JP2023059579A - Liquid discharge device, exhaust method, and program - Google Patents

Abstract

To provide a liquid discharge device, an exhaust method and a program which can improve the heat discharge efficiency without increasing a cost by utilizing a mechanism that adsorbs an existing base material.SOLUTION: A liquid discharge device acquires an ambient temperature (Tj) of a liquid discharge head from a head temperature sensor, acquires an indoor temperature (Te) from an indoor temperature sensor for detecting the indoor temperature being the internal temperature of a device arrangement chamber, exhausts the gas around the liquid discharge head to the outside of the device arrangement chamber by operating an adsorption support device when the ambient temperature of the liquid discharge head is equal to or greater than a prescribed ambient threshold temperature (Tth) (Tth≤Tj) in the non-printing state and the ambient temperature of the liquid discharge head exceeds the indoor temperature (Tj>Te), and introduces the gas in the device arrangement chamber to the periphery of the liquid discharge head.SELECTED DRAWING: Figure 5

Description

The present invention relates to a liquid ejection device, an exhaust method, and a program.

In an inkjet printing apparatus, when the temperature inside the apparatus rises, and in particular when the temperature of the inkjet head rises due to the temperature rise inside the apparatus, there is concern that problems related to the inkjet head, such as condensation on the nozzle surface of the inkjet head, may occur. be. For example, if dew condensation occurs on the nozzle surface of the inkjet head, the ejection state may change, and the quality of the printed image may deteriorate.

In the case of adopting a configuration for maintaining the temperature inside the device within a certain range by providing an exhaust mechanism, a cooling mechanism, etc., as a countermeasure against the rise in the ambient temperature of the inkjet head, there is a concern that the cost of the device will increase.

Patent Document 1 describes an inkjet printer including a head assembly in which a plurality of recording heads are arranged in a zigzag pattern. The apparatus described in the document has air intakes arranged between the print heads, and humid air is exhausted to the outside of the apparatus through the air intakes.

Japanese Patent Application Laid-Open No. 2002-200002 describes a printing apparatus equipped with a temperature control liquid circulation system that cools a frame member of a head. The temperature control liquid circulation system described in the document includes a temperature control liquid supply manifold disposed downstream of each head unit in the sheet conveying direction. The device described in the document stably maintains the temperature of the temperature control liquid supply manifold at a specified temperature, and even if the surrounding relative temperature rises, condensation on the temperature control liquid supply manifold prevents the increase in relative humidity. to prevent condensation on the nozzle surface.

JP 2010-167573 A Japanese Patent Application Laid-Open No. 2021-24270

However, the device described in Patent Document 1 requires a space for arranging the intake port, and there are concerns about an increase in the size of the head assembly and an increase in the cost of the device. The device described in Patent Document 2 is equipped with a temperature control liquid circulation system such as a temperature control liquid supply manifold, and there is concern about an increase in the cost of the device.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances. intended to provide

A liquid ejection apparatus according to the present disclosure is a liquid ejection apparatus that ejects liquid, and includes a liquid ejection head that ejects liquid onto a substrate, an adsorption support device that applies negative pressure to the substrate to adsorb and support the substrate, and an adsorption support device. A relative movement device for relatively moving a substrate and a liquid ejection head that are adsorbed and supported using a support device, and a gas discharged from the adsorption support device is discharged to the outside of a device arrangement chamber in which the liquid ejection device is arranged. At least one processor, comprising: a gas flow path; a head temperature sensor that detects the ambient temperature of the liquid ejection head; at least one processor; executes a program to acquire the ambient temperature of the liquid ejection head from the head temperature sensor, acquires the room temperature from the room temperature sensor that detects the room temperature, which is the internal temperature of the device installation room, and in a non-printing state, When the ambient temperature of the liquid ejection head is equal to or higher than the specified ambient threshold temperature and the ambient temperature of the liquid ejection head exceeds the room temperature, the suction support device is operated to dispose the gas around the liquid ejection head. It is a liquid ejection device that discharges gas to the outside of the chamber and introduces the gas inside the device installation chamber to the periphery of the liquid ejection head.

According to the liquid ejection apparatus according to the present disclosure, when the ambient temperature of the liquid ejection head is equal to or higher than the specified ambient threshold temperature and the ambient temperature of the liquid ejection head exceeds the internal temperature of the apparatus installation chamber, Then, the suction support device is operated to discharge the gas around the liquid ejection head to the outside of the device placement chamber, and introduce the gas inside the device placement chamber to the periphery of the liquid ejection head. As a result, the existing mechanism for adsorbing the base material can be used to improve the heat exhaust efficiency without increasing the cost.

A liquid ejecting apparatus according to another aspect may include a gas intake port for introducing gas inside the apparatus arrangement chamber into the liquid ejecting apparatus.

According to this aspect, it is possible to introduce the gas inside the device arrangement chamber having a temperature lower than the ambient temperature of the liquid ejection head into the interior of the liquid ejection device via the gas intake port.

A liquid ejecting apparatus according to another aspect includes a room temperature sensor that detects the temperature of the apparatus installation chamber, and the room temperature sensor detects the temperature of the gas taken into the liquid ejecting apparatus from the gas intake port. good.

