JP7437929B2 - inkjet recording device - Google Patents

Description

The present invention relates to an inkjet recording device.

Techniques related to inkjet recording devices have been proposed. For example, Patent Document 1 discloses an inkjet recording device. An inkjet recording device supplies ink containing a solvent stored in an ink container to a print head, and collects ink that is not used for printing into the ink container. The print head prints on the object to be printed. The ink particles ejected from the nozzle are electrically charged and fly between the high-voltage electrode and the ground electrode, and as they fly, they are deflected according to the amount of charge and adhere to the printing object. The inkjet recording apparatus supplies purge air to the ink container when the ink in the ink container increases to a specified value or more or when the ink concentration is diluted by mixing with a solvent. Along with this, the solvent evaporates and the ink becomes highly concentrated. A concentration sensor is provided in the ink container. The density sensor detects ink density. The concentration sensor may be of a type that detects ink viscosity or may be of a type that detects ink liquid level.

Patent Document 2 discloses a printing device. An inkjet printer as a printing device prints an image on printing paper by ejecting ink. Inks are manufactured by dispersing color formers, viscosity modifiers, and stabilizers in a water or alcohol solvent. Ink contains components that evaporate or volatile. When printing is not performed, the recording head is covered with a cap and the nozzles are sealed. This prevents evaporation or volatilization of ink components and avoids thickening of the ink. In an inkjet printer, when the power switch is off, moisturizing ink is supplied from the recording head to a moisturizing space formed between the recording head and the cap. The moisturizing ink is supplied periodically based on the measured value of the timer. In addition, the moisturizing ink is supplied when the humidity within the moisturizing space or the concentration of the solvent is below a predetermined value. A humidity sensor or concentration sensor is provided within the cap.

In addition, Patent Document 3 by the applicant discloses an ink. The ink contains a fluororesin and a solvent. The solubility parameter value of the solvent is 7-11. The solvent includes one or both of a glycol ether solvent and an acetate solvent.

Japanese Patent Application Publication No. 2012-11609 Japanese Patent Application Publication No. 2003-1838 Japanese Patent Application Publication No. 2018-24775

An inkjet recording device can repeatedly record high-quality patterns by discharging ink onto a recording medium. The ink contains an organic solvent. This organic solvent evaporates when the pattern is recorded. The evaporated components of the organic solvent of the ink may accumulate in a specific space within the inkjet recording apparatus, and the amount thereof may increase.

SUMMARY OF THE INVENTION An object of the present invention is to provide an inkjet recording apparatus that can control the evaporation components of organic solvents in ink and record patterns repeatedly.

One aspect of the present invention is an inkjet recording apparatus that conveys a recording medium and records a pattern on the recording medium, the inkjet recording apparatus comprising: a conveyor that conveys the recording medium; and a conveyor that conveys the recording medium; an inkjet head that ejects ink from a plurality of nozzles; and a detector that detects an evaporated component of an organic solvent in the ink; In the inkjet recording apparatus, a recording area in which an inkjet head is provided is provided below the recording medium being conveyed , and in the inkjet recording apparatus, the evaporated component of the organic solvent of the ink is sucked by a suction device, and the inkjet head If the detected value of the evaporated component of the organic solvent of the ink detected by the device is lower than a reference value predetermined as an upper limit of the detected value, the ejection of the ink from the plurality of nozzles is set to the first state, When the detected value is higher than the reference value, the inkjet recording apparatus is configured to enter a second state in which the ink ejection from the plurality of nozzles is stopped or is reduced from the first state .

According to this inkjet recording apparatus, the evaporated component of the organic solvent of the ink can be detected at a position below the recording medium being conveyed in the recording area.

The detector may be provided downstream of the most upstream end of the conveyance path in the recording area in the conveyance direction in which the recording medium is conveyed. According to this configuration, it is possible to detect the evaporated component of the organic solvent of the ink flowing downstream in the conveying direction as the recording medium is conveyed in the recording area at a position below the recording medium being conveyed.

The detector may detect the concentration or amount per unit volume of the evaporated component of the organic solvent of the ink. According to this configuration, it is possible to detect the concentration or amount per unit volume of the evaporated component of the organic solvent of the ink.

