to the frame 57. The guide plate 47 is arranged on the oblique front upper side of the bearing 45. In addition, when the tension rod 40 is supported by the tension rod support portion 56, the slider 46 does not contact the tension rod 40 and is away from the tension rod 40.

[0122] One end of one of the two tension coil springs 44 is engaged with the slider 46 in contact with the right end of the tension rod 40, and the other end of the tension coil spring 44 is engaged with the spring retaining member 58 fixed to the upper end of the guide plate 47. One end of the other tension coil spring 44 is engaged with the slider 46 in contact with the left end of the tension rod 40, and the other end of the tension coil spring 44 is engaged with the spring retaining member 58 fixed to the upper end of the guide plate 47.

[0123] The tension coil spring 44 urges the slider 46 toward the upper and rearward sides. Specifically, the tension coil spring 44 urges the tension rod 40 toward the upper and rearward sides via the slider 46, which contacts the tension rod 40 from the lower and frontward sides. Furthermore, one of the two tension coil springs 44 urges the right end of the tension rod 40, while the other urges the left end of the tension rod 40. The urging force of the tension coil springs 44 increases as the tension rod 40 moves toward the lower and frontward sides, and decreases as the tension rod 40 moves toward the upper and rearward sides.

[0124] When the tension rod 40 moves diagonally forward and downward, the slider 46 is pushed by the tension rod 40 and moves diagonally forward and downward together with the tension rod 40. When the tension rod 40 moves diagonally backward and upward, the slider 46 moves diagonally backward and upward due to the force applied by the tension coil spring 44. At this time, the slider 46 moves diagonally backward and upward together with the tension rod 40 while maintaining contact with the tension rod 40 from the diagonally forward and downward due to the force applied by the tension coil spring 44.

[0125] As described above, in this embodiment, the tension rod 40 contacts the printed medium 2 moving downward from the upper and rear side, and the weight acting on the tension rod 40 applies tension to the medium 2. Therefore, if the center angle of the arc-shaped contact portion of the outer peripheral surface of the tension rod 40 that contacts the medium 2 when viewed from the left and right direction is defined as the medium contact angle, then in this embodiment, the medium contact angle varies depending on the position of the tension rod 40 (see Figure 1 solid line and two-point chain line).

[0126] Therefore, in the case where the tension imparting mechanism 12 does not include the tension coil spring 44, the tension imparted to the medium 2 by the tension rod 40 is as follows: Figure 7 As shown by the straight line L1, the media contact angle varies significantly depending on the position of the tension rod 40. Specifically, as the tension rod 40 moves diagonally toward the front and lower side, the media contact angle increases, while as the tension rod 40 moves diagonally toward the rear and upper side, the media contact angle decreases. Therefore, the distance the tension rod 40 moves from the lower limit position increases, and the tension on the media 2 decreases. In other words, as the tension rod 40 approaches the lower limit position, the tension on the media 2 increases.

[0127] In contrast, in this embodiment, the tension-applying mechanism 12 includes a tension coil spring 44 for urging the tension rod 40 toward the upper and rearward sides. The urging force of the tension coil spring 44 increases as the tension rod 40 approaches its lower limit position. Specifically, even though the media contact angle increases as the tension rod 40 moves toward the lower and frontward sides, the urging force of the tension coil spring 44 on the tension rod 40, which decreases the tension applied to the media 2 by the tension rod 40, continues to increase as the tension rod 40 moves toward the lower and frontward sides. Furthermore, even though the media contact angle decreases as the tension rod 40 moves toward the upper and rearward sides, the urging force of the tension coil spring 44 on the tension rod 40, which decreases the tension applied to the media 2 by the tension rod 40, continues to decrease as the tension rod 40 moves toward the upper and rearward sides.

[0128] Furthermore, in this embodiment, the spring force and spring constant of the tension coil spring 44 are set so as to suppress the tension variation of the medium 2 caused by the position of the tension rod 40. Figure 7 As shown by the curve L2, regardless of the distance the tension rod 40 moves from the lower limit position, fluctuations in the tension of the medium 2 are suppressed. Furthermore, regardless of the position of the tension rod 40, tension is always applied to the medium 2 by the tension rod 40. In other words, the tension rod 40 does not move diagonally upward and rearward simply by the force of the two tension coil springs 44.

[0129] The linear scale 49 is fixed to one of the two sliders 46. In this embodiment, the linear scale 49 is fixed to the slider 46 that contacts the right end of the tension rod 40 from the oblique front lower side. The sensors 50 and 51 are transmissive optical sensors having a light-emitting portion and a light-receiving portion, and the light-emitting portion and the light-receiving portion are arranged facing each other with a gap in the left-right direction. The sensors 50 and 51 are arranged with a predetermined gap in the long side direction of the linear scale 49. In addition, the sensors 50 and 51 are mounted on the frame 57. A portion of the linear scale 49 is arranged between the light-emitting portion and the light-receiving portion of the sensors 50 and 51. The sensors 50 and 51 are electrically connected to the control unit 13.

[0130] The longitudinal direction of the linear scale 49 aligns with the direction of movement of the tension rod 40 and slider 46. Through-holes are formed at regular intervals through the linear scale 49. These through-holes form light-passing portions 49a, which allow light from the light-emitting units of the sensors 50 and 51 to pass toward the light-receiving units. The portion between the through-holes along the longitudinal direction of the linear scale 49 forms light-shielding portions 49b, which block light from the light-emitting units of the sensors 50 and 51 toward the light-receiving units. The width of the light-passing portions 49a along the longitudinal direction of the linear scale 49 is equal to the width of the light-shielding portions 49b.

[0131] In this embodiment, the detection width of the sensors 50 and 51 in the longitudinal direction of the linear scale 49 is 1 / 4 of the width of the light-passing portion 49a in the longitudinal direction of the linear scale 49. Furthermore, the distance between the sensors 50 and 51 in the longitudinal direction of the linear scale 49 is, for example, 14 mm. In this embodiment, the arrangement relationship between the linear scale 49 and the sensors 50 and 51 is as follows: Figure 8 (A) to (I) change sequentially.

[0132] Therefore, every time the linear scale 49, the tension rod 40 and the slider 46 move 1 (mm), the detection status of the sensors 50 and 51 is as follows: Figure 8 (J) changes as shown. In this form, Figure 8 As shown in (J), the resolution of the movement of the tension rod 40 detected by the linear encoder 48 is 2 (mm). Figure 8 “Sensor A” in (J) is sensor 50 , and “Sensor B” is sensor 51 .

[0133] (Media release control and media winding control)

[0134] In the feed roller holding unit 6, the medium 2 is fed out based on the detection results of the sensors 38 and 39. Specifically, the control unit 13 controls the motor 30 based on the detection results of the sensors 38 and 39. Specifically, the control unit 13 controls the motor 30 based on the detection results of the sensors 38 and 39 so that the tension rod 37, which moves as the medium transport mechanism 4 transports the medium 2, returns to its original position. Furthermore, the control unit 13 calculates the outer diameter of the feed roller 5 based on the detection results of the sensors 38 and 39 and the detection result of the sensor 31 (specifically, based on the movement of the tension rod 37 and the rotation amount of the motor 30), and controls the motor 30 based on the calculated outer diameter of the feed roller 5. Specifically, when feeding out a certain amount of medium 2, the control unit 13 increases the rotation amount of the motor 30 as the outer diameter of the feed roller 5 decreases.

[0135] In the winding roller holding unit 8, the medium 2 is wound based on the detection results of the sensors 50 and 51. Specifically, the control unit 13 controls the motor 33 based on the detection results of the sensors 50 and 51. Specifically, the control unit 13 controls the motor 33 based on the detection results of the sensors 50 and 51 so that the tension rod 40, which moves as the medium 2 is conveyed by the medium conveying mechanism 4, returns to its original position. Furthermore, the control unit 13 calculates the outer diameter of the winding roller 7 based on the detection results of the sensors 50 and 51 and the detection result of the sensor 34 (specifically, based on the movement of the tension rod 40 and the rotation amount of the motor 33), and controls the motor 33 based on the calculated outer diameter of the winding roller 7. Specifically, when winding a certain amount of medium 2, the control unit 13 reduces the rotation amount of the motor 33 as the outer diameter of the winding roller 7 increases.

[0136] (Structure of the tabletop)

[0137] Figure 9 Is used to illustrate Figure 1 A side view of the structure of the table 20 is shown.

[0138] The platen 20 includes a platen body 61 having a medium loading surface 61a for loading the medium 2, and a platen frame 62 supporting the platen body 61 from below. The platen frame 62 is formed into a square groove (a rectangular groove) elongated in the left-right direction. The platen frame 62 is formed by bending a thin metal plate such as steel into the groove shape. The top surface of the platen frame 62 is open.

[0139] The platen body 61 is formed into a long, narrow strip extending in the horizontal direction. It forms the upper end of the platen 20. The platen body 61 is fixed to the platen frame 62 so as to block the opening on the upper surface of the platen frame 62. The platen body 61 is provided with a plurality of suction holes for suctioning the medium 2 placed on the platen 20. These suction holes extend vertically through the platen body 61. The upper surface of the platen body 61 serves as the medium loading surface 61a.

[0140] The platen body 61 is formed from aluminum or an aluminum alloy. Furthermore, the platen body 61 is formed by extrusion. At least the medium-carrying surface 61a of the platen body 61 is covered with a conductive coating. In this embodiment, the entire surface of the platen body 61 is covered with a conductive coating. The coating in this embodiment is a plated coating (plated layer). Specifically, the plated coating is a nickel-plated coating (nickel-plated layer) formed by electroless plating.

[0141] The hardness of the platen coating covering the surface of the platen body 61 is higher than the hardness of the platen body 61 excluding the platen coating. For example, the platen coating has a Vickers hardness of HV550, while the hardness of the platen body 61 excluding the platen coating is HV60. Therefore, the durability of the medium loading surface 61a is enhanced. Furthermore, the left and right ends of the platen body 61 are fixed to a metal frame (not shown). The platen body 61 is grounded via the frame, etc. In other words, the medium loading surface 61a is grounded.

[0142] (Main effect of this form)

[0143] As described above, in this form, even if the medium contact angle increases as the tension rod 40 moves toward the oblique front and lower side, the force applied by the tension coil spring 44 to the tension rod 40 in the direction in which the tension of the medium 2 imparted by the tension rod 40 decreases as the tension rod 40 moves toward the oblique front and lower side still increases. Even if the medium contact angle decreases as the tension rod 40 moves toward the oblique rear and upper side, the force applied by the tension coil spring 44 to the tension rod 40 in the direction in which the tension of the medium 2 imparted by the tension rod 40 decreases as the tension rod 40 moves toward the oblique rear and upper side.

[0144] Therefore, in this form, even if the tension rod 40 is movable toward the front and lower direction, and the tension rod 40 is brought into contact with the printed medium 2 moving toward the lower side from the upper rear side, and tension is applied to the medium 2 by the gravity acting on the tension rod 40, changes in the tension of the medium 2 applied by the tension rod 40 when the position of the tension rod 40 changes can be suppressed.