According to this aspect, the temperature of the gas taken into the device through the gas intake port can be grasped as the room temperature. Also, the temperature outside the liquid ejecting apparatus can be detected using an indoor temperature sensor provided inside the liquid ejecting apparatus.

In a liquid ejection apparatus according to another aspect, at least one processor obtains the temperature of the liquid to be ejected from the liquid ejection head, and if the temperature of the liquid satisfies a specified condition, operates the adsorption support device to The gas around the ejection head may be discharged to the outside of the device placement chamber, and the gas inside the device placement chamber may be introduced around the liquid ejection head.

According to this aspect, it is possible to exhaust the liquid ejection device according to the temperature of the liquid.

A liquid ejecting apparatus according to another aspect includes a liquid temperature sensor that detects the temperature of the liquid, and at least one processor acquires the temperature of the liquid from the liquid temperature sensor, and determines that the temperature of the liquid satisfies a prescribed condition. When the temperature of the liquid exceeds the specified liquid threshold temperature or when the temperature of the liquid is lower than the ambient temperature of the liquid ejection head, the suction support device is operated to remove the gas inside the liquid ejection device from the outside of the device placement chamber. may be discharged to

According to this aspect, when the liquid temperature detected by the liquid temperature sensor exceeds the specified liquid threshold temperature or is lower than the ambient temperature of the liquid ejection head, the inside of the liquid ejection device is exhausted. obtain. This can suppress the occurrence of dew condensation on the liquid ejection head.

In a liquid ejection apparatus according to another aspect, the liquid temperature sensor may be arranged in a liquid reservoir in which liquid to be supplied to the liquid ejection head is stored.

According to this aspect, the inside of the liquid ejection device can be exhausted based on the temperature of the liquid supplied to the liquid ejection head.

A liquid ejection apparatus according to another aspect includes a liquid temperature setting unit that sets a target temperature of liquid to be ejected from the liquid ejection head, and at least one processor sets the target temperature of the liquid to be set using the liquid temperature setting unit. If the temperature of the liquid satisfies a specified condition, and if the temperature of the liquid is lower than the ambient temperature of the liquid ejection head, the suction support device is operated to remove the gas inside the liquid ejection device. It may be discharged to the outside of the arrangement room.

According to this aspect, the inside of the liquid ejecting apparatus can be exhausted based on the target temperature setting value of the liquid.

In a liquid ejection apparatus according to another aspect, the at least one processor may not perform the determination based on the temperature of the liquid when the temperature of the liquid ejected from the liquid ejection head is maintained within a specified range.

According to this aspect, when the temperature of the liquid is maintained within the specified range, the inside of the liquid ejection device can be evacuated regardless of the temperature of the liquid.

As an example of the case where the temperature of the liquid is maintained within a specified range, there is a case where the liquid is circulated using the external flow path of the liquid ejection head.

In a liquid ejection apparatus according to another aspect, the head temperature sensor may be arranged on a head support member that supports the liquid ejection head.

In this aspect, the head support member can be included in a head moving mechanism that moves the liquid ejection head.

In a liquid ejector according to another aspect, at least one processor may obtain an ambient threshold temperature.

According to this aspect, the ambient threshold temperature can be applied according to various conditions applied to the liquid ejection device.

In the liquid ejecting apparatus according to another aspect, the at least one processor disables the adsorption support device or stops the operation of the adsorption support device when the ambient temperature of the liquid ejection head is equal to or lower than the room temperature. good.

According to this aspect, it is possible to avoid the inflow of the relatively high-temperature gas in the apparatus installation chamber into the inside of the apparatus.

An exhaust method according to the present disclosure is an exhaust method applied to a liquid ejecting apparatus that ejects liquid, in which a computer causes a head temperature sensor that detects the ambient temperature of a liquid ejecting head to eject liquid onto a substrate. The ambient temperature of the ejection head is acquired, the room temperature is acquired from a room temperature sensor that detects the room temperature, which is the internal temperature of the device installation chamber in which the liquid ejection device is arranged, and the ambient temperature of the liquid ejection head is obtained in a non-printing state. is equal to or higher than a specified ambient threshold temperature, and the ambient temperature of the liquid ejection head exceeds the room temperature, an adsorption support that adsorbs and supports the substrate by applying negative pressure to the substrate when conveying the substrate. In this exhaust method, the device is operated to exhaust the gas around the liquid ejection head to the outside of the device installation chamber, and introduce the gas inside the device installation chamber to the periphery of the liquid ejection head.

According to the exhaust method according to the present disclosure, it is possible to obtain the same effects as the liquid ejection device according to the present disclosure. Components of liquid ejection apparatuses according to other aspects can be applied to components of exhaust methods according to other aspects.