The plurality of nozzles may be arranged in a direction perpendicular to a direction in which the recording medium is transported along the transport path. According to this configuration, the pattern can be recorded on the recording medium at high speed.

According to the present invention, it is possible to obtain an inkjet recording device that can control the evaporated components of the organic solvent of the ink and record patterns repeatedly.

FIG. 1 is a perspective view showing an example of a schematic configuration of an inkjet recording apparatus. A state in which the support stand of the conveyance machine is located at the upstream end of the conveyance path in the conveyance direction is shown. A part of the top surface and a part of the side surface of the cover are cut away and shown. It is a perspective view showing an example of arrangement of a support stand. This shows the state in which the support base has reached the recording area. It is a perspective view showing an example of arrangement of a support stand. The support stage is shown passing over the detector in the second region. A part of the top surface and a part of the side surface of the cover are cut away and shown. It is a perspective view showing an example of arrangement of a support stand. A state in which the support stand is at the downstream end of the conveyance path in the conveyance direction is shown. A part of the top surface and a part of the side surface of the cover are cut away and shown. FIG. 2 is a bottom view showing an example of a schematic configuration of an inkjet head. The nozzle arrangement is shown. The positional relationship between the recording area and the detector in the transport direction is shown.

Embodiments for implementing the present invention will be described using the drawings. The present invention is not limited to the configurations described below, and various configurations can be adopted based on the same technical idea. For example, some of the configurations shown below may be omitted or replaced with other configurations. The invention may include other configurations. The drawings schematically depict certain configurations. Hatching indicates the cut plane. The broken line is a hidden line. The two-dot chain line is an imaginary line.

<Inkjet recording device>
The inkjet recording apparatus 10 will be explained with reference to FIGS. 1 to 5. The inkjet recording apparatus 10 conveys a recording medium 15 and records a pattern on the recording medium 15 (see FIGS. 1 to 4). In FIGS. 3 and 4, the pattern attached to the recording medium 15 corresponds to the pattern recorded on the recording medium 15. The recording medium 15 is a construction material. Exterior wall materials are exemplified as building materials. However, the recording medium 15 may be a construction material different from the exterior wall material. The recording medium 15 may be a short medium different from building materials. The recording medium 15 includes various short media on which patterns can be recorded. In the embodiment, the recording medium 15 is a short medium. However, the recording medium may be any of various long media on which patterns can be recorded.

The inkjet recording apparatus 10 records a pattern using four colors of ink: yellow, magenta, cyan, and black. However, ink of a different color from these may be used to record the pattern. The number of ink colors may be 3 or less or 5 or more. If weather resistance is required for the recording medium 15 on which a pattern is recorded, it is preferable to use ink containing a fluororesin to record the pattern. Ink containing fluororesin has excellent weather resistance.

When the ink contains a fluororesin, the ink contains an organic solvent as a solvent. Examples of organic solvents include glycol ether solvents. Examples of glycol ether solvents include diethylene glycol diethyl ether, diethylene glycol dimethyl ether, diethylene glycol isopropyl methyl ether, tripropylene glycol dimethyl ether, diethylene glycol butyl methyl ether, propylene glycol monophenyl ether, tetraethylene glycol dimethyl ether, propylene glycol monomethyl ether, and ethylene glycol monophenyl ether. Examples include benzyl ether. The glycol ether solvent may be one type of solvent selected from the group including the plurality of organic solvents described above or a mixed solvent of two or more types.

Regarding the physical properties of glycol ether solvents, taking diethylene glycol diethyl ether as an example, the flash point is 71°C and the ignition point is 174°C. Diethylene glycol diethyl ether is 5.6 times heavier than air. In the embodiment, the four-color inks of yellow, magenta, cyan, and black contain a fluororesin and diethylene glycol diethyl ether. The organic solvent may be different from the glycol ether solvent. For example, the organic solvent may be the organic solvent disclosed in Patent Document 3 in addition to the above-mentioned organic solvents. The organic solvent is appropriately determined in consideration of various conditions.