[0145] In this embodiment, one of the two tension coil springs 44 applies force to the right end of the tension rod 40, while the other tension coil spring 44 applies force to the left end of the tension rod 40. Therefore, in this embodiment, the two tension coil springs 44 can be used to apply force to the tension rod 40 in a well-balanced manner. Consequently, in this embodiment, fluctuations in the tension applied to the medium 2 by the tension rod 40 when the position of the tension rod 40 changes can be effectively suppressed.

[0146] In this embodiment, the tension coil spring 44 is engaged with a slider 46 formed independently of the tension rod 40. Therefore, in this embodiment, when setting the medium 2 in the printer 1, even if the tension rod 40 is moved to a position where it is supported by the tension rod support portion 56 (that is, even if the tension rod 40 is moved to a position above the guide portion 43 and away from the guide portion 43), the slider 46 does not need to be moved away from the guide groove 47a. Therefore, in this embodiment, when setting the medium 2 in the printer 1, there is no need to disengage the slider 46 from the tension coil spring 44 or reengage the slider 46 from the tension coil spring 44. As a result, in this embodiment, the operation of setting the medium 2 in the printer 1 can be simplified.

[0147] In this embodiment, the linear scale 49 is fixed to the slider 46 used to apply force to the tension rod 40 in order to contact the tension rod 40. Therefore, in this embodiment, there is no need to provide a separate component for fixing the linear scale 49. Therefore, in this embodiment, the structure of the tension applying mechanism 12 can be simplified. Moreover, in this embodiment, the linear scale 49 is fixed to the slider 46 formed independently of the tension rod 40. Therefore, when the medium 2 is set in the printer 1, even if the tension rod 40 is moved to a position where the tension rod 40 is supported by the tension rod support portion 56, it is not necessary to move the linear scale 49 to a position where a portion of the linear scale 49 is separated from the light emitting portion and the light receiving portion of the sensors 50 and 51. Therefore, in this embodiment, the operation of setting the medium 2 in the printer 1 can be simplified.

[0148] In this embodiment, the ink mist generated when ink is ejected from the head 17 is sucked by the suction mechanism 21 and adheres to the filter 26. Furthermore, there is a risk that the ink mist will solidify in the filter 26 and become solid matter. However, in this embodiment, the filter 26 is positioned horizontally offset from the heater 10. Therefore, in this embodiment, the solid matter does not fall onto the medium 2 passing above the heater 10. Therefore, in this embodiment, a decrease in the printing quality of the medium 2 caused by solid matter solidifying in the filter 26 can be prevented. Furthermore, in this embodiment, the ink mist sucked in from the multiple air intakes 23 adheres to the common filter 26. Therefore, when replacing the filter 26, only the common filter 26 needs to be replaced. Therefore, in this embodiment, the replacement operation of the filter 26 can be easily performed.

[0149] In this embodiment, the medium loading surface 61a is covered with a conductive plated film. Furthermore, in this embodiment, the medium loading surface 61a is grounded. Therefore, in this embodiment, even if the transport distance (feed amount) of the long medium 2 transported along the medium loading surface 61a increases, it is possible to prevent the medium 2 from being electrically charged between the medium loading surface 61a and the medium 2 in contact with the medium 2. Therefore, in this embodiment, even when printing is being performed on the long medium 2 while the medium 2 is being transported, and even if the transport distance of the medium 2 is long, the transport roller 27 can still transport the medium 2 with high precision.

[0150] On the other hand, if the medium loading surface 61a is treated with alumite to improve its durability, thereby covering the medium loading surface 61a with an insulating alumite film, the amount of charge between the medium loading surface 61a and the medium 2 increases as the transport distance of the medium 2 increases. Therefore, in this case, as the transport distance of the medium 2 increases, the electrical attraction force of the medium 2 toward the medium loading surface 61a due to static electricity increases, and there is a risk that the transport roller 27 will not be able to transport the medium 2 accurately.

[0151] Here, while referring to Figure 10 The following table shows the results of an experiment conducted to investigate how the electrical attraction force exerted on the medium 2 toward the medium loading surface 61a due to static electricity varies depending on the distance the medium 2 is transported. In this experiment, transfer paper was used as the medium 2. Furthermore, as an example, this experiment measured the tensile force when the cut medium 2 was stretched after being transported a predetermined distance on the medium loading surface 61a covered with an electroless nickel plating film. Furthermore, as a comparative example, this experiment measured the tensile force when the cut medium 2 was stretched after being transported a predetermined distance on the medium loading surface 61a treated with alumite (i.e., covered with an insulating alumite film). The medium 2 placed on the medium loading surface 61a was then cut into predetermined sizes.

[0152] like Figure 10 As shown, in the comparative example, as the transport distance of the medium 2 increases, the electrical attraction force exerted on the medium 2 toward the medium loading surface 61a due to static electricity increases, thereby increasing the tensile force exerted on the medium 2. In contrast, in the embodiment, even if the transport distance of the medium 2 increases, the electrical attraction force exerted on the medium 2 toward the medium loading surface 61a due to static electricity is less likely to occur, and thus the tensile force exerted on the medium 2 hardly changes.

[0153] (Other embodiments)

[0154] The above-described embodiment is an example of a preferred embodiment of the present invention, but the present invention is not limited thereto and can be variously modified without departing from the spirit of the present invention.

[0155] In this embodiment, the tension rod 40 and the slider 46 may be integrally formed. Furthermore, in this embodiment, one end of the tension coil spring 44 may be engaged with the tension rod 40. In this case, the slider 46 disposed on the left end of the tension rod 40 is no longer necessary. Furthermore, in this embodiment, the tension applying mechanism 12 includes, in addition to the two tension coil springs 44, a biasing member that biases the slider 46, which secures the linear scale 49, toward the upper and rearward side.

[0156] In the above-described embodiment, only the right end or the left end of the tension rod 40 may be force-applied by the tension coil spring 44. Furthermore, in the above-described embodiment, the tension rod 40 may be force-applied toward the upper and rearward side by a spring member other than the tension coil spring 44. For example, the tension rod 40 may be force-applied toward the upper and rearward side by a compression coil spring. Furthermore, the tension rod 40 may be force-applied toward the upper and rearward side by a force-applied member other than the spring member. For example, the force-applied member for applying force to the tension rod 40 toward the upper and rearward side may be a force-applied member made of rubber. Furthermore, the force-applied member for applying force to the tension rod 40 toward the upper and rearward side may be a cylinder such as an air cylinder or a damper such as a gas damper. Furthermore, the force-applied member for applying force to the tension rod 40 toward the upper and rearward side may include a motor as a driving source.

[0157] In the above embodiment, only the medium loading surface 61a of the platen body 61 may be covered with a conductive plated film. In this case, the medium loading surface 61a is also grounded. For example, the medium loading surface 61a is grounded via a conductive member in contact with the medium loading surface 61a. In addition, in the above embodiment, the plated film may be formed by electrolytic plating (electroplating). Furthermore, in the above embodiment, the plated film may be a plated film other than a nickel-plated film. In addition, in the above embodiment, at least the medium loading surface 61a of the surface of the platen body 61 may be covered with a conductive alumite film. In addition, in the above embodiment, when the printer 1 is printing only on a medium 2 that is difficult to accumulate charge between the medium loading surface 61a and the printer 1, the medium loading surface 61a may be covered with an insulating alumite film. In this case, the Vickers hardness of the medium loading surface 61a is, for example, HV400 or above.

[0158] In the form, Figure 11As shown, the number of guide rollers 9 arranged below the tension rod 40 and between the heater 10 and the winding roller 7 in the front-to-back direction may be one. In this case, the guide roller 9 contacts the upper surface of the medium 2. In the above embodiment, one of the two guide rollers 9 arranged below the tension rod 40 and between the heater 10 and the winding roller 7 in the front-to-back direction contacts the printed surface (printing surface) of the medium 2, but Figure 11 In the illustrated modification, the guide roller 9 does not contact the printing surface of the medium 2 between the heater 10 and the winding roller 7. Furthermore, in the aforementioned embodiment, two guide rollers 9, positioned below the tension rod 40 and positioned between the heater 10 and the winding roller 7 in the front-to-back direction, may contact the upper surface of the medium 2. In this case, the guide rollers 9 also do not contact the printing surface of the medium 2 between the heater 10 and the winding roller 7.

[0159] <Second embodiment>

[0160] Hereinafter, a second embodiment of the present invention will be described with reference to the drawings.

[0161] (Overall structure of an inkjet printer)

[0162] Figure 12 It is a side view for explaining the structure of the inkjet printer 101 according to the embodiment of the present invention. Figure 13 Is used to illustrate Figure 12 The schematic diagram of the structure of the printing mechanism 103 is shown.

[0163] This embodiment of an inkjet printer 101 (hereinafter referred to as "printer 101") is, for example, an office inkjet printer that prints on long media 102 (sheet-like media 102) such as paper, cloth, or resin sheets. Printer 101 can print on media 102 of varying widths, for example. Printer 101 includes a printing mechanism 103 for printing on media 102; a media transport mechanism 104 for transporting media 102; a payout roller holder 106 for holding a payout roller 105 (rolled media 102 before printing); and a take-up roller holder 108 for holding a take-up roller 107 (rolled media 102 after printing).

[0164] If the vertical direction is perpendicular to the vertical direction Figure 12 The Y direction of the medium 102 is defined as the "left-right direction", and the width direction of the medium 102, which is perpendicular to the thickness direction of the medium 102 and the longitudinal direction of the medium 102, is consistent with the left-right direction. In other words, the left-right direction (Y direction) is the width direction of the medium 102. In the following description, the left-right direction is perpendicular to the up-down direction and the left-right direction. Figure 12The X direction is set as the "front-back direction". Figure 12 The X1 direction side is set as the "front" side, and the opposite side is Figure 12 The X2 direction side of the same is set as the "back" side, and one of the left and right directions is Figure 13 The Y1 direction side of the same is defined as the "right" side, and the opposite side is defined as Figure 13 The Y2 direction side is defined as the "left" side. The left-right direction (ie, the width direction of the medium 102) of this embodiment is the main scanning direction.

[0165] The printing mechanism 103 includes: an inkjet head 111 (hereinafter referred to as "head 111"), which ejects ink onto the medium 102; a carriage 112, which carries the head 111; a carriage drive mechanism 113, which reciprocates the carriage 112 in the main scanning direction (left-right direction); and a support frame (Y-rod) 114, which supports the carriage 112 so as to be movable in the left-right direction. The head 111 ejects ink downward. A plurality of nozzles for ejecting ink are formed on the lower surface of the head 111. The head 111 includes a piezoelectric element for ejecting ink from the nozzles. The carriage drive mechanism 113 includes, for example, a belt partially fixed to the carriage 112, a pulley on which the belt is mounted, and a motor for rotating the pulley.