A program according to the present disclosure is a program applied to a liquid ejection apparatus that ejects liquid, and is a liquid ejection head that causes a computer to eject liquid onto a substrate from a head temperature sensor that detects the ambient temperature of the liquid ejection head. A function to acquire the ambient temperature of the liquid ejection head, a function to acquire the room temperature from a room temperature sensor that detects the room temperature, which is the internal temperature of the device installation chamber in which the liquid ejection device is arranged, and a function to acquire the room temperature When the temperature is equal to or higher than the specified ambient threshold temperature and the ambient temperature of the liquid ejection head exceeds the room temperature, negative pressure is applied to the substrate to adsorb and support the substrate when the substrate is conveyed. This is a program that realizes a function of operating the support device to discharge the gas around the liquid ejection head to the outside of the device placement chamber and introduce the gas inside the device placement chamber to the periphery of the liquid ejection head.

According to the program according to the present disclosure, it is possible to obtain effects similar to those of the liquid ejection device according to the present disclosure. Components of liquid ejection devices according to other aspects may be applied to components of programming methods according to other aspects.

According to the present invention, when the ambient temperature of the liquid ejection head is equal to or higher than the specified ambient threshold temperature and the ambient temperature of the liquid ejection head exceeds the internal temperature of the apparatus installation chamber, the suction support device is removed. When operated, the gas inside the device is discharged to the outside of the device installation chamber, and the relatively low-temperature internal gas of the device installation chamber is introduced to the periphery of the liquid ejection head. As a result, it is possible to improve the heat exhaust efficiency without increasing the cost by using the existing mechanism for adsorbing the base material.

FIG. 1 is a perspective view showing the appearance of an inkjet printing apparatus according to an embodiment. FIG. 2 is an overall configuration diagram showing a schematic configuration of the inkjet printing apparatus shown in FIG. FIG. 3 is a schematic diagram of an exhaust method applied during non-printing. FIG. 4 is a schematic diagram when the indoor temperature is higher than the jetting area temperature. FIG. 5 is a flow chart showing the procedure of the exhaust method according to the embodiment. FIG. 6 is a functional block diagram showing the electrical configuration of the inkjet printer shown in FIG. FIG. 7 is a block diagram showing a hardware configuration example of the inkjet printing apparatus shown in FIG. FIG. 8 is a perspective view showing a configuration example of a print drum. 9 is a partially enlarged view of the outer peripheral surface of the print drum shown in FIG. 8. FIG. FIG. 10 is a sectional view showing the three-dimensional structure of the print drum shown in FIG. FIG. 11 is a perspective view showing a configuration example of an inkjet head. FIG. 12 is a perspective view of the head module including a partial cross-sectional view. FIG. 13 is a sectional view showing the internal structure of the head module. FIG. 14 is a perspective view showing a schematic configuration of the head maintenance section. FIG. 15 is a block diagram showing a configuration example of an ink supply unit.

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In this specification, the same components are denoted by the same reference numerals, and overlapping descriptions are omitted as appropriate.

[Configuration example of inkjet printer]
〔exterior〕
FIG. 1 is a perspective view showing the appearance of an inkjet printing apparatus according to an embodiment. An inkjet printing apparatus 10 shown in the figure applies an inkjet method to print an image on a sheet of paper. The inkjet printing apparatus 10 includes a paper supply section 12 , a treatment liquid application section 14 , a treatment liquid drying section 16 , a printing section 18 , an ink drying section 20 , a paper discharge section 24 and a head maintenance section 26 .

The inkjet printing device 10 is entirely covered with a cover 28 . The cover 28 has a structure divided corresponding to each part such as the printing part 18, and the cover 28 can be removed for each divided unit.

A cover 28A corresponding to the printing unit 18 is provided with an intake port 28C on a ceiling surface 28B. The air in the room where the inkjet printing device 10 is arranged is drawn into the inkjet printing device 10 via the intake port 28C, an intake port (not shown), and a gap. Note that the intake port 28C described in the embodiment is an example of a gas intake port.

FIG. 2 is an overall configuration diagram showing a schematic configuration of the inkjet printing apparatus shown in FIG. 1, the illustration of the head maintenance section 26 shown in FIG. 1 is omitted, and the details of the head maintenance section 26 will be described later. Each part will be described in detail below.

[Paper feed section]
The paper feed unit 12 includes a paper feed table 30 , a sucker device 32 , a pair of paper feed rollers 34 , a feeder board 36 , a front support 38 and a paper feed drum 40 . Feeder board 36 includes retainer 36A and guide rollers 36B.

The retainer 36A and the guide roller 36B are arranged on the transport surface of the feeder board 36 on which the sheet S is transported. A front pad 38 is positioned between the feeder board 36 and the paper feed drum 40 .

The paper feed drum 40 has a cylindrical shape whose longitudinal direction is parallel to the rotating shaft 40B, and has a length exceeding the total length of the paper S in the longitudinal direction. The direction of the rotating shaft 40B of the paper feed drum 40 is the direction that penetrates the plane of FIG.

Here, the drum is a conveying member having a cylindrical shape that holds at least a portion of the medium and rotates it about the central axis of the cylindrical shape, thereby conveying the medium along the outer peripheral surface of the cylindrical shape. is.

The paper feed drum 40 has a gripper 40A. Gripper 40A includes a plurality of pawls, pawls and gripper shafts. Illustration of a plurality of claws, a claw base and a gripper shaft is omitted.