The inkjet recording apparatus 10 includes a conveyor 20, inkjet heads 30Y, 30M, 30C, and 30K, a carriage 40, a heating device 50, a detector 60, and a cover 70 (see FIGS. 1 to 5). The inkjet recording device 10 is connected to a suction device 80 via an exhaust pipe (not shown). In FIG. 2, illustration of the cover 70 and the suction device 80 is omitted. In FIG. 5, illustration of the conveyor 20, cover 70, and suction device 80 is omitted.

The conveyance machine 20 conveys the recording medium 15. In the embodiment, the path along which the recording medium 15 is conveyed by the conveyor 20 is referred to as a "conveyance path T" (see FIG. 2), and the direction in which the recording medium 15 is conveyed by the conveyor 20 is referred to as a "conveyance direction" (see FIG. (See 1 to 5). The transport direction is a horizontal direction, and the transport path T is a horizontal straight path.

The inkjet recording apparatus 10 employs a known linear conveyance machine as the conveyance machine 20. Therefore, the conveyor 20 includes a stator 21 and a movable element 22. Stator 21 is provided along the conveyance direction. The mover 22 reciprocates on the stator 21 in the transport direction and the opposite direction. A linear conveyor is a known conveyor that uses a linear motor. Therefore, other explanations regarding the stator 21 and mover 22 will be omitted.

The transport machine 20 further includes a support stand 23. The support stand 23 is provided on the movable element 22 . The support stand 23 moves in the same direction as the movable element 22 as the movable element 22 moves in the transport direction and the opposite direction. The support stand 23 supports the recording medium 15. In the inkjet recording apparatus 10, the recording medium 15 is carried into the upstream end of the conveyance path T in the conveyance direction (see FIG. 1). The support stand 23 supports the recording medium 15 at this position.

The conveyance machine 20 moves the support base 23 that supports the recording medium 15 in the conveyance direction by moving the movable element 22 in the conveyance direction (see FIGS. 1 to 4). The support stand 23 moves along the transport path T from the upstream end to the downstream end in the transport direction while supporting the recording medium 15 . Thereafter, the recording medium 15 is carried out from the support stand 23 at the downstream end of the carrying path T in the carrying direction (see FIG. 4). The conveyor 20 moves the movable member 22 in the opposite direction to the conveyance direction, thereby moving the support base 23 that does not support the recording medium 15 in the opposite direction to the conveyance direction (not shown). The support stand 23 moves along the transport path T from the downstream end to the upstream end in the transport direction without supporting the recording medium 15 . The conveyance machine 20 only needs to be capable of conveying the recording medium 15 in the conveyance direction, and may be a conveyance machine different from a linear conveyance machine.

In the embodiment, in addition to the transport direction, the first direction and the second direction are used as directions for identifying the inkjet recording apparatus 10. The second direction is orthogonal to both the transport direction and the first direction. The first direction is the vertical direction, and the second direction is the horizontal direction. One side in the first direction is referred to as the "first side", and the other side in the first direction is referred to as the "second side". The first side in the first direction is the upper side in the vertical direction, and the second side in the first direction is the lower side in the vertical direction.

The inkjet head 30Y records a pattern on the recording medium 15 using yellow ink. The inkjet head 30Y discharges yellow ink from the first side to the second side in the first direction. The inkjet head 30M records a pattern on the recording medium 15 using magenta ink. The inkjet head 30M discharges magenta ink from the first side to the second side in the first direction. The inkjet head 30C records a pattern on the recording medium 15 using cyan ink. The inkjet head 30C discharges cyan ink from the first side to the second side in the first direction. The inkjet head 30K records a pattern on the recording medium 15 using black ink. The inkjet head 30K discharges black ink from the first side to the second side in the first direction.

The inkjet heads 30Y, 30M, 30C, and 30K are line-type inkjet heads. Inkjet heads 30Y, 30M, 30C, and 30K have similar configurations. The inkjet heads 30Y, 30M, 30C, and 30K have a plurality of nozzles 31 (see FIG. 5). The plurality of nozzles 31 in the inkjet heads 30Y, 30M, 30C, and 30K are arranged in a range equal to or larger than the width W of the recording medium 15 in the second direction. The plurality of nozzles 31 arranged in the second direction form a nozzle row N. Inkjet heads 30Y, 30M, 30C, and 30K include two nozzle rows N. However, the number of nozzle rows in one inkjet head may be one or three or more.