[0166] The printing mechanism 103 includes a platen 115 on which the medium 102 is placed during printing, and a suction mechanism 116 for sucking the medium 102 placed on the platen 115 toward the platen 115 and holding it. The platen 115 is located below the head 111 and carriage 112. The thickness direction of the medium 102 during printing by the head 111 coincides with the vertical direction. The specific structures of the platen 115 and suction mechanism 116 will be described later.

[0167] The printing mechanism 103 also includes a maintenance unit 118 for preventing clogging of the nozzles of the head 111. The maintenance unit 118 cleans the head 111 to prevent clogging of the multiple nozzles of the head 111. Specifically, the maintenance unit 118 performs flushing, which drives a piezoelectric element to forcibly eject ink from the nozzles, and ink suction, which covers the lower surface of the head 111 where the nozzles are formed with a cap to forcibly aspirate the ink in the nozzles.

[0168] As described above, the printer 101 prints on, for example, media 102 of different widths. Assuming that the widest media 102 among the media 102 printed by the printer 101 is the maximum width media 102A, the range in which the maximum width media 102A is arranged in the width direction (i.e., left-right direction) of the media 102 is the media arrangement range MR (see FIG. Figure 13), maintenance unit 118 is positioned in an area separated from the media arrangement range MR in the left-right direction (the main scanning direction), namely, the maintenance area MA. In this case, maximum-width media 102A may also be the maximum-width media printable by printer 101. In this embodiment, maintenance unit 118 is positioned further to the left of the media arrangement range MR. In this embodiment, the left side (the Y2 direction side) corresponds to the side where maintenance area MA is positioned relative to the media arrangement range MR, namely, the maintenance area side.

[0169] The media transport mechanism 104 transports the long strip of media 102 along its longitudinal direction. The media transport mechanism 104 includes a transport roller 119 and a pad roller 120. The pad roller 120 is positioned opposite the transport roller 119 and is biased toward the transport roller 119. The transport roller 119 and the pad roller 120 are positioned behind the platen 115. The transport roller 119 is connected to a drive mechanism that rotates the transport roller 119. The drive mechanism includes a motor as a driving source. The media 102 is transported while being sandwiched between the transport roller 119 and the pad roller 120. Before printing, the media 102 is transported from the rear to the top surface of the platen 115. After printing, the media 102 is transported from the top surface of the platen 115 to the front and then transported downward. In other words, the media 102 printed by the head 111 moves toward the front and then downward.

[0170] The feed roller holder 106 is located below the printing mechanism 103. It includes a rotation shaft 123 that extends through the inner periphery of the feed roller 105. The winding roller holder 108 is located below the printing mechanism 103. It includes a rotation shaft 124 that extends through the inner periphery of the winding roller 107 and a drive mechanism that rotates the rotation shaft 124.

[0171] (Structure of the platen and suction mechanism)

[0172] Figure 14 It is shown from the lower back side Figure 12 A perspective view of the suction mechanism 116, etc. is shown. Figure 15 (A) Yes Figure 12 The plan view of the platen 115 and the suction mechanism 116 shown, Figure 15 (B) Yes Figure 12 A front view of the platen 115 and the suction mechanism 116 is shown. Figure 16 Is used to illustrate Figure 12 A cross-sectional view of the structure of the platen 115 and the suction mechanism 116 is shown.

[0173] The table 115 is formed into a long strip that is slender in the left-right direction. The table 115 includes a table body 127 on which the medium 102 is placed, and a table frame 128 that supports the table body 127 from the bottom. The table frame 128 is formed into a square groove (square groove) that is slender in the left-right direction. The table frame 128 is formed by bending a thin metal plate such as a steel plate into a square groove shape. The upper surface of the table frame 128 is open. The table body 127 is formed into a long strip that is slender in the left-right direction. The table body 127 constitutes the upper surface portion of the table 115. The table body 127 is fixed to the upper end of the table frame 128 in a manner that blocks the opening of the upper surface of the table frame 128.

[0174] Side panels 129 are disposed on both sides of the table body 127 and the table frame 128 in the left and right directions to support the table frame 128. A portion of the side panels 129 constitutes a portion of the table 115, closing the openings formed at both ends of the table body 127 and the table frame 128 in the left and right directions. A space is formed inside the table 115, defined by the table body 127, the table frame 128, and portions of the two side panels 129. In other words, the table 115 is hollow. A cover 130, disposed on the front side of the table 115, and a cover 131, disposed on the rear side of the table 115, are fixed to the side panels 129.

[0175] The platen body 127 is provided with a plurality of suction holes 127a (see FIG. Figure 16 That is, a plurality of suction holes 127a are formed on the upper surface of the platen 115. A plurality of suction holes 127a are formed across substantially the entire area of ​​the platen 115. The suction holes 127a extend vertically through the platen body 127. The plurality of suction holes 127a lead to the interior space of the hollow platen 115.

[0176] A plurality of air intake holes 28a are formed on the bottom surface of the platen frame 128 and arranged in the left-right direction (see FIG. Figure 16 That is, a plurality of air intake holes 28a are formed on the lower surface of the table 115. In this embodiment, four air intake holes 28a are formed, evenly spaced in the horizontal direction. The air intake holes 28a extend vertically through the bottom surface of the table frame 128. The four air intake holes 28a lead to the interior space of the hollow table 115.

[0177] The suction mechanism 116 includes an exhaust fan 134 for exhausting air from the interior space of the platen 115 to the outside of the printer 101, and a suction fan 135 for sucking the medium 102 placed on the platen 115. The suction mechanism 116 of this embodiment includes one exhaust fan 134 and four suction fans 135. In addition, the suction mechanism 116 includes a flow path forming portion 136, which forms an air flow path for the air exhausted from the interior space of the platen 115 to pass through. The suction fan 135 is a sirocco fan. The suction fan 135 is mounted on the bottom surface of the platen frame 128 (i.e., the bottom surface of the platen 115). The four suction fans 135 are each mounted on the portion of the bottom surface of the platen frame 128 where the air intake hole 28a is formed.

[0178] The flow path forming portion 136 includes a hollow flow path forming frame 137, which is formed into a long strip that is slender in the left-right direction and has an air flow path formed therein. The flow path forming frame 137 is arranged below the suction fan 135. In addition, the flow path forming portion 136 includes a cylindrical connecting member 138 that connects the suction fan 135 to the flow path forming frame 137. Specifically, the flow path forming portion 136 includes four connecting members 138 that connect each of the four suction fans 135 to the flow path forming frame 137. In this form, the flow path forming portion 136 is composed of one flow path forming frame 137 and four connecting members 138. The inner peripheral side of the cylindrical connecting member 138 serves as the air flow path. The air intake hole 28a leads to the air flow path formed in the flow path forming portion 136. Specifically, the air intake holes 28 a lead to an air flow path formed in the flow path forming portion 136 via the suction fan 135 .

[0179] The flow path forming frame 137 is formed into a box-like, flat, and generally rectangular parallelepiped shape with a thin thickness in the vertical direction. Furthermore, the flow path forming frame 137 includes: a thin plate-shaped upper surface portion constituting the upper surface of the flow path forming frame 137; a thin plate-shaped lower surface portion constituting the lower surface of the flow path forming frame 137; thin plate-shaped side portions forming the front-to-back side surfaces of the flow path forming frame 137; and thin plate-shaped side portions constituting the left-to-right side surfaces of the flow path forming frame 137. As described above, the flow path forming frame 137 is hollow.

[0180] The left-right length of the flow path-forming frame 137 is longer than that of the base plate 115. The right end of the flow path-forming frame 137 is positioned to the right of the right end of the base plate 115, and the left end of the flow path-forming frame 137 is positioned to the left of the left end of the base plate 115. Two side plates 129 are fixed to the top surface of the flow path-forming frame 137. The flow path-forming frame 137 also supports the base plate 115 via the side plates 129.

[0181] The connecting member 138 is formed into a cylindrical shape by a thin film-like diaphragm. The connecting member 138 of this form is formed into a square cylindrical shape. The upper end portion of the connecting member 138 is connected to the suction fan 135. The lower end of the connecting member 138 is connected to the upper surface portion of the flow path forming frame 137. Specifically, an opening portion (through hole) penetrating in the up-down direction is formed on the upper surface portion of the flow path forming frame 137, and the lower end of the connecting member 138 is connected to the portion of the upper surface portion of the flow path forming frame 137 where the opening portion is formed. The inner peripheral side of the connecting member 138 leads to the internal space of the flow path forming frame 137. The connecting member 138 is set in the following state, that is, it is inclined toward the left side as it goes toward the lower side when viewed from the front side (refer to Figure 15 (B)).

[0182] The lower surface of the flow path forming frame 137 is provided with an exhaust hole 137a (see FIG. 1 ) for exhausting air from the inside of the flow path forming frame 137 to the outside of the printer 101 by the exhaust fan 134. Figure 14 Specifically, the flow path forming portion 136 is provided with an exhaust hole 137a through which the exhaust fan 134 exhausts air toward the exterior of the printer 101. Exhaust hole 137a is formed at the left end of the flow path forming frame 137. Exhaust hole 137a vertically penetrates the lower surface of the flow path forming frame 137 and opens into the interior of the flow path forming frame 137. Exhaust hole 137a is formed only at one location. Air exhausted by the exhaust fan 134 passes through exhaust hole 137a.

[0183] The exhaust fan 134 is an axial flow fan. The exhaust fan 134 is configured so that the axial direction of the exhaust fan 134 is consistent with the up-down direction. The exhaust fan 134 is mounted on the left end portion of the flow path forming frame 137. That is, the exhaust fan 134 is mounted on the flow path forming portion 136. Moreover, the exhaust fan 134 is mounted on the lower surface portion of the flow path forming frame 137. Specifically, the exhaust fan 134 is mounted on the upper surface of the lower surface portion of the flow path forming frame 137 in a manner that blocks the exhaust hole 137a. The exhaust fan 134 is configured inside the flow path forming frame 137. The exhaust fan 134 is configured at the same position as the exhaust hole 137a in the front-to-back direction and the left-to-right direction. When viewed from the up-down direction, the exhaust fan 134 overlaps with the exhaust hole 137a. The exhaust fan 134 discharges air toward the bottom.

[0184] A filter 140 is mounted on the upper surface of the exhaust fan 134. Air exhausted from the interior of the platen 115 passes through the filter 140 before being discharged to the exterior of the printer 101 by the exhaust fan 134. Specifically, the suction mechanism 116 includes the filter 140, which allows air exhausted from the interior of the platen 115 via the four air intake holes 28a to pass through. The filter 140 is positioned at the same position as the exhaust fan 134 in the front-to-back and left-to-right directions. Specifically, the filter 140 is positioned at the same position as the exhaust holes 137a in the front-to-back and left-to-right directions.

