JP2008279712A - Fluid discharge apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluid discharge apparatus which cools a recording head while preventing dew condensation. <P>SOLUTION: A region surrounded by a cover 40 is partitioned into a forward space in front of a discharge head 24 in its moving direction, and a backward space in its backside. Even if the backward space easily becomes in a hot and humid condition owing to heat of a heater 37 and humidity of vapor of ink, the backward space is prevented from becoming in the hot and humid condition, through introduction of cool air. Even if hot and humid air remains in the forward space, it is discharged outside, and therefore, the forward space is prevented from becoming in the hot and humid condition. The discharge head 24 is always subjected to cool air while a carriage 22 is moving, and is kept at a low temperature. The discharge head 24 can be cooled thereby without generation of dew condensation in the discharge head 24. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a fluid ejection device.

2. Description of the Related Art Conventionally, a recording apparatus that suppresses an increase in temperature of an ink discharge port due to radiant heat of a heating apparatus for drying ink discharged on a recording sheet is known. For example, in the recording apparatus of Patent Document 1, the residence time of a recording head that stays at a recording position is measured, and the temperature of the peripheral portion of the ink ejection port is controlled by capping the ink ejection port with a cap member every predetermined time. Yes. Patent Document 1 also discloses a method for cooling an ink discharge port using a cooling fan or a Peltier element.
JP 10-315474 A

  However, when the ink discharge port is cooled by the cooling method described in Patent Document 1, the cooled ink discharge port moves in high-temperature and high-humidity air generated by heating the recording sheet. For this reason, there is a possibility that condensation may occur at the ink discharge port.If water droplets generated by the condensation adhere to the ink discharge port or drop onto the recording sheet, the recording quality may be deteriorated. is there.

  SUMMARY An advantage of some aspects of the invention is that it provides a fluid discharge device that can cool a recording head without causing condensation.

  The present invention adopts the following means in order to achieve the above-mentioned object.

The fluid ejection device of the present invention is
A discharge head having a nozzle for discharging a fluid containing a solvent to the target and capable of reciprocating a predetermined range wider than the width of the target;
A heater for heating the target and drying the fluid landed on the target;
A cover formed in a shape surrounding a region including the predetermined range and allowing a fluid discharged from a nozzle of the discharge head to land on the target;
A cold air generating unit provided with a cold air generator for generating cold air;
Of the two spaces generated by dividing the area surrounded by the cover into the ejection head, the rear space behind the direction in which the ejection head moves has become less than atmospheric pressure as the ejection head moves. A suction valve that is sometimes opened to communicate the cold air generation unit and the rear space;
It is equipped with.

  In this fluid ejection device, the area surrounded by the cover is divided by the ejection head into two spaces, a front space in front of the direction in which the ejection head moves and a rear space in the rear. At this time, even if the rear space is likely to be in a hot and humid state due to the heat from the heater and the moisture of the discharged fluid vapor, the introduction of the cool air can prevent the rear space from being in a hot and humid state. . Further, since the cover has a shape that allows the fluid discharged from the nozzle of the discharge head to land on the target, the front space and the rear space are not completely sealed. For this reason, even if high-temperature and high-humidity air remains in the front space in front of the ejection head, it is possible to prevent the front space from being in a high-temperature and high-humidity state. Furthermore, the discharge head is constantly in contact with cold air during movement. Therefore, the discharge head can be cooled without causing condensation on the discharge head.

  In the fluid discharge device according to the present invention, when the cold air generation unit and the rear space are communicated with each other by the suction valve, the cold air of the cold air generation unit is rearward only by a pressure difference between the rear space and the cold air generation unit. It is good also as what flows into space. In this way, since the airflow generated between the ejection head and the target can be reduced, the mist generated when the fluid is ejected from the ejection head scatters over a wide range, and the fluid deviates from the predetermined landing position of the target. Can be reduced.

  In the fluid ejection device of the present invention, the ejection head may include a piston function unit that functions as a piston of the cylinder when the cover is regarded as a cylinder. By the piston motion, the ability to exhaust the air in the front space and the ability to suck cool air into the rear space can be further enhanced.

  In the fluid ejection device of the present invention, the suction valve may be provided at a position outside the predetermined range. In this way, even if condensation occurs around the suction valve, it is possible to prevent water droplets from falling on the target or the discharge head.