The inkjet recording apparatus 10 can employ known line-type inkjet heads as the inkjet heads 30Y, 30M, 30C, and 30K. Therefore, other explanations regarding the inkjet heads 30Y, 30M, 30C, and 30K will be omitted.

Inkjet heads 30Y, 30M, 30C, and 30K are mounted on the carriage 40 in line with each other in the transport direction (see FIGS. 1 to 5). In the inkjet recording apparatus 10, the inkjet heads 30Y, 30M, 30C, and 30K are provided in the order of the inkjet head 30Y, the inkjet head 30M, the inkjet head 30C, and the inkjet head 30K in the transport direction. However, the arrangement order of the inkjet heads 30Y, 30M, 30C, and 30K in the transport direction may be different from the above-mentioned order. The arrangement order of these is determined as appropriate in consideration of various conditions.

The recording area R0 is an area where the inkjet heads 30Y, 30M, 30C, and 30K are provided in the transport path T (see FIGS. 1 to 4). The recording area R0 includes the range in the transport direction from the upstream end of the next first nozzle 32 in the transport direction to the downstream end of the next second nozzle 33 in the transport direction (see FIG. 5). The first nozzle 32 is provided at the most upstream side in the transport direction of all the nozzles 31 provided in the inkjet heads 30Y, 30M, 30C, and 30K. The second nozzle 33 is provided at the most downstream side in the transport direction of all the nozzles 31 provided in the inkjet heads 30Y, 30M, 30C, and 30K.

In the embodiment, the first nozzles 32 form the next first nozzle row N1. The first nozzle row N1 is provided at the most upstream side in the transport direction among all the nozzle rows N of the inkjet heads 30Y, 30M, 30C, and 30K. In the inkjet recording apparatus 10, the inkjet head 30Y is provided on the most upstream side in the transport direction, so the first nozzle row N1 is the nozzle row N provided on the most upstream side in the transport direction of the inkjet head 30Y. The second nozzle 33 forms the next second nozzle row N2. The second nozzle row N2 is provided at the most downstream side in the transport direction among all the nozzle rows N of the inkjet heads 30Y, 30M, 30C, and 30K. In the inkjet recording apparatus 10, the inkjet head 30K is provided at the most downstream side in the transport direction, so the second nozzle row N2 is the nozzle row N provided at the most downstream side in the transport direction of the inkjet head 30K.

The heating device 50 heats the recording medium 15 being conveyed by the conveyor 20 (see FIGS. 2 and 3). By heating the recording medium 15, the drying of the ink that has landed on the recording medium 15 can be accelerated. Accordingly, ink bleeding can be prevented. The heating device 50 includes a first heater 51 and a second heater 52 (see FIGS. 1 to 5).

The first heater 51 is provided in the first region R1 and heats the recording medium 15 being conveyed in the first region R1 (see FIG. 2). The first region R1 is a region on the upstream side of the recording region R0 in the transport direction in the transport path T (see FIGS. 1 to 5). The first heater 51 is provided on the first side in the first direction with respect to the recording medium 15 being conveyed in the first region R1 (see FIG. 2). Therefore, the first heater 51 heats the recording medium 15 being conveyed in the first region R1 from the front side of the recording medium 15. The first heater 51 is preferably provided at a position in the first direction where the second side surface in the first direction does not touch the surface of the recording medium 15 being conveyed through the first region R1. The surface of the recording medium 15 is a surface that becomes the first side in the first direction when the recording medium 15 is supported by the support base 23.

The second heater 52 is provided in the second region R2 and heats the recording medium 15 being conveyed in the second region R2 (see FIG. 3). The second region R2 is a region on the downstream side of the recording region R0 in the transport direction in the transport path T (see FIGS. 1 to 5). The second heater 52 is provided on the first side in the first direction with respect to the recording medium 15 being conveyed in the second region R2 (see FIG. 3). Therefore, the second heater 52 heats the recording medium 15 being conveyed in the second region R2 from the front side of the recording medium 15. The second heater 52 is preferably provided at a position in the first direction where the second side surface in the first direction does not touch the surface of the recording medium 15 being conveyed through the second region R2.