[0185] The exhaust hole 137a is arranged at a position away from the medium configuration range MR in the left-right direction. Specifically, the exhaust hole 137a is formed at the left end portion of the flow path forming frame 137 as described above, and is arranged further to the left than the medium configuration range MR. Moreover, the exhaust hole 137a is arranged further to the left than the platen 115 and is arranged in the maintenance area MA. The exhaust fan 134 and the filter 140, which are arranged at the same position as the exhaust hole 137a in the left-right direction, are also arranged at a position away from the medium configuration range MR in the left-right direction. That is, the exhaust fan 134 and the filter 140 are also arranged further to the left than the medium configuration range MR. Moreover, the exhaust fan 134 and the filter 140 are also arranged further to the left than the platen 115 and are arranged in the maintenance area MA.

[0186] In the printer 101, when the suction fan 135 operates, air is exhausted from the interior space of the platen 115. As the air is exhausted from the interior space of the platen 115, the medium 102 is drawn onto the upper surface of the platen 115, where it is held by the platen 115. Furthermore, when the exhaust fan 134 operates, air is drawn from the inner circumference of the connecting member 138 and the interior space of the flow path forming frame 137, and then exhausted from the exhaust hole 137a to the exterior of the printer 101. Specifically, when the exhaust fan 134 operates, air within the flow path of the flow path forming portion 136 is drawn and exhausted from the exhaust hole 137a to the exterior of the printer 101. The exhaust fan 134 and the suction fan 135 operate during printing on the medium 102.

[0187] (Main effect of this form)

[0188] As described above, in this embodiment, the flow path forming portion 136, which forms the flow path for air exhausted from the interior of the platen 115, includes exhaust holes 137a, which are used by the exhaust fan 134 to exhaust air toward the exterior of the printer 101. Furthermore, in this embodiment, the exhaust holes 137a are positioned laterally away from the media arrangement range MR. Therefore, in this embodiment, when air that has entered the interior of the platen 115 to draw the media 102 onto the platen 115 is exhausted toward the exterior of the printer 101, even if solidified ink mist is discharged along with the air through the exhaust holes 137a, the solid matter can be prevented from adhering to the media 102.

[0189] Therefore, in this embodiment, even if the solidified solids from the ink mist are discharged outside the printer 101 along with air that enters the hollow interior of the platen 115 when the medium 102 is drawn onto the platen 115, contamination of the medium 102 by the solids can be prevented. In particular, in this embodiment, the exhaust hole 137a is formed at the left end of the flow path-forming frame 137, which is formed into a long, narrow strip in the horizontal direction. This allows the exhaust hole 137a to be positioned away from the medium 102 in the horizontal direction. Therefore, in this embodiment, even if the solidified solids from the ink mist are discharged along with air from the exhaust hole 137a, contamination of the medium 102 by the solids can be effectively prevented.

[0190] In this embodiment, exhaust fan 134 is positioned at the same position as exhaust hole 137a in the front-to-back and left-to-right directions. Therefore, in this embodiment, exhaust fan 134 efficiently exhausts air from exhaust hole 137a toward the exterior of printer 101. Furthermore, in this embodiment, suction mechanism 116 includes a suction fan 135 in addition to exhaust fan 134. Therefore, suction fan 135 reliably draws the medium 102 placed on platen 115 toward platen 115.

[0191] In this embodiment, connecting member 138 is formed from a thin film into a cylindrical shape. Therefore, even if the relative positional accuracy of the portion of the upper surface of flow path forming frame 137, to which the lower end of connecting member 138 is connected, and the suction fan 135, to which the upper end of connecting member 138 is connected, is increased, the flexible connecting member 138 can easily connect the opening of flow path forming frame 137 and suction fan 135.

[0192] In this embodiment, air exhausted from the interior of the platen 115 through the four vent holes 128a passes through a single filter 140 and is exhausted to the exterior of the printer 101. Therefore, in this embodiment, when replacing the filter 140, only the single common filter 140 needs to be replaced. Therefore, in this embodiment, the replacement of the filter 140 can be easily performed.

[0193] (Example of Modification of Inkjet Printer)

[0194] Figure 17 It is a side view for explaining the structure of a printer 101 according to another embodiment of the present invention. Figure 18 Is used to illustrate Figure 17 The schematic diagram of the structure of the suction mechanism 116 of the printing mechanism 103 shown in FIG. Figure 17 、 Figure 18 In the figures, the same symbols are attached to the same structures as those in the above-mentioned embodiment.

[0195] In the form, Figure 17 As shown, the printer 101 may also include: a heater 145 for heating the medium 102 after printing; a tension imparting mechanism 146 for imparting tension to the medium 102 before printing; a tension imparting mechanism 147 for imparting tension to the medium 102 after printing; and a plurality of guide rollers 148 for guiding the medium 102 being transported. Figure 17 、 Figure 18 A modified example of the printer 101 is shown.

[0196] In this modified example, the medium transport mechanism 104 does not include the backup roller 120. The transport roller 119 is a rubber roller with a rubber surface. The feed roller holder 106 is positioned below the platen 115. Furthermore, the feed roller holder 106 is positioned further back than the printing mechanism 103. The winding roller holder 108 is positioned, for example, below the feed roller holder 106 and further back than the printing mechanism 103.

[0197] The tension-applying mechanism 146 includes a tension rod 150 that contacts the pre-printed medium 102 between the head 111 and the payout roller holder 106 along the medium 102's travel path to apply tension to the medium 102; and a guide that linearly guides the tension rod 150 in the vertical direction. The tension rod 150 contacts the medium 102 from above as it moves forward from the payout roller holder 106 toward the printing mechanism 103. The tension rod 150 applies tension to the medium 102 by the force of gravity acting on the tension rod 150. During printing on the medium 102, the tension rod 150 linearly moves in the vertical direction in response to the movement of the medium 102.

[0198] The tension applying mechanism 147 includes a tension rod 151 that contacts the printed medium 102 between the head 111 and the winding roller holding portion 108 in the moving path of the medium 102 to apply tension to the medium 102. The tension rod 151 is arranged in front of and below the platen 115. Figure 12As shown by the arrow, the tension rod 151 can move linearly in the front and lower direction. Moreover, the tension imparting mechanism 147 includes: a guide portion that linearly guides the tension rod 151 in the front and lower direction; and a tension coil spring that applies force to the tension rod 151 toward the upper and rear oblique side.

[0199] The tension rod 151 contacts the printed medium 102 from the upper and rear sides, which moves from the platen 115 toward the front and then toward the bottom. The tension rod 151 applies tension to the medium 102 due to the force of gravity acting on the tension rod 151. During printing on the medium 102, the tension rod 151 moves linearly toward the front and bottom in accordance with the movement of the medium 102. The slope θ of the movement direction of the tension rod 151 relative to the front-back direction when viewed from the left and right direction (see Figure 17 ) is 30°~60°.

[0200] The heater 145 is located below the platen 115. That is, the platen 115 is located above the heater 145. The heater 145 is located below the tension rod 150. Furthermore, the heater 145 is located below and behind the tension rod 151. Furthermore, the heater 145 is located below and in front of the feed roller 105 and the wind-up roller 107. That is, the feed roller 105 and the wind-up roller 107 are located above and behind the heater 145. As described above, the medium 102 printed by the printing mechanism 103 moves toward the front and then moves downward. The medium 102 moving downward passes through the tension rod 151 and then moves toward the rear. The medium 102 moving toward the rear passes above the heater 145.

[0201] The plurality of guide rollers 148 are driven rollers that rotate as the medium 102 moves. Two of the guide rollers 148 are positioned on either side of the tension bar 150 in the front-to-back direction and above the tension bar 150. Furthermore, one of the guide rollers 148 is positioned in front of the platen 115 and functions to redirect the medium 102 moving forward from the platen 115 downward. Furthermore, one of the guide rollers 148 is positioned below the tension bar 151 and on the front surface of the printer 101 and functions to redirect the medium 102 moving downward toward the rear.

[0202] In this modification, suction mechanism 116 does not include suction fan 135. The upper end of connecting member 138 is connected, for example, to the portion of the bottom surface of platen frame 128 where air intake holes 28a are formed. Specifically, in this modification, one end of air flow path 136a formed in flow path forming portion 136 is connected to the four air intake holes 28a, and the other end of flow path 136a is connected to exhaust fan 134 via filter 140. In other words, exhaust fan 134 is connected to the four air intake holes 28a via flow path 136a.

[0203] The exhaust fan 134 also serves to draw air from the medium 102 placed on the platen 115. When the exhaust fan 134 is operating, air is exhausted from the interior of the platen 115 through all four air intake holes 28a. Air in the flow path 136a is also drawn in and discharged from the exhaust hole 137a to the exterior of the printer 101. The exhaust fan 134 operates during printing on the medium 102. Similar to the aforementioned embodiment, the exhaust hole 137a, exhaust fan 134, and filter 140 are positioned laterally away from the medium placement range MR. Furthermore, the exhaust hole 137a, exhaust fan 134, and filter 140 are positioned laterally offset from the heater 145. Specifically, the exhaust hole 137a, exhaust fan 134, and filter 140 are positioned further to the left of the heater 145.

[0204] In this modification, the exhaust fan 134 also serves to suck the medium 102 placed on the platen 115. Therefore, the structure of the suction mechanism 116 can be simplified compared to a case where the suction fan 135 is provided. Furthermore, in this modification, the filter 140 is positioned away from the medium placement range MR in the left-right direction and offset from the heater 145 in the left-right direction. Therefore, even if the ink mist adhering to the filter 140 solidifies and becomes solid matter, and this solid matter falls off, it can be prevented from adhering to the medium 102 passing above the heater 145.

[0205] (Other embodiments)

[0206] The above-described embodiment is an example of a preferred embodiment of the present invention, but the present invention is not limited thereto and can be variously modified without departing from the spirit of the present invention.

[0207] In the above embodiment, the exhaust hole 137a may be located away from the maintenance area MA. Furthermore, in the above embodiment, the exhaust hole 137a may be formed at the right end of the flow path forming frame 137. In this case, the exhaust hole 137a is also located further to the right of the medium arrangement range MR and is located away from the medium arrangement range MR in the left-right direction. Furthermore, in the above embodiment, the exhaust hole 137a may be formed at multiple locations in the flow path forming frame 137. In this case, all of the multiple exhaust holes 137a are also located away from the medium arrangement range MR in the left-right direction.

[0208] In the above embodiment, the exhaust fan 134 may be arranged at a position different from the exhaust hole 137a in at least any one of the front-to-back direction and the left-to-right direction. In this case, the exhaust fan 134 and the filter 140 may be arranged in the medium configuration range MR in the left-to-right direction. Moreover, in the above embodiment, the connecting member 138 may be formed of, for example, a hard resin material. Furthermore, in the above embodiment, the flow path forming portion 136 may include one member. Moreover, in the above embodiment, the filter 140 may not be installed on the exhaust fan 134. Moreover, in the above embodiment, the exhaust fan 134 may be a fan other than an axial flow fan, and the suction fan 135 may be a fan other than a multi-blade fan.

[0209] <Third embodiment>

[0210] Hereinafter, a third embodiment of the present invention will be described with reference to the drawings.