  The fluid ejection device according to the present invention opens the front space when the front space in the front of the direction in which the ejection head moves out of the two spaces exceeds the atmospheric pressure as the ejection head moves. And a discharge valve that communicates with the outside of the cover. It is considered that the pressure in the front space exceeds the atmospheric pressure when the air is insufficiently discharged from the front space. For this reason, by providing the discharge valve, the discharge path can be appropriately secured even in such a case.

  In the fluid discharge device of the present invention, the cold air generator may have a plurality of cooling fins, and the cooling fins may cool the surrounding air to generate cold air. In this way, the ability to cool the surrounding air can be further enhanced.

  In the fluid ejection device of the present invention, the cover includes a side wall portion surrounding the periphery of the region including the predetermined range and an upper surface portion covering an upper portion of the region including the predetermined range, and the suction valve includes the cover The discharge valve may be provided on the upper surface of the cover.

  The fluid discharge device of the present invention includes a temperature recognizing unit that recognizes the temperature of the discharge head, and cold air generation by the cold air generator so that the temperature of the discharge head recognized by the temperature recognizing unit falls within a predetermined temperature range. And a control means for controlling the capability. In this way, the temperature around the ejection head can be kept within the optimum temperature range for operation. In the fluid ejection device according to the present invention adopting this aspect, the control unit lowers the cooling capacity of the cooling unit when the temperature of the ejection head falls within a predetermined low temperature range, and the temperature of the ejection head increases to a predetermined high level. When entering the temperature range, the cooling capacity of the cooling means may be increased. Here, the “predetermined temperature range” is a temperature range in which printing can be performed without lowering the recording quality, and may be, for example, a range of 20 ° C. to 35 ° C. The “predetermined low temperature range” may be, for example, less than 20 ° C., and the “predetermined high temperature range” may be, for example, 35 ° C. or more.

  Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing an outline of the configuration of a printer 20 according to an embodiment of the present invention, FIG. 2 is a configuration diagram showing an outline of the configuration of a printer mechanism 21, and FIG. 3 is a perspective view of a generation chamber 50. FIG.

  The printer 20 (corresponding to the fluid ejection device of the present invention) of the present embodiment prints an image by ejecting water-based paint as ink onto a signboard made of iron or the like as the print medium S (corresponding to the target of the present invention), for example. It is configured as a large size special printer. The printer 20 is a printer mechanism 21 that performs printing by ejecting ink droplets onto a printing medium S conveyed by a conveying roller 35 driven by a drive motor 33 from the back to the front in the drawing on the platen 36 (FIG. 2). Reference), a cover 40 covering the printer mechanism 21, a first cool air generation chamber 50 and a second cool air generation chamber 51 that generate cool air sucked into the cover 40, and an operation panel on which a user inputs various instructions. 60 (see FIG. 2), and a controller 70 (see FIG. 2, corresponding to the control means of the present invention) that controls the entire printer 20.

  As shown in FIG. 2, the printer mechanism 21 includes a carriage 22 (corresponding to a piston function part of the present invention) reciprocating left and right along a guide 38 by a carriage belt 32, cyan (C), magenta (M), and yellow. (Y), red (R), blue (B), and black (K) ink cartridges 28 that can individually store ink and supply ink to the carriage 22 via an ink tube (not shown), and the ink cartridge 28 Are provided with a discharge head 24 that applies pressure to each of the inks supplied from, and a heater 37 that is provided on the upper surface of the platen 36 and that dries the ink discharged to the print medium S. As the carriage 22 is driven by the carriage motor 34a, the carriage belt 32 laid between the carriage motor 34a attached to the right side of the mechanical frame 31 and the driven roller 34b attached to the left side of the mechanical frame 31 is driven. And reciprocates in a range wider than the width of the print medium S. Here, a so-called off-carriage type in which the ink cartridge 28 is not mounted on the carriage 22 is employed. Further, the carriage 22 is formed to have substantially the same size as a cross section obtained by cutting the cover 40 at a right angle to the moving direction of the carriage 22. The ejection head 24 is provided below the carriage 22, and each color is applied from a nozzle 23 provided on the lower surface of the ejection head 24 by applying a voltage to the piezoelectric element to deform the piezoelectric element and pressurize the ink. Ink is ejected. The discharge head 24 may employ a method in which ink is pressurized by bubbles generated by applying voltage to a heating resistor (for example, a heater) to heat the ink. A linear encoder 25 that detects the position of the carriage 22 is disposed on the rear surface of the carriage 22, and the position of the carriage 22 can be managed using the linear encoder 25. The temperature sensor 27 (corresponding to the temperature recognition means of the present invention) is disposed below the carriage 22 (see FIG. 4), and can measure the temperature of the ejection head 24. The ink cartridge 28 is detachably attached to the mechanical frame 31 and contains water-based acrylic paint in which a solvent is water and an acrylic resin is dispersed as each color ink.