The temperature at which the recording medium 15 is heated by the heating device 50 is preferably lower than the ignition point of the organic solvent of the ink. This heating temperature is more preferably lower than the flash point of the organic solvent of the ink. That is, when the organic solvent of the ink is diethylene glycol diethyl ether, the heating temperature of the recording medium 15 by the heating device 50 is preferably lower than 174°C, and more preferably lower than 71°C. The heating temperature of the recording medium 15 by the heating device 50 includes the following first heating temperature and second heating temperature. The first heating temperature is the heating temperature of the recording medium 15 by the first heater 51. The second heating temperature is the temperature at which the recording medium 15 is heated by the second heater 52.

The detector 60 detects evaporated components of the organic solvent of the ink. Preferably, the detector 60 detects the concentration or amount per unit volume of the evaporated component of the organic solvent of the ink. Examples of quantities per unit volume include mass per unit volume. For example, when the organic solvent of the ink is diethylene glycol diethyl ether, the detector 60 detects the concentration or amount per unit volume of the evaporated component of diethylene glycol diethyl ether. However, the detector 60 may detect both the concentration and the amount per unit volume of the evaporated component of the organic solvent of the ink. The detector employed as the detector 60 is appropriately determined depending on the type of organic solvent in the ink. A known detector can be used as the detector 60. Therefore, a description regarding a detector that can be used as the detector 60 will be omitted.

The detector 60 is provided below (on the second side in the first direction) the recording medium 15 being conveyed through the recording area R0 by the conveyor 20. Regarding “below the recording medium 15”, the reference position of the recording medium 15 is the surface of the recording medium 15. That is, the detector 60 is provided on the second side in the first direction from the surface of the recording medium 15 that is being conveyed through the recording area R0 by the conveyor 20. Furthermore, it is preferable that the detector 60 be provided downstream from the most upstream end of the recording area R0 in the transport direction. That is, the detector 60 is preferably provided downstream from the most upstream end of the first nozzle 32 in the transport direction. The most upstream end of the first nozzle 32 in the transport direction can also be said to be the most upstream end of the first nozzle row N1 in the transport direction.

In the embodiment, the detector 60 is provided in the second region R2 below the recording medium 15 being conveyed in the recording region R0. Furthermore, the detector 60 is provided in the second region R2 and on the second side in the first direction from the back surface of the recording medium 15 being conveyed through the recording region R0. The back surface of the recording medium 15 is a surface that becomes the second side in the first direction when the recording medium 15 is supported by the support base 23. The support stand 23 passes over the detector 60 when passing through the second region R2 (see FIG. 3). The inkjet recording apparatus 10 includes a stay 65 (see FIGS. 1 to 5). The stay 65 is provided on the stator 21 and supports the detector 60 at the above-described position. However, this installation structure of the detector 60 is merely an example. Detector 60 may be supported in the aforementioned position by a different mounting structure.

The cover 70 covers the conveyor 20, the inkjet heads 30Y, 30M, 30C, and 30K, the carriage 40, and the detector 60 (see FIGS. 1, 3, and 4). The front face 71 of the cover 70 is provided with a carry-in port 72, and the back face 73 of the cover 70 is provided with a carry-in port 74. The front surface 71 is the upstream surface of the cover 70 in the conveyance direction. The back surface 73 is the surface of the cover 70 on the downstream side in the conveyance direction.

The recording medium 15 is carried through the carry-in port 72 to the upstream end of the carrying path T in the carrying direction, and placed on the support stand 23 (see FIG. 1). The recording medium 15 is carried out from the support stand 23 at the downstream end of the carrying path T in the carrying direction through the carrying out port 74 (see FIG. 5). In FIG. 1, the recording medium 15 before being carried in is shown by a two-dot chain line, and the recording medium 15 supported by the support stand 23 after being carried in is shown by a solid line. In FIG. 4, the recording medium 15 supported by the support stand 23 before being carried out is shown by a solid line, and the recording medium 15 after being carried out is shown by a two-dot chain line.