[0211] (Schematic Structure of an Inkjet Printer)

[0212] Figure 19 This is a schematic diagram for explaining the structure of an inkjet printer 201 according to an embodiment of the present invention. Figure 20 yes Figure 19 A bottom view of the head unit 204 is shown.

[0213] The inkjet printer 201 of this embodiment (hereinafter referred to as "printer 201") is, for example, an office inkjet printer that ejects ink to print on a medium 202 such as paper. The printer 201 includes: a head unit 204 having a plurality of inkjet heads 203 (hereinafter referred to as "heads 203") that eject ink toward the medium 202; a carriage 205 that carries the head unit 204; a carriage drive mechanism 206 that moves the carriage 205 in the main scanning direction; and a guide rail 207 for guiding the carriage 205 in the main scanning direction. In the following description, the main scanning direction ( Figure 19 The Y direction of the main scanning direction is set as the "left-right direction", and the sub-scanning direction ( Figure 19 The X direction is set as the "front-back direction".

[0214] The head 203 ejects ink downward. A platen 208 is located below the head 203. The medium 202 to be printed is placed on the platen 208. The medium 202 placed on the platen 208 is transported forward and backward by a medium transport mechanism (not shown). The carriage drive mechanism 206 includes, for example, two pulleys; a belt mounted on the two pulleys and partially fixed to the carriage 205; and a motor that rotates the pulleys. When printing on the medium 202, the carriage 205 reciprocates left and right, guided by the guide rail 207. Simultaneously, the head 203 ejects ink onto the upper surface of the medium 202 placed on the platen 208.

[0215] The head unit 204 includes a plurality of heads 203 and a head fixing member for fixing the plurality of heads 203. Figure 20 As shown, the head unit 204 includes a plurality of heads 203 arranged horizontally at regular intervals at two locations in the front-rear direction. The head unit 204 has a rectangular shape when viewed from above, with the horizontal direction being the longitudinal direction.

[0216] The lower surface of the head 203 is formed with a plurality of nozzles for ejecting ink. The lower surface of the head 203 comprises a nozzle array 203a, which is formed by a plurality of nozzles arranged in the front-to-back direction. For example, one head 203 may have four nozzle arrays 203a. The head 203 includes a plurality of piezoelectric elements that eject ink from the plurality of nozzles. The lower surface of the head unit 204 forms a nozzle surface 204a on which the plurality of nozzles are formed. As described above, the outer shape of the head unit 204 when viewed from above and below is a rectangular shape with the left-right direction being the longitudinal direction, and therefore the outer shape of the nozzle surface 204a is a rectangular shape with the left-right direction being the longitudinal direction.

[0217] The printer 201 also includes a maintenance unit 209 for maintaining the head 203. The area where the head 203 prints on the medium 202 in the left-right direction (main scanning direction) is referred to as the printing area PA. The maintenance unit 209 is located in a maintenance area MA, which is a region separated from the printing area PA in the left-right direction. The maintenance unit 209 cleans the head 203 to prevent clogging of the nozzles of the head 203. Specifically, the maintenance unit 209 performs cleaning operations, such as forcing ink to be ejected from the nozzles of the head 203, or wiping the nozzle surface 204a with a wiper (not shown).

[0218] When the head 203 is cleaned by the maintenance unit 209, the head unit 204 moves to the maintenance area MA. The maintenance unit 209 includes a moisturizing device 210 (see Figure 21), the moisturizing device 210 is used to moisturize the nozzle surface 204a of the head unit 204 when printing is not being performed on the medium 202 (that is, when the head 203 is not ejecting ink). The structure of the moisturizing device 210 is described below.

[0219] (Structure of moisturizing device)

[0220] Figure 21 It is a schematic diagram for explaining the structure of the moisturizing device 210 according to the embodiment of the present invention. Figure 22 Is used to illustrate Figure 21 A block diagram of the structure of the moisturizing device 210 is shown. Figure 23 (A) is used to illustrate Figure 21 A plan view of the structure of the main container 213 is shown, Figure 23 (B) Yes Figure 23 (A) Cross-sectional view of the EE section.

[0221] The moisturizing device 210 includes a main container 213 for storing a moisturizing liquid M, and a plurality of water-absorbing members 214 arranged in the main container 213. The moisturizing liquid M is, for example, ion-exchanged water. Furthermore, the moisturizing device 210 includes: a sub-tank 215 as a sub-container, which stores the moisturizing liquid M and is connected to the main container 213; a moisturizing liquid supply portion 216 for supplying the moisturizing liquid M to the main container 213; a moisturizing liquid discharge portion 217 for discharging the moisturizing liquid M from the main container 213; and a liquid level detection mechanism 218 for detecting the height of the liquid level of the moisturizing liquid M in the sub-tank 215. Furthermore, the moisturizing device 210 includes a control portion 220 for controlling the moisturizing device 210. The control portion 220 constitutes a part of a printer control portion for controlling the printer 201. In addition, Figure 21 The water absorbing member 214 is omitted in the figure.

[0222] The main container 213 is a moisturizing barrel for moisturizing the nozzle surface 204a. The main container 213 is shaped like a box with an open top. Furthermore, the main container 213 is shaped like a flat rectangular box with a low vertical height. When viewed from above and below, the main container 213 has a rectangular shape with the left-right direction as the longitudinal direction. The main container 213 is larger than the head unit 204. As described above, the maintenance unit 209 is located in the maintenance area MA, and the main container 213 is located at a position spaced apart from the printing area PA in the left-right direction.

[0223] The water absorbing member 214 is immersed in the moisturizing liquid M in the main container 213, and absorbs and retains the moisturizing liquid M in the main container 213. The water absorbing member 214 is formed of, for example, a sponge. The water absorbing member 214 is formed into a rectangular parallelepiped shape elongated in the front-to-back direction. Figure 23As shown in Figure 2B, the water-absorbing member 214 is attached to a retaining member 222, which is fixed to the bottom surface of the main container 213. The retaining member 222 includes a flat insertion portion 222a, with the vertical direction being the thickness direction. A slit is formed in the water-absorbing member 214, into which the insertion portion 222a is inserted. By inserting the insertion portion 222a into the slit of the water-absorbing member 214, the water-absorbing member 214 is secured to the retaining member 222.

[0224] The plurality of water-absorbing members 214 are arranged in the horizontal direction at regular intervals. The spacing between the plurality of water-absorbing members 214 in the horizontal direction is equal to the spacing between the plurality of heads 203 in the horizontal direction. The upper surface of the water-absorbing member 214 is a rectangular plane perpendicular to the vertical direction. The upper surface of the water-absorbing member 214 is positioned above the liquid level of the moisturizing liquid M in the main container 213. Furthermore, the upper surface of the water-absorbing member 214 is positioned below the upper end of the main container 213.

[0225] During non-printing when the medium 202 is not being printed, the liquid level of the moisturizing liquid M in the main container 213 is located below the nozzle surface 204a (see Figure 23 (B)). Furthermore, when the nozzle surface 204a is moisturized, the upper surface of the water absorbing member 214 is arranged on the lower side of the head 203. The lower surface of the head 203 forming the nozzle array 203a and the upper surface of the water absorbing member 214 face each other with a predetermined gap therebetween. A high-humidity air layer is formed between the lower surface of the head 203 and the upper surface of the water absorbing member 214. In addition, the carriage 205 includes a lifting mechanism 245 for lifting and lowering the head unit 204 relative to the main container 213 (see Figure 19 ).

[0226] An overflow tube 223 is attached to the main container 213. This overflow tube 223 is used to discharge the moisturizing liquid M from the main container 213 when the liquid level of the moisturizing liquid M in the main container 213 exceeds a predetermined height. The overflow tube 223 is disposed within the main container 213. The overflow tube 223 is formed as a straight tube with the vertical direction as the longitudinal direction. The overflow tube 223 is connected to a waste liquid tank 232 (described later), which also constitutes a portion of the moisturizing liquid discharge unit 217, via a predetermined pipe 224 and a pipe 233 (described later), which also constitutes a portion of the moisturizing liquid discharge unit 217.

[0227] The upper end of the overflow pipe 223 is, for example, located below the upper surface of the water absorbing member 214. The lower end of the overflow pipe 223 is connected to the upper end of the pipe 224 at the bottom surface of the main container 213. The waste liquid tank 232 is located below the main container 213. The moisturizing liquid M discharged through the overflow pipe 223 is discharged from the main container 213 due to the water level difference. Figure 23 In the figure, the overflow pipe 223 is omitted.

[0228] The sub-tank 215 is formed in a rectangular box shape. The upper surface of the sub-tank 215 is covered by a lid. The lid is formed with an opening extending vertically, and the interior of the sub-tank 215 and the exterior of the sub-tank 215 are connected via the opening. The sub-tank 215 is arranged near the main container 213. The sub-tank 215 is connected to the main container 213 via the pipe 25. The sub-tank 215 and the main container 213 are connected via the pipe 25, and the moisturizing liquid M can flow between the main container 213 and the sub-tank 215. The liquid level of the moisturizing liquid M in the sub-tank 215 is equal to the liquid level of the moisturizing liquid M in the main container 213. In other words, the sub-tank 215 is provided at a position where the liquid level of the moisturizing liquid M in the sub-tank 215 is equal to the liquid level of the moisturizing liquid M in the main container 213.

[0229] The moisturizing liquid supply unit 216 includes a liquid supply tank 228 for storing the moisturizing liquid M to be supplied to the main container 213; a pipe 229 connecting the liquid supply tank 228 and the main container 213; a pump 230 for transferring the moisturizing liquid M from the liquid supply tank 228 to the main container 213; and a solenoid valve 231 disposed midway along the pipe 229. The pump 230 is disposed midway along the pipe 229. The pump 230 and the solenoid valve 231 are electrically connected to the control unit 220. When the pump 230 is driven with the solenoid valve 231 open, the moisturizing liquid M is supplied from the liquid supply tank 228 to the main container 213.

[0230] The moisturizing liquid discharge unit 217 includes a waste liquid tank 232 that stores the moisturizing liquid M discharged from the main tank 213; a pipe 233 connected at one end to the pipe 25 and at the other end to the waste liquid tank 232; and a solenoid valve 234 disposed midway along the pipe 233. The solenoid valve 234 is electrically connected to the control unit 220. As described above, the waste liquid tank 232 is disposed below the main tank 213. When the solenoid valve 234 is opened, the moisturizing liquid M is discharged from the main tank 213 into the waste liquid tank 232 due to the water level difference.

[0231] The liquid level detection mechanism 218 detects the liquid level of the moisturizing liquid M in the sub-tank 215, thereby detecting the amount of the moisturizing liquid M in the sub-tank 215. As described above, the sub-tank 215 is provided at a position where the liquid level of the moisturizing liquid M in the sub-tank 215 is equal to the liquid level of the moisturizing liquid M in the main container 213. Therefore, the liquid level detection mechanism 218 indirectly detects the liquid level of the moisturizing liquid M in the main container 213. Furthermore, the liquid level detection mechanism 218 indirectly detects the amount of the moisturizing liquid M in the main container 213.