  As shown in FIG. 1, the cover 40 surrounds the front surface, the upper surface, and the left and right ends of a region including a range in which the carriage 22 can reciprocate. Since the lower surface of the cover 40 is open, the ink ejected from the nozzles 23 of the ejection head 24 is allowed to land on the print medium S (see FIG. 2). Further, a first suction valve 44 and a second suction valve 45 (see FIG. 2) are respectively provided on the left and right side surfaces of the cover 40, that is, outside the movement range of the carriage 22. Further, a first discharge valve 42 and a second discharge valve 43 are provided on the upper surface of the cover 40 and on both the left and right sides of the cover 40, respectively. Further, the space surrounded by the cover 40 is divided by the carriage 22 into two spaces, a front space and a rear space, with respect to the movement direction of the carriage 22. Here, when the carriage 22 moves from the right end to the left end, the space on the right side of the carriage 22 that is the rear space becomes less than the atmospheric pressure, and the first suction valve 44 opens to the inside, and the first cold air generation chamber 50 and The first discharge valve 42 is closed while communicating with the rear space. On the other hand, the space on the left side of the carriage 22 that is the front space exceeds the atmospheric pressure, the second discharge valve 43 opens to the outside, and the front space communicates with the outside of the cover 40 and the second suction is performed. The valve 45 is closed. Conversely, when the carriage 22 moves from the left end to the right end, the space on the left side of the carriage 22 that is the rear space becomes less than atmospheric pressure, and the second suction valve 45 opens to the inside, and the second cold air generation chamber 51 The second exhaust valve 43 is closed while communicating with the rear space. On the other hand, the space on the right side of the carriage 22 that is the front space exceeds the atmospheric pressure, opens to the outside of the first discharge valve 42, communicates the front space and the outside of the cover 40, and is the first suction valve. 44 is closed. A plurality of first discharge valves 42, second discharge valves 43, first suction valves 44, and second suction valves 45 are provided, and all are closed when the carriage 22 is stopped.

  As shown in FIG. 1, the first cold air generation chamber 50 is provided on the outer right side of the cover 40. The first cold air generation chamber 50 is formed in a substantially rectangular parallelepiped shape with the front and back surfaces open, and includes a first cold air generator 52 inside. As shown in FIG. 3, the first cold air generator 52 includes a plurality of metal cooling fins, and is connected to a first pipe 54 through which a refrigerant cooled by a cooler (not shown) flows. When the refrigerant cooled by the first pipe 54 is supplied to the inside of the first cold air generator 52, the cooling fins are cooled to cool the surrounding air. At this time, the cooling capacity of the first cold air generator 52 is increased by widening the surface of the first cold air generator 52 with a plurality of cooling fins. The second cold air generation chamber 51 provided on the left side outside the cover 40 is similarly provided with a second cold air generator 53 (see FIG. 4) connected to the second pipe 55 inside. .

  The operation panel 60 is a device for a user to input various instructions to the printer 20, and includes a display unit that displays characters, figures, or symbols corresponding to the various instructions, and an operation unit that performs various operations. Is provided.

  As shown in FIG. 2, the controller 70 is provided on a main board 39 attached to the back surface of the mechanical frame 31, and is configured as a microprocessor centered on the CPU 72. The controller 70 stores various processing programs and writes data. An erasable flash ROM 73, a RAM 74 for temporarily storing and storing data, an interface (I / F) 75 for exchanging information with an external device, and an input / output port (not shown) are provided. ing. A signal from the temperature sensor 27 and a signal from the operation panel 60 are input to the controller 70 via an input port (not shown), and a print job output from the user PC 100 is input via the I / F 75. Entered. Further, from the controller 70, a control signal to the ejection head 24, a control signal to the drive motor 33, a drive signal to the carriage motor 34a, a control signal to the first cool air generator 52 and the second cool air generator 53, and an operation A display command or the like to the panel 60 is output via an output port (not shown).