A plurality of claws of the gripper 40A are arranged along a direction parallel to the rotating shaft 40B, and the proximal end is supported swingably on the gripper shaft. The arrangement interval of the plurality of claws and the length of the area where the plurality of claws are arranged are determined according to the size of the sheet S. As shown in FIG.

The paper feeding unit 12 feeds the sheets S stacked on the paper feeding table 30 one by one to the treatment liquid applying unit 14 . The paper sheets S stacked on the paper feed table 30 are picked up one by one from the top by using the sucker device 32 and fed to the paper feed roller pair 34 .

The paper S fed to the paper feed roller pair 34 is placed on the feeder board 36 and transported using the feeder board 36 . The sheet S is pressed against the conveying surface of the feeder board 36 using the retainer 36A and the guide roller 36B, and unevenness is corrected. The leading edge of the sheet S is brought into contact with the front support 38 to correct the inclination thereof, and the sheet S is transferred to the sheet feed drum 40 .

The leading edge of the paper S transferred to the paper feed drum 40 is gripped by the gripper 40A. When the paper supply drum 40 is rotated, the paper S is transported along the outer peripheral surface of the paper supply drum 40 . The paper S is sent from the paper feed drum 40 to the treatment liquid applying section 14 . Alternatively, the paper supply drum 40 may be omitted, and the paper S may be sent directly from the feeder board 36 to the treatment liquid applying section.

[Treatment liquid application unit]
The treatment liquid deposition unit 14 includes a treatment liquid drum 42 and a treatment liquid deposition device 44 . The processing liquid drum 42 is provided with a gripper 42A. A configuration similar to that of the gripper 40A of the paper feed drum 40 can be applied to the gripper 42A.

The processing liquid drum 42 has a diameter twice that of the feed drum 40 . The processing liquid drum 42 has two grippers 42A. The two grippers 42A are arranged at positions shifted by half a circumference on the outer peripheral surface 42C of the processing liquid drum 42. As shown in FIG.

42 C of outer peripheral surfaces of the process liquid drum 42 are provided with several suction holes as a structure which fixes the paper S. FIG. The negative pressure generated in the plurality of suction holes functions as suction pressure for fixing the sheet S to the outer peripheral surface 42C. Reference numeral 42B denotes a rotating shaft of the treatment liquid drum 42. As shown in FIG.

A roller application method is applied to the treatment liquid applying device 44 . That is, the treatment liquid deposition device 44 may employ a configuration including a treatment liquid tank in which the treatment liquid is stored, a measuring roller for measuring the treatment liquid, and an application roller for applying the measured treatment liquid to the paper S. FIG.

The treatment liquid drum 42 rotates the treatment liquid drum 42 while gripping the leading edge of the sheet S using the gripper 42A, and conveys the sheet S along the outer peripheral surface 42C of the treatment liquid drum 42. FIG. The paper S is applied with the treatment liquid using the treatment liquid applying device 44 . The paper S to which the treatment liquid has been applied is sent to the treatment liquid drying section 16 .

The treatment liquid has a function of aggregating the colorant of the ink used for printing or a function of insolubilizing the colorant of the ink. The ink in contact with the treatment liquid does not cause landing interference or the like even when general-purpose paper is used, and the inkjet printing apparatus 10 can perform high-quality printing.

[Treatment liquid drying section]
The treatment liquid drying section 16 includes a treatment liquid drying drum 46 , a paper transport guide 48 and a treatment liquid drying unit 50 . The processing liquid drying drum 46 is provided with a gripper 46A. A configuration similar to that of the gripper 40A of the paper feed drum 40 can be applied to the gripper 46A.

The processing liquid drying drum 46 differs from the processing liquid drum 42 in that it does not have an adsorption support structure for the processing liquid drum 42, and has the same configuration as the processing liquid drum 42 in other respects. Reference numeral 46B denotes a rotating shaft of the treatment liquid drying drum 46. As shown in FIG.

The paper transport guide 48 is located at a position facing the outer peripheral surface 46</b>C of the treatment liquid drying drum 46 and below the treatment liquid drying drum 46 . The paper transport guide 48 guides the paper S to be transported using the paper transport guide 48 .

The processing liquid drying unit 50 is arranged inside the processing liquid drying drum 46 . The processing liquid drying unit 50 includes a blowing section that blows air toward the outside of the processing liquid drying drum 46 and a heating section that heats the air. For convenience of illustration, the reference numerals of the air blowing section and the heating section are omitted.

The paper S sent from the treatment liquid applying unit 14 to the treatment liquid drying unit 16 is gripped at the leading end by the gripper 46A of the treatment liquid drying drum 46, and the surface coated with the treatment liquid is moved by the paper transport guide 48. is supported on the opposite side of the When the paper S is supported by the paper transport guide 48 , the surface coated with the treatment liquid faces the outer peripheral surface 46</b>C of the treatment liquid drying drum 46 .