[0232] The liquid level detection mechanism 218 includes: a float 237 that floats on the moisturizing liquid M in the sub-tank 215; a permanent magnet 238 as a detected part, which is installed on the float 237; and sensors 239 to 241, which are arranged on the outside of the sub-tank 215 and detect the permanent magnet 238. The liquid level detection mechanism 218 of this form includes three sensors 239 to 241. The permanent magnet 238 is built into the float 237. The sensors 239 to 241 are magnetic sensors such as Hall integrated circuits (ICs). The sensors 239 to 241 are fixed to the outer side of the sub-tank 215, for example. The sensors 239 to 241 are electrically connected to the control unit 220.

[0233] Sensor 239 is fixed to the outer side surface of sub-tank 215 at the upper end side of sub-tank 215. Sensor 240 is fixed to the outer side surface of sub-tank 215 at the lower side of sensor 239. Sensor 241 is fixed to the outer side surface of sub-tank 215 at the lower end side of sub-tank 215. Sensor 239 is a sensor for detecting when the liquid level of moisturizing liquid M in sub-tank 215 becomes higher than a predetermined upper limit position. Sensor 240 is a sensor for detecting when the liquid level of moisturizing liquid M in sub-tank 215 is within an appropriate range. Sensor 241 is a sensor for detecting when the liquid level of moisturizing liquid M in sub-tank 215 becomes lower than a predetermined lower limit position. In this embodiment, a portion of the detection range of sensor 239 for permanent magnet 238 overlaps a portion of the detection range of sensor 240 for permanent magnet 238.

[0234] When the liquid level of the moisturizing liquid M in the sub-tank 215 exceeds a predetermined upper limit, the permanent magnet 238 built into the float 237 is detected by the sensor 239. At this time, the permanent magnet 238 may also be detected by the sensor 240. Furthermore, if the liquid level of the moisturizing liquid M in the sub-tank 215 is within an appropriate range, the permanent magnet 238 is detected by the sensor 240 but not by the sensor 239. Furthermore, when the liquid level of the moisturizing liquid M in the sub-tank 215 falls below a predetermined lower limit, the permanent magnet 238 is detected by the sensor 241. When the liquid level of the moisturizing liquid M in the sub-tank 215 is within an appropriate range, the liquid level of the moisturizing liquid M in the main tank 213 is also within an appropriate range, and the nozzle face 204a can be properly moisturized using the moisturizing liquid M in the main tank 213.

[0235] Furthermore, for example, when the float 237 is positioned at the upper limit of the detection range of the permanent magnet 238 by the sensor 240, the liquid level of the moisturizing liquid M in the main container 213 becomes higher than the upper end of the overflow tube 223. Furthermore, when the float 237 is positioned at the lower limit of the detection range of the permanent magnet 238 by the sensor 240, the liquid level of the moisturizing liquid M in the main container 213 becomes lower than the upper end of the overflow tube 223. In this embodiment, when the permanent magnet 238 is not detected by the sensor 240 but is detected by the sensor 239, the overflow tube 223 may become clogged, for example, and the moisturizing liquid M may not be discharged through the overflow tube 223.

[0236] The moisturizing liquid supply unit 216 supplies the moisturizing liquid M to the main container 213 based on the detection result of the liquid level detection mechanism 218, and the moisturizing liquid discharge unit 217 discharges the moisturizing liquid M from the main container 213 based on the detection result of the liquid level detection mechanism 218. In other words, in the moisturizing device 210, the moisturizing liquid M is automatically supplied to and discharged from the main container 213 based on the detection result of the liquid level detection mechanism 218.

[0237] Specifically, when float 237 is positioned between the lower limit of the detection range of sensor 240 for permanent magnet 238 and the upper limit of the detection range of sensor 241 for permanent magnet 238, and none of sensors 239 and 241 detects permanent magnet 238, control unit 220 opens solenoid valve 231 and drives pump 230 to supply moisturizing liquid M from liquid supply tank 228 to main container 213 until permanent magnet 238 is detected by sensor 240. Furthermore, when sensor 239 detects permanent magnet 238, control unit 220 opens solenoid valve 234 to discharge moisturizing liquid M from main container 213 to waste liquid tank 232 until permanent magnet 238 is detected by sensor 240 and no longer detected by sensor 239.

[0238] Furthermore, in this embodiment, if the moisturizing liquid supply unit 216 automatically supplies the moisturizing liquid M to the main container 213 when the permanent magnet 238 is detected by the sensor 241, the supply of the moisturizing liquid M would take time. Therefore, when the permanent magnet 238 is detected by the sensor 241, the moisturizing liquid M is manually supplied to the main container 213, and the moisturizing liquid M is supplied to the main container 213 in a short period of time until the permanent magnet 238 is detected by the sensor 240.

[0239] (Main effect of this form)

[0240] As described above, in this embodiment, the liquid level detection mechanism 218 indirectly detects the liquid level of the moisturizing liquid M in the main tank 213. Furthermore, in this embodiment, the moisturizing liquid supply unit 216 supplies the moisturizing liquid M to the main tank 213 based on the detection result of the liquid level detection mechanism 218. Specifically, in this embodiment, the moisturizing liquid supply unit 216 supplies the moisturizing liquid M to the main tank 213 based on the indirect detection result of the liquid level of the moisturizing liquid M in the main tank 213. Specifically, in this embodiment, the moisturizing liquid supply unit 216 automatically supplies the moisturizing liquid M to the main tank 213 so that the liquid level of the moisturizing liquid M in the sub-tank 215 is within an appropriate range (i.e., the liquid level of the moisturizing liquid M in the main tank 213 is within an appropriate range), thereby enabling the nozzle face 204a to be appropriately moisturized using the moisturizing liquid M in the main tank 213.

[0241] Therefore, in this embodiment, the liquid level of the moisturizing liquid M stored in the main container 213 can be prevented from dropping excessively, so that the nozzle surface 204a can be properly moisturized using the moisturizing liquid M in the main container 213. Furthermore, in this embodiment, the moisturizing liquid discharge portion 217 discharges the moisturizing liquid M from the main container 213 based on the detection result of the liquid level detection mechanism 218 (i.e., the moisturizing liquid M is discharged from the main container 213 based on the indirect detection result of the liquid level of the moisturizing liquid M in the main container 213). Therefore, even if the moisturizing liquid M cannot be discharged through the overflow tube 223, it is possible to prevent the moisturizing liquid M from overflowing from the box-shaped main container 213 with an open top surface.

[0242] In this embodiment, the liquid level detection mechanism 218 detects the level of the moisturizing liquid M in the auxiliary tank 215. The float 237 floats on the moisturizing liquid M in the auxiliary tank 215, not in the main container 213. Therefore, in this embodiment, the float 237 does not interfere with the nozzle surface 204a. Therefore, in this embodiment, the influence of the float 237 does not hinder moisturizing of the nozzle surface 204a. Furthermore, in this embodiment, since the float 237 does not interfere with the nozzle surface 204a, the main container 213 can be positioned without considering the position of the float 237. Therefore, in this embodiment, the flexibility of the main container 213 can be increased. Furthermore, in this embodiment, damage to the nozzle surface 204a, etc., caused by interference between the float 237 and the nozzle surface 204a, does not occur.

[0243] (Modification Example 1 of the Moisturizing Device)

[0244] Figure 24 (A) is a plan view for explaining the structure of a main container 213 and the like according to another embodiment of the present invention. Figure 24 (B) Yes Figure 24 (A) is a cross-sectional view of the FF section, Figure 24 (C) Yes Figure 24(A) is a cross-sectional view of the GG section, Figure 24 (D) Yes Figure 24 (A) Cross-sectional view of the HH section. Figure 24 In the embodiment, the same symbols are attached to the same structures as those in the above embodiment. Figure 24 In (B), the water absorbing member 214 and the holding member 222 are not shown.

[0245] In the described form, the moisturizing device 210 may also include a sealing component 250, which is capable of contacting the outer peripheral end portion of the nozzle surface 204a of the head unit 204 from the bottom side. At this time, the outer shape of the nozzle surface 204a formed in a rectangular shape with the left and right directions as the long side directions is larger than the outer shape of the main container 213 formed in a rectangular shape with the left and right directions as the long side directions. Specifically, the width of the nozzle surface 204a in the left and right directions is wider than the width of the main container 213 in the left and right directions, and the width of the nozzle surface 204a in the front and back directions is wider than the width of the main container 213 in the front and back directions. In the following description, the side where the maintenance area MA is configured relative to the printing area PA, that is, one of the sides in the left and right directions ( Figure 24 The right side of (A) is referred to as the “right” side, and the opposite side is referred to as the “left” side.

[0246] At the upper end of the main container 213, seal retaining portions 213a to 213c are formed to hold the sealing member 250. These seal retaining portions 213a to 213c are formed by bending the upper portion of the side wall of the main container 213 outward, forming a flat plate with its thickness extending in the vertical direction. In this modified example, three seal retaining portions 213a to 213c are formed in the main container 213. Seal retaining portion 213a extends rightward from the upper end of the right side wall of the main container 213. Seal retaining portion 213a is formed in an elongated rectangular shape with its longitudinal direction extending in the front-to-back direction. Seal retaining portion 213b extends forward from the upper end of the front side wall of the main container 213. Seal retaining portion 213c extends rearward from the upper end of the rear side wall of the main container 213. Seal retaining portions 213b and 213c are formed in an elongated rectangular shape with their longitudinal direction extending in the left-to-right direction.

[0247] The sealing member 250 is a rubber gasket formed of rubber. For example, the sealing member 250 is formed of EPDM (Ethylene Propylene Diene Monomer) having excellent ink resistance. The sealing member 250 is formed in a slender straight line. The sealing members 250 are respectively embedded in the sealing holding portions 213a to 213c from the outer peripheral side of the main container 213. That is, the moisturizing device 210 of this modified example includes three sealing members 250. In the sealing member 250, a slit-shaped engaging recess 250a (see Figure 24 (D) The upper portion of the sealing member 250 forms a sealing portion 250b having a sealing function. The cross-sectional shape of the sealing portion 250b is a hollow semicircular shape.

[0248] As described above, the sealing members 250 are attached to the seal retaining portion 213a extending rightward from the upper end of the right side wall of the main container 213; the seal retaining portion 213b extending forward from the upper end of the front side wall of the main container 213; and the seal retaining portion 213c extending rearward from the upper end of the rear side wall of the main container 213. In other words, the sealing members 250 are positioned around the outer periphery of the main container 213. Furthermore, the sealing members 250 are positioned on three sides of the rectangular nozzle face 204a so as to contact the outer periphery of the nozzle face 204a. Specifically, one sealing member 250 is positioned so as to contact the entire right end of the nozzle face 204a, another sealing member 250 is positioned so as to contact substantially the entire front end of the nozzle face 204a, and the remaining sealing member 250 is positioned so as to contact substantially the entire rear end of the nozzle face 204a.