  Next, the operation of the printer 20 of this embodiment configured as described above will be described. During printing, the printer 20 energizes the heater 37 to heat the print medium S. Then, while moving the carriage 22 from the right end to the left end, ink is ejected from the nozzles 23 of the ejection head 24 onto the print medium S. When the carriage 22 reaches the left end, the print medium S is transported by a predetermined amount by the transport roller 35. Subsequently, ink is ejected from the nozzles 23 of the ejection head 24 onto the print medium S while moving the carriage 22 from the left end to the right end. When the carriage 22 reaches the right end, the print medium S is conveyed by a predetermined amount by the conveyance roller 35. . The ink that has landed on the printing medium S is heated and quickly fixed by the heater 37, so that the water quickly evaporates and is well fixed. By repeating these operations, printing on the print medium S is performed.

  If such an operation is repeated, the ejection head 24 may become high temperature due to the radiant heat from the print medium S heated by the heater 37. In this embodiment, the ejection head 24 is surrounded by the cover 40 as the carriage 22 moves. The discharge head 24 is prevented from being heated to a high temperature by sucking cold air into the region. Hereinafter, this point will be described in detail.

  First, as shown in FIG. 4A, the case where the carriage 22 moves from the right end to the left end will be described. Since the carriage 22 has substantially the same size as a cross section obtained by cutting the cover 40 at a right angle to the moving direction of the carriage 22, the carriage 22 functions as a piston when the cover 40 is regarded as a cylinder. The area surrounded by the cover 40 is divided into two spaces by the carriage 22 on which the ejection head 24 is mounted. When the carriage 22 moves from the right end to the left end, the space on the right side of the carriage 22 that is the rear space becomes less than atmospheric pressure, the first suction valve 44 is opened, and the first cold air generation chamber 50 and the rear space are opened. Therefore, the cold air generated in the first cold air generation chamber 50 is sucked into the rear space only by the pressure difference. At the same time, the space on the left side of the carriage 22 that is the front space exceeds the atmospheric pressure, and the first discharge valve 42 opens to communicate the front space and the outside of the cover 40, so that the air in the front space is pressurized. It is discharged to the outside only by the difference. Note that since the lower surface of the cover 40 is open, the air in the front space is also discharged from the lower surface of the cover 40.

  Next, the case where the carriage 22 moves from the left end to the right end as shown in FIG. 4B will be described. When the carriage 22 moves from the left end to the right end, the space on the left side of the carriage 22 that is the rear space becomes less than atmospheric pressure, the second suction valve 45 opens, and the second cold air generation chamber 51 communicates with the rear space. Therefore, the cold air generated in the second cold air generation chamber 51 is sucked into the rear space only by the pressure difference. At the same time, the space on the right side of the carriage 22, which is the front space, exceeds the atmospheric pressure, and the second discharge valve 43 is opened to communicate the front space with the outside of the cover 40. It is discharged to the outside only by the difference. Note that since the lower surface of the cover 40 is open, the air in the front space is also discharged from the lower surface of the cover 40.

  In this way, even if the rear space is likely to be hot and humid due to heat from the heater 37 and moisture due to the ink vapor, it can be prevented from being hot and humid because cold air is introduced. Further, even if hot and humid air remains in the front space, it is discharged to the outside, so that the front space can be prevented from becoming hot and humid. Furthermore, since the ejection head 24 is constantly in contact with the cold air during the movement of the carriage 22, the ejection head 24 can be maintained at a low temperature.

  Next, control of the cooling capacity of the first cold air generator 52 and the second cold air generator 53 will be described using a flowchart. FIG. 5 is a flowchart showing an example of a cool air generator control processing routine executed by the CPU 72 of the controller 70. This cold air generator control processing routine is stored in the flash ROM 73 and is repeatedly executed by the CPU 72 every predetermined time (for example, every several tens of seconds).

  When this routine is started, the CPU 72 first inputs the temperature of the ejection head 24 from the temperature sensor 27 (step S100). Subsequently, it is determined whether or not the input temperature of the ejection head 24 falls within a high temperature range (for example, 35 ° C. or more) (step S110). Here, it is assumed that the high temperature range is set in the flash ROM 73 in advance. When the temperature of the discharge head 24 is within the high temperature range, the flow rate of the refrigerant supplied to the first cold air generator 52 and the second cold air generator 53 is increased (step S120), and this routine is ended. By doing so, the heat exchange efficiency between the cooling fins of the first cold air generator 52 and the second cold air generator 53 and the surrounding air is improved, and cooler cold air is generated. The temperature of the temperature tends to decrease.