The paper S supported by the treatment liquid drying drum 46 is transported along the outer peripheral surface 46C of the treatment liquid drying drum 46 as the treatment liquid drying drum 46 rotates, and the heated air from the treatment liquid drying unit 50 is conveyed. It is sprayed and dried.

When the paper S is dried, the solvent component in the treatment liquid applied to the paper S is removed, and a treatment liquid layer is formed on the surface of the paper S to which the treatment liquid is applied. The paper S that has undergone the drying process is sent to the printing section 18 .

[Printing Department]
The printing section 18 includes a print drum 52 and a paper pressing roller 54 . The printing unit 18 includes an inkjet head 56C, an inkjet head 56M, an inkjet head 56Y, an inkjet head 56K, and an in-line sensor 58. The print drum 52 has a gripper 52A.

The gripper 52A is arranged inside a recess provided in the outer peripheral surface 52C of the print drum 52. As shown in FIG. A configuration similar to that of the gripper 40A of the paper feed drum 40 can be applied to configurations other than the arrangement of the gripper 52A.

The printing drum 52 differs from the processing liquid drum 42 in that a gripper 52A is arranged in a recessed portion of the outer peripheral surface 52C, and has the same configuration as the processing liquid drum 42 in other respects. Incidentally, reference numeral 52B denotes a rotating shaft of the printing drum 52. As shown in FIG.

The print drum 52 has suction holes on the outer peripheral surface 52C that supports the paper S. As shown in FIG. The suction holes are arranged in a medium support area for supporting the paper S by suction. It should be noted that illustration of the suction holes and the medium support area is omitted in FIG. The suction holes are shown in FIG. 9 at 310 .

The paper pressing roller 54 has a cylindrical shape and is arranged with its longitudinal direction parallel to the rotating shaft 52B of the printing drum 52 . The paper pressing roller 54 has a total length in the longitudinal direction that exceeds the total length of the paper S in the width direction. The paper pressing roller 54 is positioned downstream of the delivery position of the paper S in the transport direction of the paper S on the print drum 52 and upstream of the inkjet head 56C.

The width direction of the paper S is a direction orthogonal to the transport direction of the paper S and a direction parallel to the transport surface of the paper S. As shown in FIG. The width direction of the paper S supported by the print drum 52 is parallel to the direction of the rotating shaft 52B and the longitudinal direction of the print drum 52 . Hereinafter, the transport direction of the paper S may be referred to as the transport direction, and the width direction of the paper S may be referred to as the paper width direction.

Here, "parallel" may include "substantially parallel" that has the same effects as "parallel" even when two directions intersect each other. In addition, the concept of substantially parallel can also include the case where the two directions are intentionally crossed slightly in consideration of transport conditions and the like. Similarly, orthogonal may include substantially orthogonal.

The inkjet head 56C, the inkjet head 56M, the inkjet head 56Y, and the inkjet head 56K are provided with a plurality of nozzle portions for ejecting ink. In addition, illustration of the nozzle portion is omitted in FIG. 2 . The nozzle portion is illustrated in FIG. 13 using reference numerals. The alphabet attached to the reference numeral of the inkjet head represents the color of the ink. C represents cyan, M represents magenta, Y represents yellow, and K represents black.

The inkjet head 56C, the inkjet head 56M, the inkjet head 56Y, and the inkjet head 56K are arranged above the print drum 52 . The inkjet head 56C, the inkjet head 56M, the inkjet head 56Y, and the inkjet head 56K are arranged in the order described above from the upstream side along the paper transport direction.

Each of the inkjet head 56C, the inkjet head 56M, the inkjet head 56Y, and the inkjet head 56K is supplied with ink from an ink supply device for each head. Details of the ink supply device will be described later.

The in-line sensor 58 is arranged at a position downstream of the inkjet head 56K in the paper transport direction. The in-line sensor 58 includes an imaging device, a peripheral circuit for the imaging device, and a light source.

Solid-state imaging devices such as CCD image sensors and CMOS image sensors can be applied to the imaging devices. The light source is arranged at a position capable of irradiating illumination light onto an object to be read by the in-line sensor. An LED (light emitting diode), a lamp, or the like can be applied as the light source.

Note that illustration of an imaging device, peripheral circuits of the imaging device, and a light source is omitted. CCD is an abbreviation for Charge Coupled Device. CMOS is an abbreviation for Complementary Metal-Oxide Semiconductor.

The leading edge of the paper S sent from the treatment liquid drying section 16 to the printing section 18 is gripped by the gripper 52A of the printing drum 52 . The paper S, the leading edge of which is gripped by the gripper 52A of the print drum 52, is transported along the outer peripheral surface 52C of the print drum 52 due to the rotation of the print drum 52. FIG.

The paper S is pressed against the outer peripheral surface 52C of the print drum 52 when passing under the paper pressing roller 54 . The paper S that has passed under the paper pressing roller 54 causes color ink to be ejected from each of the inkjet heads 56C, 56M, 56Y, and 56K directly below the inkjet heads.