The back surface 73 of the cover 70 is further provided with an exhaust port 75 (see FIGS. 1, 3, and 4). An exhaust pipe is connected to the exhaust port 75. The exhaust pipe is connected to a suction device 80 at the end opposite to the exhaust port 75 . However, the suction device 80 may be provided directly at the exhaust port 75. In this case, the exhaust pipe may be omitted. The suction device 80 sucks the air inside the cover 70. As the suction device 80, a known suction device can be employed. For example, the suction device 80 includes an electric motor. A fan is attached to the rotating shaft of the electric motor. The fan rotates as the electric motor drives. Accordingly, the suction device 80 suctions the air inside the cover 70. This air contains evaporated components of the organic solvent of the ink.

<Control with inkjet recording device>
In the inkjet recording apparatus 10, the following control may be executed depending on the concentration or amount per unit volume of the evaporated component of the organic solvent of the ink detected by the detector 60. The inkjet recording apparatus 10 includes a controller (not shown). This control is performed by a controller. In this description, the concentration or amount per unit volume of the evaporated component of the organic solvent of the ink detected by the detector 60 is referred to as a "detected value", and the value predetermined as the upper limit of the detected value is referred to as a "reference value". For example, the reference value is appropriately determined in consideration of the lower explosive concentration limit of the organic solvent in the ink detected by the detector 60. That is, it is preferable that the reference value is a predetermined value below this lower explosive limit concentration.

<Pattern record>
When “detected value≦reference value” or “detected value<reference value”, the conveyor 20 conveys the recording medium 15 in the conveyance direction, and the inkjet heads 30Y, 30M, 30C, 30K Ink is ejected onto the recording medium 15. That is, the inkjet recording apparatus 10 records the pattern on the recording medium 15. When "detected value>reference value" or "detected value≧reference value", the inkjet heads 30Y, 30M, 30C, and 30K do not eject ink. In this case, the conveyor 20 may stop conveying the recording medium 15. That is, the inkjet recording apparatus 10 does not record the pattern on the recording medium 15.

It is assumed that "detected value>reference value" or "detected value≧reference value" is satisfied while the recording medium 15 is passing through the recording area R0. In this case, the conveyor 20 continues to convey the recording medium 15, and the inkjet heads 30Y, 30M, 30C, and 30K continue to eject ink onto the recording medium 15. After the recording medium 15 passes through the recording area R0, the inkjet heads 30Y, 30M, 30C, and 30K do not eject ink.

When "detected value≦reference value" or "detected value<reference value", the amount of applied ink per unit time ejected from the inkjet heads 30Y, 30M, 30C, and 30K is set as the reference applied amount. If "detected value > standard value" or "detected value ≧ standard value", the amount of ink applied per unit time ejected from the inkjet heads 30Y, 30M, 30C, 30K may be lower than the standard amount. good. When "detected value≦reference value" or "detected value<reference value" is satisfied, this application amount is set to the reference application amount.

It is assumed that the inkjet recording apparatus 10 is provided with a loading machine. The loading machine automatically loads the recording medium 15 through the loading port 72. In FIGS. 1 to 4, illustration of the loading machine is omitted. For example, the loading machine is provided adjacent to the front surface 71 of the cover 70. When “detected value≦reference value” or “detected value<reference value”, the loading machine loads the recording medium 15. If “detected value>reference value” or “detected value≧reference value”, the loading machine does not load the recording medium 15.

<Air suction>
When “detected value≦reference value” or “detected value<reference value”, the suction device 80 does not suck air. When “detected value>reference value” or “detected value≧reference value”, the suction device 80 suctions air. Air suction is controlled by driving or stopping the suction device 80. That is, suction of air starts when the suction device 80 is driven, and stops when the suction device 80 is stopped. In addition, air suction is controlled by opening or closing the following solenoid valves. The above-mentioned solenoid valve is provided in the exhaust pipe that connects the exhaust port 75 and the suction device 80. That is, air suction is started by opening the solenoid valve and stopped by closing the solenoid valve. In this case, the suction device 80 may be in a constant driving state. However, when the solenoid valve is in the closed state, the suction device 80 may be stopped.