  On the other hand, when the temperature of the ejection head 24 is not within the high temperature range in step S110, the CPU 72 determines whether or not the temperature of the ejection head 24 falls within a predetermined low temperature range (for example, 20 ° C. or less) (step S110). S130). Here, it is assumed that the low temperature range is set in the flash ROM 73 in advance. When the temperature of the ejection head 24 does not fall within the low temperature range, this routine ends. In such a case, since the temperature of the ejection head 24 is within an appropriate temperature range, it is not necessary to change the cooling capacity of the first cold air generator 52 and the second cold air generator 53.

  On the other hand, when the temperature of the discharge head 24 is within a predetermined low temperature range (for example, 20 ° C. or less) in step S130, the flow rate of the refrigerant supplied to the first cold air generator 52 and the second cold air generator 53 is decreased. (Step S140), this routine is finished. By doing so, the heat exchange efficiency between the cooling fins of the first cold air generator 52 and the second cold air generator 53 and the surrounding air is lowered, and a slightly high temperature cold air is generated. The temperature of the becomes easy to rise. In step S140, the refrigerant flow rate may be zero.

  According to the printer 20 of the present embodiment described in detail above, the space surrounded by the cover 40 includes two spaces, a front space in the direction in which the discharge head 24 moves by the discharge head 24 and a rear space in the rear. It is divided into. At this time, even if the rear space is likely to be in a hot and humid state due to heat from the heater 37 or moisture due to the ink vapor, the introduction of cold air can prevent the rear space from being in a hot and humid state. Moreover, even if hot and humid air remains in the front space, it is discharged to the outside, so that the front space can be prevented from becoming hot and humid. Furthermore, since the ejection head 24 is constantly in contact with the cold air during the movement of the carriage 22, the ejection head 24 can be maintained at a low temperature. Accordingly, the discharge head 24 can be cooled without causing condensation on the discharge head 24.

  Further, since the first suction valve 44 or the second suction valve 45 is opened when the pressure in the rear space becomes less than the atmospheric pressure, cold air flows into the rear space due to the pressure difference, and the discharge head 24 and the printing medium. It is possible to reduce the air flow generated between the ink and the mist, and to reduce the mist generated when the ink is ejected from the ejection head 24 and the deviation of the ink from the predetermined landing position of the printing medium S. Can be made.

  Furthermore, when the cover 40 is regarded as a cylinder, the carriage 22 has a function as a piston of the cylinder, so that it is possible to further enhance the air discharge capability to the front space and the air suction capability to the rear space.

  Furthermore, since the first suction valve 44 or the second suction valve 45 is provided at a position outside the movement range of the discharge head 24, even if the first suction valve 44 or the second suction valve 45 is condensed, It is possible to prevent water droplets from falling on the print medium S or the ejection head 24.

  And since the air of front space is discharged | emitted by the 1st discharge valve 42 and the 2nd discharge valve 43, even when the area | region enclosed by the cover 40 is near a sealing state, a discharge path | route can be ensured.

  Further, since the first cold air generator 52 and the second cold air generator 53 have a large surface area in contact with the surrounding air by a plurality of cooling fins, the ability to cool the surrounding air can be further increased.

  Furthermore, a temperature sensor 27 is provided at the lower part of the carriage 22, and when the temperature is within the high temperature range, the cooling capacity of the first cold air generator 52 and the second cold air generator 53 is increased, and the temperature is increased. When the temperature is within the low temperature range, the cooling capacity of the first cold air generator 52 and the second cold air generator 53 is lowered, so that the temperature of the discharge head 24 can be maintained within an appropriate range.

  It should be noted that the present invention is not limited to the above-described embodiment, and it goes without saying that the present invention can be implemented in various modes as long as it belongs to the technical scope of the present invention.

  For example, in the above-described embodiment, the carriage 22 has a size that substantially matches the size of the cross section of the cover 40 perpendicular to the moving direction of the carriage. However, as shown in FIG. A plate-like shielding plate 123 may be attached to the side surface of the carriage 122 so that the size of the cover 40 substantially coincides with the size of the cross section of the cover 40.

  In the above-described embodiment, cold air is generated by flowing the cooled refrigerant through the first pipe 54 and the second pipe 55 connected to the first cold air generator 52 and the second cold air generator 53. Cold air may be generated using a thermoelectric element such as an element.