The paper S printed by the inkjet head 56C, the inkjet head 56M, the inkjet head 56Y, and the inkjet head 56K is sent to the reading area of the in-line sensor 58 . The in-line sensor 58 reads the printed image on the paper S and outputs a read signal. The read signal of the printed image is applied to detection of an ejection failure of the inkjet head 56 and the like. The paper S on which the print image has been read using the in-line sensor 58 is sent from the printing section 18 to the ink drying section 20 .

The inkjet head 56 is a general term for the inkjet head 56C, the inkjet head 56M, the inkjet head 56Y, and the inkjet head 56K. Inkjet heads 56C and the like may be referred to as inkjet heads 56 when there is no need to distinguish between them.

[Ink drying part]
The ink drying section 20 has a chain gripper 64 , an ink drying unit 68 and a guide plate 72 . The chain gripper 64 comprises a first sprocket 64A, a second sprocket 64B, a chain 64C and a plurality of grippers 64D.

The chain gripper 64 has a structure in which an endless chain 64C is wound around each of a pair of first sprockets 64A and 64A. FIG. 1 shows only one of the pair of first sprocket 64A and second sprocket 64B. Also, illustration of the chain 64C wound around the other first sprocket 64A and second sprocket 64B is omitted.

The chain gripper 64 has a structure in which a plurality of grippers 64D are arranged between a pair of chains 64C, and the plurality of grippers 64D are arranged at a plurality of positions in the paper transport direction. FIG. 1 shows only one gripper 64D among a plurality of grippers 64D arranged between a pair of chains 64C.

The ink drying unit 68 is arranged above the transport path of the paper S in the chain gripper 64 . A configuration example of the ink drying unit 68 includes a configuration including a heat source such as a halogen heater and an infrared heater. Another configuration example of the ink drying unit 68 includes a configuration including a fan that blows air heated by a heat source onto the paper S. FIG. Ink drying unit 68 may employ a configuration that includes a heat source and a fan.

A plate-shaped member is applied to the guide plate 72 . The guide plate 72 has a length exceeding the total length of the paper S in the direction orthogonal to the paper transport direction. Note that illustration of the detailed structure of the guide plate 72 is omitted.

The guide plate 72 is arranged along the transport path of the paper S using the chain gripper 64 . The guide plate 72 is arranged below the transport path of the paper S using the chain gripper 64 . The guide plate 72 may have a function of supporting the sheet S by suction.

The paper S sent from the printing unit 18 to the ink drying unit 20 is gripped at the leading end by using the gripper 64D. The chain gripper 64 rotates at least one of the first sprocket 64A and the second sprocket 64B clockwise in FIG. 1 to run the chain 64C, thereby transporting the paper S along the running path of the chain 64C.

When the paper S passes through the processing area of the ink drying unit 68, the paper S is subjected to ink drying processing. The paper S on which the ink drying process has been performed is sent to the paper discharge section 24 .

The guide plate 73 supports the paper S when the chain gripper 64 is used to transport the paper S diagonally upward to the left. The guide plate 73 can apply members similar to those of the guide plate 72 and have similar functions. Here, description of the structure and function of the guide plate 73 is omitted.

[Paper output section]
The paper discharge section 24 includes a paper discharge table 76 . A chain gripper 64 is applied to transport the sheet S in the sheet discharge section 24 .

The paper discharge table 76 is arranged at a position below the transport path of the paper S using the chain gripper 64 . The paper discharge table 76 has an elevating mechanism, and can be raised and lowered according to the increase or decrease in the number of stacked sheets S to maintain the height of the topmost sheet S at a constant level.

The paper discharge unit 24 collects the printed paper S. When the sheet S reaches the position of the sheet discharge table 76 , the gripper 64 D releases the grip of the sheet S, and the sheet S is stacked on the sheet discharge table 76 .

Although the inkjet printing apparatus 10 including the treatment liquid applying unit 14 and the treatment liquid drying unit 16 is shown in the present embodiment, an aspect in which the treatment liquid applying unit 14 and the treatment liquid drying unit 16 are omitted is also possible.

In the present embodiment, the chain gripper 64 is used as a configuration for transporting the paper S after printing. obtain.

Note that the paper S described in the embodiment is an example of the base material. The ink described in the embodiments is an example of liquid. The inkjet head 56 described in the embodiment is an example of a liquid ejection head. The inkjet printing device 10 described in the embodiment is an example of a liquid ejection device.

Also, the rotation direction of the print drum 52 described in the embodiment is an example of the relative movement direction. The print drum 52 described in the embodiment is an example of a component of the relative movement device. The structure for sucking and supporting the paper S applied to the print drum 52 of the embodiment is an example of the sucking support device.

[Explanation of exhaust method using printing drum]
FIG. 3 is a schematic diagram of the exhaust method applied in the non-printing state. FIG. 3 schematically shows the inkjet printing device 10 arranged in the device arrangement chamber 80. As shown in FIG. In FIG. 3, illustration of components of the inkjet printing apparatus 10 other than the printing unit 18 is omitted, and illustration of components of the printing unit 18 such as the inkjet head 56 is omitted as appropriate.