Regardless of the relationship between the detected value and the reference value, the suction device 80 may be in a constantly driven state. In this case, the suction device 80 may change the driving state according to "detected value≦reference value" or "detected value<reference value" and "detected value>reference value" or "detected value≧reference value." That is, the suction device 80 is driven in the first state when “detected value≦reference value” or “detected value<reference value”, and “detected value>reference value” or “detected value≧reference value”. If so, drive in the second state. When the suction device 80 is driven in the second state, it suctions more air than when it is driven in the first state.

<Effects of embodiment>
According to the embodiment, the following effects can be obtained.

(1) The inkjet recording apparatus 10 includes a conveyor 20, inkjet heads 30Y, 30M, 30C, and 30K, and a detector 60 (see FIGS. 1 to 5). The conveyance machine 20 conveys the recording medium 15. The inkjet heads 30Y, 30M, 30C, and 30K eject ink from a plurality of nozzles 31 onto the recording medium 15 being conveyed by the conveyor 20. The detector 60 detects evaporated components of the organic solvent of the ink. The detector 60 is provided below the recording medium 15 being conveyed in the recording area R0 on the conveyance path T.

Therefore, the evaporated component of the organic solvent of the ink can be detected at a position below the recording medium 15 being conveyed in the recording area R0. By controlling the evaporated components of the organic solvent in the ink, it is possible to record patterns repeatedly. It is assumed that a detector 60 capable of detecting the concentration or amount per unit volume of the evaporated component of the organic solvent of the ink is employed as the detector. In this case, the detector 60 can detect the concentration or amount per unit volume of the evaporated component of the organic solvent of the ink.

(2) The detector 60 is provided downstream from the most upstream end of the recording area R0 in the transport direction (see FIGS. 1 to 5). Therefore, the evaporated component of the organic solvent of the ink flowing downstream in the transport direction as the recording medium 15 is transported can be detected at a position below the recording medium 15 being transported in the recording region R0.

(3) The inkjet heads 30Y, 30M, 30C, and 30K are line-type inkjet heads, and the plurality of nozzles 31 are arranged in the second direction (see FIG. 5). Therefore, the pattern can be recorded on the recording medium 15 at high speed.

<Modified example>
Embodiments can also be as follows. Some of the configurations of the modified examples shown below can also be employed in combination as appropriate. Below, points different from the above will be explained, and explanations of similar points will be omitted as appropriate.

(1) The inkjet recording apparatus was an inkjet recording apparatus 10 equipped with line-type inkjet heads 30Y, 30M, 30C, and 30K (see FIGS. 1 to 5). As an inkjet recording apparatus, a different type of apparatus from the inkjet recording apparatus 10 has been put into practical use. In this description, this different type of inkjet recording device will be referred to as a "serial type." The configuration in which the detector 60 is provided at the following position can also be adopted in a serial type inkjet recording apparatus. The above-mentioned position is below the recording medium 15 being conveyed through the recording area R0 on the conveyance path T. Furthermore, the above-mentioned position is preferably a position downstream from the most upstream end of the recording area R0 in the transport direction.

A serial type inkjet recording device includes inkjet heads for the number of colors used to record a pattern. The pattern is recorded while the inkjet head is moved back and forth in the second direction. The conveyance machine 20 intermittently conveys the recording medium 15 supported by the support stand 23 in the conveyance direction on the conveyance path T in response to the next movement of the inkjet head. The aforementioned movement is movement from one side to the other side in the second direction, and movement from the other side to the one side in the second direction. In a serial type inkjet recording apparatus, the recording region R0 can also be said to be the region through which the inkjet head passes in the transport path T. In this inkjet head, a plurality of nozzles are arranged in the transport direction. A serial type inkjet recording device is a well-known device that has already been put into practical use. Therefore, other explanations regarding this will be omitted.

(2) The inkjet recording apparatus 10 includes a heating device 50 (see FIGS. 1 to 5). The heating device 50 includes a first heater 51 and a second heater 52. The first heater 51 is provided on the first side in the first direction with respect to the recording medium 15 being conveyed in the first region R1, and the first heater 51 is provided on the first side in the first direction with respect to the recording medium 15 being conveyed in the first region R1. Heat from the surface side (see Figure 2). The second heater 52 is provided on the first side in the first direction with respect to the recording medium 15 being conveyed in the second region R2, and is configured to heat the recording medium 15 conveyed in the second region R2 by Heat from the surface side (see Figure 3). The heating device 50 (one or both of the first heater 51 and the second heater 52) for the recording medium 15 may be arranged differently from the above. The arrangement of the heating device 50 with respect to the recording medium 15 is appropriately determined in consideration of various conditions.