  In the above-described embodiment, the so-called off-carriage type printer mechanism 21 having the ink cartridge 28 on the housing side is used. However, a so-called on-carriage type printer mechanism having the ink cartridge 28 mounted on the carriage 22 may be used. Even in this case, the same effect as the above-described embodiment can be obtained.

  In the above-described embodiment, the printer mechanism 21 that discharges water-based paint onto an iron plate or the like has been described. However, a printer mechanism that discharges ink in which a dye or pigment is dispersed in water or an organic solvent may be used. In addition, the print medium S that receives ink is not particularly limited, and may be, for example, paper, film, iron plate, glass, or the like. Even in this case, the same effect as the above-described embodiment can be obtained.

  In the above-described embodiment, the full-color printer 20 adopting the ink jet method is used. However, a multi-function printer equipped with a scanner may be used, or a complex printing apparatus such as a FAX machine or a copier may be used. Even in this case, the same effect as the above-described embodiment can be obtained.

FIG. 2 is a perspective view illustrating a schematic configuration of a printer 20. FIG. 2 is a configuration diagram showing an outline of the configuration of a printer mechanism 21. FIG. 4 is a perspective view of the first cold air generation chamber 50. Explanatory drawing for demonstrating the movement of a carriage 22 and air. The flowchart which shows an example of a cold air generator control processing routine. Explanatory drawing of the carriage 122 of other embodiment.

Explanation of symbols

  20 printer, 21 printer mechanism, 22, 122 carriage, 23 nozzle, 24 discharge head, 25 linear encoder, 27 temperature sensor, 28 ink cartridge, 31 mechanical frame, 32 carriage belt, 33 drive motor, 34a carriage motor, 34b driven Roller, 35 Conveying roller, 36 Platen, 37 Heater, 38 Guide, 39 Main board, 40 Cover, 42 First discharge valve, 43 Second discharge valve, 44 First suction valve, 45 Second suction valve, 50 First Cold air generation chamber, 51 2nd cold air generation chamber, 52 1st cold air generator, 53 2nd cold air generator, 54 1st pipe, 55 2nd pipe, 60 operation panel, 70 controller, 72 CPU, 73 Flash ROM, 74 RAM, 75 I / F, 100 user PC, 23 shielding plate, S print media.

Claims (8)

A discharge head having a nozzle for discharging a fluid containing a solvent to a target, and capable of reciprocating a predetermined range wider than the width of the target;
A heater for heating the target and drying the fluid landed on the target;
A cover formed in a shape surrounding a region including the predetermined range and allowing a fluid discharged from a nozzle of the discharge head to land on the target;
A cold air generating unit provided with a cold air generator for generating cold air;
Of the two spaces generated by dividing the area surrounded by the cover into the ejection head, the rear space behind the direction in which the ejection head moves has become less than atmospheric pressure as the ejection head moves. A suction valve that is sometimes opened to communicate the cold air generation unit and the rear space;
A fluid ejection device comprising: When the cold air generation unit and the rear space are communicated by the suction valve, the cold air of the cold air generation unit flows into the rear space only by a pressure difference between the rear space and the cold air generation unit.
The fluid ejection device according to claim 1. The discharge head has a piston function part that functions as a piston of the cylinder when the cover is regarded as a cylinder.
The fluid ejection device according to claim 1 or 2. The suction valve is provided at a position outside the predetermined range;
The fluid ejection device according to claim 1. The fluid ejection device according to any one of claims 1 to 4,
Of the two spaces, the front space that is in front of the direction in which the discharge head moves exceeds the atmospheric pressure as the discharge head moves to open the front space and the outside of the cover. Communicating discharge valve,
A fluid ejection device comprising: The cold air generator has a plurality of cooling fins, and the cooling fins cool the surrounding air to generate cold air.
The fluid ejection device according to claim 1. The fluid ejection device according to any one of claims 1 to 6,
Temperature recognition means for recognizing the temperature of the ejection head;
Control means for controlling the cold air generation capability of the cold air generator so that the temperature of the discharge head recognized by the temperature recognition means falls within a predetermined temperature range;
A fluid ejection device comprising: The control means lowers the cooling capacity of the cooling means when the temperature of the discharge head enters a predetermined low temperature range, and increases the cooling capacity of the cooling means when the temperature of the discharge head enters a predetermined high temperature range. ,
The fluid ejection device according to claim 7.

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