Inside the print drum 52, an internal flow path is formed that communicates with the suction holes arranged on the outer peripheral surface 52C. The internal channel communicates with the pump connection port 52D. The pump connection port 52D is connected to the device exhaust port 84 via the pump channel 82. As shown in FIG. A suction pump 83 is connected to the pump flow path 82 . The device exhaust port 84 communicates with an exhaust port 88 via a duct 86 arranged in the device placement chamber 80 . The illustration of the internal flow path of the print drum 52 is omitted.

The printing unit 18 includes a temperature sensor 90 near the intake port 28C shown in FIG. A temperature sensor 90 detects the temperature of the air introduced into the printing section 18 through the air inlet 28C. The temperature of the air introduced into the printing section 18 through the air inlet 28C can be regarded as the room temperature _Te , which is the internal temperature of the device installation room 80. FIG. Of course, the temperature sensor 90 may be arranged outside the inkjet printing apparatus 10 and inside the apparatus arrangement chamber 80 . Note that the temperature sensor 90 described in the embodiment is an example of an indoor temperature sensor.

When the ink jet printing device 10 is in a non-printing state and satisfies a prescribed temperature condition, the suction pump 83 is operated to suck the air inside the printing section 18, and the air in the device arrangement chamber 80 is removed from the printing section 18. taken into the interior of A downward arrow line shown in FIG.

The sucked air inside the printing unit 18 is discharged to the outside of the printing drum 52 through the pump connection port 52D, and is arranged outside the device installation chamber 80 from the exhaust port 88 via the device exhaust port 84 and the duct 86. . The upwardly pointing arrow line shown in FIG.

In the inkjet printing apparatus 10, the jetting area temperature _Tj in the printing unit 18, the room temperature _Te , and the threshold temperature _Tth are set and stored as parameters. The threshold temperature T _th can function as a dew condensation concern threshold temperature when there is concern about dew condensation on the inkjet head 56 . The room temperature T _e is synonymous with the environmental temperature of the inkjet printing apparatus 10 .

The jetting area is the area included in the printing section 18 and includes the area between the inkjet head 56 and the outer peripheral surface 52C of the print drum 52. FIG. The jetting area may include a region of the periphery of the inkjet head 56 where dew condensation may occur.

When T _th ≦T _j and T _j >T _e are satisfied, the inkjet printing apparatus 10 operates the suction pump 83 to suck and support the paper S regardless of whether printing is in progress. Operate the mechanism. In other words, the inkjet printing apparatus 10 operates the suction support mechanism for the paper S when the above temperature conditions are satisfied even in the non-printing state. When the ink temperature is T _ink , a case where T _th <T _ink is satisfied may be added as a temperature condition for operating the adsorption support mechanism for the paper S. FIG.

As a result, the relatively high-temperature air of the printing section 18 is discharged through the suction holes of the print drum 52 , the internal flow path, the pump flow path 82 , the device exhaust port 84 , the duct 86 and the exhaust port 88 to the device placement chamber 80 . is discharged to the outside of the In addition, relatively low-temperature air in the apparatus arrangement chamber 80 is introduced into the printing section 18 from the intake port 28C shown in FIG. As a result, the temperature of the printing unit 18 can be lowered, and dew condensation on the inkjet head 56 can be suppressed.

FIG. 4 is a schematic diagram when the indoor temperature is higher than the jetting area temperature. When the relationship between the jetting area temperature T _j and the room temperature T _e satisfies T _j ≤ T _e , when the suction pump 83 is operated in the non-printing state and the suction support mechanism for the paper S is operated, the temperature is relatively high. of air is introduced into the printing unit 18, and there is concern about dew condensation on the inkjet head 56.

Therefore, when the relationship between the jetting area temperature _Tj and the room temperature _Te satisfies Tj _{≦ Te} , the suction support mechanism for the paper S is not operated in the non-printing state, and the paper S is supported by suction during printing. Operate the mechanism. As a result, in the non-printing state, the introduction of air into the printing section 18 in the device arrangement chamber 80 is avoided, and the temperature rise of the printing section 18 caused by the introduction of air into the printing section 18 in the device arrangement chamber 80 is suppressed. , dew condensation on the inkjet head 56 can be suppressed.

The air inside the printing unit 18 described in the embodiment is an example of the gas inside the apparatus. The pump channel 82 and the duct 86 described in the embodiment are examples of gas channels. The ambient temperature of the liquid ejection head described in the embodiment is an example of the jetting area temperature _Tj .

Further, the threshold temperature T _th described in the embodiment is an example of the ambient threshold temperature, and when T _th ≦T _j is satisfied, it is an example of a case where the ambient temperature of the liquid ejection head is equal to or higher than the specified ambient threshold temperature. .

[Procedure of the exhaust method according to the embodiment]
FIG. 5 is a flow chart showing the procedure of the exhaust method according to the embodiment. The exhaust method whose procedure is shown in the figure can be implemented by the controller of the inkjet printing apparatus 10 shown in FIG. 1 etc. executing a program.

In the operating state determination step S10, it is determined whether the inkjet printer 10 is in the process of cycle-up or has received a print command. Cycle-up is a print preparation operation, and may include, for example, a process of adjusting the ink temperature to a specified temperature.