[0249] When the nozzle surface 204a is moisturized by the moisturizing device 210, the carriage 205 moves rightward until the nozzle surface 204a is positioned above the main tank 213. In this state, the head unit 204 is lowered by the lifting mechanism 245.

[0250] When the head unit 204 descends, as shown in FIG. Figure 24 As shown in (B), the upper end of the sealing member 250 is in close contact with the nozzle surface 204a. Specifically, when the head unit 204 is lowered, the upper end of the sealing portion 250b contacts the nozzle surface 204a at a predetermined contact pressure. Furthermore, the upper end of the sealing member 250 is in close contact with the portion of the nozzle surface 204a where the head 203 is not located.

[0251] In addition, an ink receiving portion 213d extending toward the left is formed at the upper left end portion of the main container 213. The upper surface of the ink receiving portion 213d is an inclined surface that is inclined toward the upper side as it moves toward the left side (see Figure 24 (C) A wiping device (not shown) is located on the left side of the main tank 213 for wiping the nozzle surface 204a. The ink receiving portion 213d receives ink dripping from the nozzles of the head unit 203 when the head unit 204 moves to the left side toward the wiping device after cleaning the upper side of the main tank 213.

[0252] In this modified example, the moisturizing device 210 includes a sealing member 250 that contacts the outer peripheral edge of the nozzle face 204a from below. The sealing member 250 is positioned on the outer periphery of the main container 213. Therefore, even if the printer 201 is installed in an air-conditioned room and the main container 213 is located in a drafty location, the sealing member 250 can prevent wind from flowing into the underside of the nozzle face 204a through the gap between the upper end of the main container 213 and the nozzle face 204a. Consequently, a decrease in humidity on the underside of the nozzle face 204a can be suppressed. Therefore, even if the main container 213 is located in a drafty location, drying of the nozzle face 204a caused by wind blowing around the main container 213 can be suppressed.

[0253] In particular, in this modified example, the sealing member 250 is positioned so as to contact the outer peripheral edge of the rectangular nozzle face 204a on three sides, namely, the right and left sides, in the front-back direction. Therefore, even if wind flows into the lower side of the nozzle face 204a from the gap between the upper left end of the main container 213 and the nozzle face 204a, the inflowing wind is prevented from being blown to the right and left sides in the front-back direction. Therefore, even if the main container 213 is installed in a location with wind, a decrease in humidity on the lower side of the nozzle face 204a caused by wind around the main container 213 can be effectively suppressed. Consequently, drying of the nozzle face 204a caused by wind around the main container 213 can be effectively suppressed.

[0254] (Modification Example 2 of the Moisturizing Device)

[0255] Figure 25 (A) is a plan view for explaining the structure of a main container 213 and the like according to another embodiment of the present invention. Figure 25 (B) Yes Figure 25 (A) Cross-sectional view of the JJ section. Figure 25 In the embodiment, the same symbols are attached to the same structures as those in the above embodiment. Figure 25 In (B), the water absorbing member 214 and the holding member 222 are not shown.

[0256] Figure 24In the illustrated variation, the seal retaining portions 213a to 213c may not be formed at the upper end of the main container 213. In this case, the moisturizing device 210 includes a cover member 254 arranged to surround the upper end of the main container 213. A sealing member 255, equivalent to the sealing member 250, is fixed to the upper surface of the cover member 254. Specifically, the moisturizing device 210 includes: a cover member 254 arranged to the right of the upper end of the main container 213; a cover member 254 arranged in front of the upper end of the main container 213; and a cover member 254 arranged behind the upper end of the main container 213. The sealing member 255 is fixed to the upper surface of the cover member 254 using, for example, double-sided tape.

[0257] The sealing member 255 is a rubber gasket similar to the sealing member 250, and is formed of, for example, EPDM. The cross-sectional shape of the sealing member 255 is the same as the cross-sectional shape of the sealing portion 250b, and is a hollow semicircular shape. Figure 24 In the modified example shown, the sealing member 255 is arranged on the outer periphery of the main container 213. The sealing member 255 is arranged at a position where it can contact the outer periphery of the nozzle surface 204a from below on three sides of the rectangular nozzle surface 204a.

[0258] A gap is formed between the upper end of the main container 213 and the cover member 254. That is, a gap is formed between the outer side surface of the main container 213 and the end surface of the cover member 254. The moisturizing device 210 includes a second sealing component 256 for blocking the gap formed between the upper end of the main container 213 and the cover member 254. The second sealing component 256 is, for example, an EPT sealer. That is, the second sealing component 256 is, for example, a sealing material made of EPDM. Figure 25 As shown in (B), the second sealing member 256 is fixed to the outer side surface of the main container 213 and the lower surface of the cover member 254 to close the gap between the upper end of the main container 213 and the cover member 254 from the bottom.

[0259] When the nozzle surface 204a is moisturized by the moisturizing device 210, the carriage 205 moves to the right until the nozzle surface 204a is positioned above the main container 213, and then the head unit 204 descends. Figure 25 As shown in (B), the upper end of the sealing member 255 is in close contact with the nozzle surface 204a. In this modification, the same Figure 24 Furthermore, in this modification, the second sealing member 256 blocks the gap between the upper end of the main container 213 and the cover member 254. Therefore, even if a gap is formed between the main container 213 and the cover member 254, it is possible to prevent wind from flowing into the lower side of the nozzle surface 204a through the gap between the main container 213 and the cover member 254.

[0260] (Modification Example 3 of the Moisturizing Device)

[0261] Figure 24 、 Figure 25 In the modified example shown, the moisturizing device 210 may also include four sealing members 250, 255, which are arranged at positions on the four sides of the nozzle surface 204a so as to contact the outer peripheral end portion of the nozzle surface 204a. Figure 24 、 Figure 25 In addition to the three sealing members 250 and 255 of the illustrated modification, another sealing member 250 and 255 may be positioned so as to contact the left end portion of the nozzle face 204a. In this case, the main container 213 is formed with a seal-retaining portion extending leftward from the upper end of the left side wall of the main container 213. Alternatively, a cover member 254 may be positioned to the left of the upper end of the main container 213, with the sealing member 255 secured to its upper surface. In this case, the main container 213 does not have an ink receiving portion 213d.

[0262] In this modified example, the sealing members 250 and 255 are positioned on the four sides of the nozzle face 204a so as to contact the outer peripheral edge of the nozzle face 204a. Therefore, the four sealing members 250 and 255 prevent wind from flowing into the lower side of the nozzle face 204a through the gap between the upper end of the main container 213 and the nozzle face 204a. Therefore, even if the main container 213 is installed in a windy location, a decrease in humidity on the lower side of the nozzle face 204a caused by wind around the main container 213 can be prevented. Consequently, drying of the nozzle face 204a caused by wind around the main container 213 can be prevented.

[0263] in addition, Figure 24 、 Figure 25 In the modified example shown, the moisturizing device 210 may include two sealing members 250, 255 disposed on both sides of the nozzle surface 204a at positions capable of contacting the outer peripheral end portion of the nozzle surface 204a, or may include one sealing member 250, 255 disposed on one side of the nozzle surface 204a at a position capable of contacting the outer peripheral end portion of the nozzle surface 204a. Figure 24 、 Figure 25 In the illustrated modification, the outer shape of the nozzle face 204a may be a rectangular shape, or a shape other than a rectangular shape. In this case, the moisturizing device 210 also includes a sealing member capable of contacting the outer peripheral end portion of the nozzle face 204a from below, and the sealing member is disposed on the outer peripheral side of the main container 213.

[0264] (Other embodiments)

[0265] The above-described embodiment is an example of a preferred embodiment of the present invention, but the present invention is not limited thereto and can be variously modified without departing from the spirit of the present invention.

[0266] In the above embodiment, sensors 239 to 241 may be sensors other than magnetic sensors. In this case, an object to be detected by sensors 239 to 241 other than magnetic sensors is attached to float 237. Furthermore, in the above embodiment, liquid level detection mechanism 218 may not include sensor 241.

[0267] In the above embodiment, the moisturizing liquid discharge unit 217 may include a pump that transfers the moisturizing liquid M in the main container 213 to the waste liquid tank 232. Furthermore, in the above embodiment, the moisturizing liquid M may be supplied from the liquid supply tank 228 to the main container 213 by utilizing a water level difference. In this case, the liquid supply tank 228 is positioned above the main container 213. Furthermore, in the above embodiment, the water absorbing member 214 may not be provided in the main container 213. Furthermore, in the above embodiment, the moisturizing device 210 may include a lifting mechanism for raising and lowering the main container 213. In this case, the carriage 205 may not include the lifting mechanism 245. Furthermore, in the above embodiment, the printer 201 may be a 3D printer that creates three-dimensional objects, or an inkjet printer for general consumers.

[0268] Explanation of Figure Numbers

[0269] 1: Printer

[0270] 2: Medium

[0271] 3: Printing agency

[0272] 7: Winding roller

[0273] 8: Winding roller holding part

[0274] 10: Heater

[0275] 12: Tension imparting mechanism

[0276] 17: Head (inkjet head)

[0277] 20: Table

[0278] 21: Suction mechanism

[0279] 23: Intake

[0280] 24: Piping

[0281] 25: Suction fan

[0282] 26: Filter

[0283] 40: Tension rod

[0284] 43: Guidance

[0285] 44: Tension coil spring (force applying member)

[0286] 46: Slider

[0287] 49: Linear scale

[0288] 50, 51: Sensor

[0289] 56: Tension rod support

[0290] 61: Table body

[0291] 61a: Medium loading surface

[0292] 62: Table frame

[0293] X: front and back direction

[0294] Y: Left and right direction, width direction of the media

[0295] 101: Printer (inkjet printer)

[0296] 102: Medium

[0297] 102A: Maximum width media

[0298] 104: Media transport mechanism

[0299] 107: Winding roller

[0300] 108: Winding roller holding portion

[0301] 111: Head (inkjet head)

[0302] 112: Slide

[0303] 113: Slide drive mechanism

[0304] 115: platen

[0305] 116: Suction mechanism

[0306] 118: Maintenance unit

[0307] 127a: Suction hole

[0308] 128a: Inhalation hole

[0309] 134: Exhaust fan

[0310] 135: Suction fan

[0311] 136: Flow path forming part

[0312] 136a: Flow path

[0313] 137: Flow path forming framework

[0314] 137a: Exhaust hole

[0315] 138: Connecting components

[0316] 140: Filter

[0317] 145: Heater

[0318] 147: Tension imparting mechanism

[0319] 151: Tension rod

[0320] MA: Maintenance Area

[0321] MR: Media Configuration Range

[0322] X: front and back direction

[0323] Y: width direction of the media, main scanning direction

[0324] Y2: Maintenance area side

[0325] 201: Printer (inkjet printer)

[0326] 202: Medium

[0327] 203: Head (inkjet head)

[0328] 204: Head unit

[0329] 204a: Nozzle surface

[0330] 205: Slide

[0331] 206: Slide drive mechanism

[0332] 210: Moisturizing device

[0333] 213: Main container

[0334] 213a to 213c: Seal holding portion

[0335] 215: Secondary tank (secondary container)

[0336] 216: Moisturizing liquid supply department

[0337] 217: Moisturizing fluid discharge part

[0338] 218: Liquid level detection mechanism

[0339] 237: Float

[0340] 238: Permanent magnet (object to be detected)

[0341] 239-241: Sensor

[0342] 250, 255: Sealing parts

[0343] 254: Cover member

[0344] 256: Second sealing component

[0345] M: Moisturizing liquid

[0346] PA: Printing Area

Claims

1. A printer, characterized in that include: A printing mechanism for printing on long strips of media; A winding roller holding unit holds the printed medium wound into a roll, i.e., the winding roller; and a tension applying mechanism including a tension rod, the tension rod being in contact with the printed medium between the printing mechanism and the winding roller holding portion to apply tension to the medium. The width direction of the medium is consistent with the left-right direction orthogonal to the up-down direction. The thickness direction of the medium when printing is performed by the printing mechanism is consistent with the up-down direction. When a direction perpendicular to the up-down direction and the left-right direction is defined as a front-back direction, the medium printed by the printing mechanism moves toward the front side and then toward the bottom side. The tension rod is arranged below the printing mechanism and contacts the medium moving downward from the upper and rear side. The tension rod applies tension to the medium by gravity acting on the tension rod. The tension imparting mechanism includes: a guide portion for linearly guiding the tension rod in a forward and downward direction; and a force applying member for applying force to the tension rod toward the upper and rear oblique side.