The heating device 50 (the first heater 51 and the second heater 52) may be omitted, or one of the first heater 51 and the second heater 52 may be omitted. In addition, the inkjet recording apparatus 10 may be provided with a heating device separate from the heating device 50. For example, a heating device different from the heating device 50 heats the recording medium 15 before being carried into the inkjet recording apparatus 10. In this case, the recording medium 15 heated by a heating device different from the heating device 50 is placed on the support table 23 . The conveyance machine 20 conveys the recording medium 15 heated by this other heating device in the conveyance direction.

(3) In the inkjet recording apparatus 10, the following control is performed in addition to or in place of the above-mentioned control, depending on the concentration or amount per unit volume of the evaporated component of the organic solvent of the ink detected by the detector 60. It may also be executed. In this case, the inkjet recording apparatus 10 includes an alarm. Examples of alarms include warning lights and speakers. When "detected value>reference value" or "detected value≧reference value", the alarm performs the alarm operation. By this notification operation, it is possible to notify that "detected value>reference value" or "detected value≧reference value".

(4) The inkjet recording apparatus 10 is provided with one detector 60 (see FIGS. 1 to 5). The inkjet recording apparatus 10 may be provided with a plurality of detectors 60. When a plurality of detectors 60 are provided, the arrangement of the plurality of detectors 60 is appropriately determined in consideration of various conditions. However, at least one detector 60 is provided below (on the second side in the first direction) the recording medium 15 that is being conveyed through the recording area R0 by the conveyor 20. Further, it is preferable that this at least one detector 60 is provided downstream of the most upstream end of the recording area R0 in the transport direction. The number of detectors 60 provided at such positions may be two or more. In this case, the arrangement of the two or more detectors 60 is also appropriately determined in consideration of various conditions.

10 inkjet recording device, 15 recording medium, 20 conveyance machine, 21 stator, 22 mover, 23 support stand, 30Y, 30M, 30C, 30K inkjet head, 31 nozzle, 32 first nozzle, 33 second nozzle, 40 carriage, 50 heating Apparatus 51 first heater, 52 second heater, 60 detector, 65 stay 70 cover, 71 front, 72 loading port, 73 back side, 74 loading port 75 exhaust port, 80 suction device, N nozzle row, N1 first Nozzle row N2 second nozzle row, R0 recording area, R1 first area, R2 second area T transport path, W width

Claims (4)

An inkjet recording device that conveys a recording medium and records a pattern on the recording medium,
a conveyance machine that conveys the recording medium;
an inkjet head that ejects ink from a plurality of nozzles onto the recording medium being transported by the transporting machine;
a detector that detects an evaporated component of the organic solvent of the ink,
The detector is provided below the recording medium being conveyed through a recording area where the inkjet head is provided on a conveyance path through which the recording medium is conveyed by the conveyor ,
In the inkjet recording device, the evaporated component of the organic solvent of the ink is sucked by a suction device,
The inkjet head includes:
When the detection value of the evaporated component of the organic solvent of the ink detected by the detector is lower than a reference value predetermined as an upper limit of the detection value, the ejection of the ink from the plurality of nozzles is set to a first state. ,
If the detected value is higher than the reference value, the inkjet recording apparatus enters a second state in which ejection of the ink from the plurality of nozzles is stopped or reduced compared to the first state. The inkjet recording apparatus according to claim 1, wherein the detector is provided on the downstream side of the most upstream end of the conveyance path in the recording area in the conveyance direction in which the recording medium is conveyed. 3. The inkjet recording apparatus according to claim 1, wherein the detector detects the concentration or amount per unit volume of the evaporated component of the organic solvent of the ink. The inkjet recording apparatus according to any one of claims 1 to 3, wherein the plurality of nozzles are arranged in a direction perpendicular to a conveyance direction in which the recording medium is conveyed through the conveyance path.

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