2. The printer according to claim 1, wherein: The tension imparting mechanism includes two guide portions and two force applying members. One of the guide portions guides the right end side of the tension rod, The other guide portion guides the left end side of the tension rod, One of the force applying members applies force to the right end portion of the tension rod, The other urging member urges the left end portion of the tension rod.

3. The printer according to claim 2, wherein: The tension imparting mechanism includes: two sliders formed independently of the tension rod and capable of linearly moving in the same direction as the moving direction of the tension rod; and a linear scale and a sensor for detecting the position of the tension rod. The linear scale is fixed to one of the two sliders. One of the sliders contacts the right end of the tension rod from the oblique front lower side. The other slider contacts the left end of the tension rod from the oblique front lower side. The urging member is engaged with the slider to urge the slider toward the upper and rearward side.

4. The printer according to claim 3, wherein: The tension applying mechanism includes a tension rod supporting portion that is arranged on an upper side of the guide portion and supports the tension rod separated from the guide portion.

5. The printer according to any one of claims 1 to 4, characterized in that: The guide portion guides the tension rod in a direction inclined by 30° to 60° with respect to the front-rear direction when viewed from the left-right direction.

6. The printer according to any one of claims 1 to 4, characterized in that include: A heater for heating the printed medium. The heater is arranged below and behind the tension rod. The winding roller is arranged above and behind the heater. The medium having passed through the tension rod then moves toward the rear side by passing through the upper side of the heater.

7. The printer according to claim 6, wherein: The printing mechanism includes: an inkjet head for ejecting ink onto the medium; a platen for placing the medium during printing; and a suction mechanism for sucking the medium placed on the platen onto the platen and holding it. The platen is arranged on the upper side of the heater, The suction mechanism includes: a plurality of air intake ports arranged in a left-right direction; a suction fan connected to the plurality of air intake ports via piping; and a filter disposed in the middle of the piping path between the plurality of air intake ports and the suction fan, for allowing air sucked in from the plurality of air intake ports to pass through. The filter is arranged at a position offset from the heater in a horizontal direction.

8. The printer according to any one of claims 1 to 4, characterized in that: The printing mechanism includes: an inkjet head for ejecting ink onto the medium; and a platen for placing the medium during printing. The platen includes: a platen body having a medium placement surface on which the medium is placed; and a platen frame supporting the platen body from below. The table body is made of aluminum or aluminum alloy. At least the medium placement surface of the surface of the platen body is covered with a conductive coating.

9. The printer according to claim 8, characterized in that The coating is a plating coating.

10. The printer according to claim 9, wherein: The plated film is a nickel plated film.

11. An inkjet printer for printing on long strips of media, the inkjet printer comprising: an inkjet head for ejecting ink onto the medium; a platen disposed below the inkjet head and on which the medium to be printed is placed; and a suction mechanism for sucking the medium placed on the platen to the platen and holding it, A plurality of suction holes for sucking the medium placed on the platen are formed on the upper surface of the platen. The plurality of suction holes lead to the inner space of the hollow platen. The suction mechanism includes: an exhaust fan for exhausting air from the interior space of the platen to the outside of the inkjet printer; and a flow path forming portion for forming an air flow path for the air exhausted from the internal space of the table to pass through, If the widest medium among the media printed by the inkjet printer is defined as the maximum width medium, the range in which the maximum width medium is arranged in the width direction of the medium perpendicular to the thickness direction of the medium and the long side direction of the medium is defined as the medium arrangement range, The exhaust fan is installed on the flow path forming portion. The flow path forming portion is provided with an exhaust hole for exhausting air toward the outside of the inkjet printer by the exhaust fan. The exhaust hole is arranged at a position away from the medium arrangement range in the width direction of the medium.

12. The inkjet printer according to claim 11, wherein The exhaust fan is arranged at the same position as the exhaust hole in the width direction of the medium.

13. The inkjet printer according to claim 11 or 12, characterized in that include: a carriage carrying the inkjet head; A carriage driving mechanism for reciprocating the carriage along the width direction of the medium, i.e., the main scanning direction; and a maintenance unit for preventing the nozzles of the inkjet head from being clogged, The maintenance unit is arranged in a maintenance area that is away from the medium arrangement range in the main scanning direction. If the side where the maintenance area is arranged relative to the medium arrangement range in the main scanning direction is defined as the maintenance area side, The exhaust hole is arranged closer to the maintenance area than the medium arrangement range.

14. The inkjet printer according to claim 11 or 12, characterized in that: The suction mechanism includes a suction fan for sucking the medium placed on the platen. The suction fan is installed on the bottom surface of the table. The flow path forming portion includes: a hollow flow path forming frame formed into a long strip in the width direction of the medium and forming an air flow path therein; and a cylindrical connecting member connecting the suction fan to the flow path forming frame. The exhaust fan is mounted on one end portion of the flow path forming frame in the width direction of the medium. The exhaust hole is formed at the one end portion of the flow path forming frame in the width direction of the medium.

15. The inkjet printer according to claim 14, wherein The connecting member is formed of a thin film-like diaphragm into a cylindrical shape.

16. The inkjet printer according to claim 11 or 12, characterized in that: The suction mechanism includes a filter through which air exhausted from the interior space of the platen passes. The filter is arranged at a position away from the medium arrangement range in the width direction of the medium.

17. The inkjet printer according to claim 11 or 12, characterized in that: A plurality of air intake holes are formed on the lower surface of the platen and arranged along the width direction of the medium. The plurality of air intake holes lead to the inner space of the platen and to the air flow path formed in the flow path forming portion. The exhaust fan also functions to suck the medium placed on the platen.

18. The inkjet printer according to claim 17, characterized in that include: A medium conveying mechanism conveys the medium along the longitudinal direction of the medium; a winding roller holding portion holds the printed medium wound into a roll, i.e., the winding roller; a tension imparting mechanism having a tension rod that contacts the printed medium between the inkjet head and the winding roller holding portion on the moving path of the medium to impart tension to the medium; and a heater for heating the printed medium. If the direction perpendicular to the width direction and the up-down direction of the medium is defined as the front-back direction, The thickness direction of the medium when printing with the inkjet head is consistent with the up-down direction, The medium printed by the inkjet head moves toward the front side and then moves toward the bottom side. The tension rod is arranged below the platen and contacts the medium moving downward from the upper and rear sides. The tension rod applies tension to the medium by gravity acting on the tension rod. The heater is arranged below and behind the tension rod. The winding roller is arranged above and behind the heater. The medium having passed through the tension rod then moves toward the rear side through the upper side of the heater. The platen is arranged on the upper side of the heater, The suction mechanism includes a filter through which air exhausted from the inner space of the platen through the plurality of suction holes passes. The filter is arranged at a position away from the medium arrangement range in the width direction of the medium and is arranged at a position offset from the heater in the width direction of the medium.

19. The inkjet printer according to claim 11, wherein The maximum width medium is a medium of the maximum width that can be printed by the inkjet printer.

20. A moisturizing device for moisturizing a nozzle surface of a head unit having a plurality of inkjet heads, the moisturizing device comprising: The main container is formed in a box shape with an open upper surface and stores a moisturizing liquid for moisturizing; A secondary container for storing the moisturizing liquid and connected to the main container; a moisturizing liquid supply unit for supplying the moisturizing liquid to the main container; and a liquid level detection mechanism for detecting the height of the liquid level of the moisturizing liquid in the secondary container. The liquid level of the moisturizing liquid in the main tank is arranged below the nozzle surface during non-printing when the inkjet head is not ejecting ink. The moisturizing liquid can be transferred between the main container and the sub-container. The liquid level of the moisturizing liquid in the secondary container is equal to the liquid level of the moisturizing liquid in the main container. The moisturizing liquid supply unit supplies the moisturizing liquid to the main tank based on a detection result of the liquid level detection mechanism.

21. The moisturizing device according to claim 20, characterized in that include: a moisturizing liquid discharge portion for discharging the moisturizing liquid from the main container, The moisturizing liquid discharge portion discharges the moisturizing liquid from the main container based on a detection result of the liquid level detection mechanism.

22. The moisturizing device according to claim 20 or 21, characterized in that: The liquid level detection mechanism includes: a float floating on the moisturizing liquid in the auxiliary container; a detection object mounted on the float; and a sensor disposed outside the auxiliary container and detecting the detection object.

23. The moisturizing device according to claim 20 or 21, characterized in that include: a sealing member capable of contacting the outer peripheral end portion of the nozzle face from below, The outer shape of the nozzle surface is larger than the outer shape of the main container, The sealing member is arranged on the outer peripheral side of the main container.

24. The moisturizing device according to claim 23, characterized in that: The nozzle surface has a rectangular shape. The sealing member is arranged at a position capable of contacting an outer peripheral end portion of the nozzle face on at least three sides of the rectangular nozzle face.

25. The moisturizing device according to claim 23, characterized in that: A seal holding portion for holding the seal member is formed at an upper end portion of the main container.

26. The moisturizing device according to claim 23, characterized in that include: a cover member arranged to surround the upper end portion of the main container, The sealing member is fixed to the upper surface of the cover member.

27. The moisturizing device according to claim 26, characterized in that include: The second sealing member closes a gap formed between the upper end portion of the main container and the cover member.

28. An inkjet printer, characterized in that include: The moisturizing device according to claim 20 or 21; The head unit comprises a plurality of inkjet heads; a carriage carrying the head unit; and a carriage driving mechanism for moving the carriage along a main scanning direction, The main tank is arranged at a position away from a printing area in a main scanning direction. The printing area is an area where the inkjet head prints on a medium.

Images