In the operation state determination step S10, if it is determined that the cycle-up is not being executed or the print command is not acquired, the determination is No. That is, in the operating state determination step S10, when it is determined that the operating state of the inkjet printer 10 is the non-printing state, the determination is No. In the case of No judgment, it progresses to threshold temperature judgment process S16.

On the other hand, if it is determined in the operating state determination step S10 that the cycle-up is in progress or that the print command has been acquired, the determination is Yes. That is, in the operation state determination step S10, if it is determined that the operation state of the inkjet printer 10 is in the printing state, the determination is Yes. In the case of Yes determination, it progresses to adsorption|suction process S12.

In the suction step S12, the suction pump 83 shown in FIG. When the adsorption step S12 is started, the process proceeds to the end determination step S14.

In the end determination step S14, it is determined whether or not to end printing or cycle-up. For example, when a command indicating the end of printing or cycle-up is acquired in the end determination step S14, it can be determined to end printing or cycle-up.

In the end determination step S14, if it is determined not to end printing or cycle-up, the determination is No. In the case of No determination, the adsorption step S12 and the termination determination step S14 are repeatedly performed until the determination is Yes in the termination determination step S14.

On the other hand, if it is determined in the termination determination step S14 that the printing or cycle-up is to be terminated, the determination is Yes. In the case of Yes determination, it progresses to threshold temperature determination process S16. When printing or cycle-up is finished, the operation of the suction support mechanism for the paper S may be stopped.

In the threshold temperature determination step S16, it is determined whether or not the relationship between the jetting area temperature _Tj and the threshold temperature _Tth satisfies _Tth ≦ _Tj . That is, in the threshold temperature determination step S16, it is determined whether or not the jetting area temperature _Tj is equal to or higher than the threshold temperature _Tth .

In the threshold temperature determination step _S16 , if the jetting area temperature _Tj is less than the threshold temperature Tth _and Tth> _Tj , the determination is No. If the determination is No, there is little concern that condensation will form on the inkjet head 56, and the process proceeds to the suction exhaust termination step S24.

_{On the other hand, in the threshold temperature determination step S16, if the relationship between the jetting area temperature Tj and the threshold temperature Tth satisfies Tth≦Tj , the determination} is Yes. If the determination is Yes, there is a concern that the ink jet head 56 will be dew-condensed, and the process proceeds to the room temperature determination step S18.

In the room temperature determination step S18, it is determined whether or not the relationship between the jetting area temperature T _j and the room temperature T _e satisfies T _j >T _e . That is, in the room temperature determination step S18, it is determined whether or not the jetting area temperature _Tj exceeds the room temperature _Te .

In the room temperature determination step S18, if the jetting area temperature _Tj is equal to or lower than the room temperature Te _{and Tj≤Te} is _satisfied , the determination is No. If the determination is No, it is difficult to introduce a relatively low-temperature gas into the printing unit 18, and the process proceeds to the adsorption and exhaust termination step S24.

On the other hand, in the room temperature determination step S18, if the jetting area temperature T _j exceeds the room temperature T _e and T _j >T _e is satisfied, the determination is Yes. In the case of Yes determination, it is possible to introduce a relatively low-temperature gas to the printing unit 18, and the process proceeds to the exhaust step S20. For example, when the jetting area temperature _Tj is 30° C. and the room temperature T _e is 28° C., the evacuation step S20 can be performed.

In the exhausting step S20, the operation of the suction pump 83 is continued or resumed, and the suction support mechanism of the print drum 52 is operated to suck the air inside the printing unit 18 to the print drum 52. , the relatively hot air inside the printing section 18 is discharged to the outside of the device placement chamber 80 via the exhaust port 88 shown in FIG. In the exhaust step S20, the print drum 52 may be rotated. Thereby, the entire printing unit 18 can be evacuated.

When the exhaust process S20 is started, the process proceeds to the jetting area temperature determination process S22, and it is determined whether or not the relationship between the jetting area temperature _Tj and the threshold temperature _Tth satisfies _Tth ≦ _Tj .

In the jetting area temperature determination step S22, when it is determined that the jetting area temperature _Tj is equal to or higher than the threshold temperature Tth _{and Tth≦Tj , the} determination is Yes. In the case of Yes determination, the process proceeds to room temperature determination step S18, and each step from room temperature determination step S18 to jetting area temperature determination step S22 is repeatedly executed until No determination is made in jetting area temperature determination step S22.

On the other hand, in the jetting area temperature determination step S22, if it is determined that the jetting area temperature _Tj is equal _{to or lower than the threshold temperature Tth and Tth≧Tj is satisfied} , the determination is No. If the determination is No, the process proceeds to the adsorption exhaust termination step S24.

In the suction exhaust end step S24, the operation of the suction pump 83 is ended, and the operation of the suction support mechanism of the print drum 52 is ended. After the adsorption/exhaust end step S24, a prescribed end process is performed, and the procedure of the exhaust method is ended.

For example, when T _th >T _j where the threshold temperature T _th is 28° C. and the jetting area temperature T _j is 25° C., the sheet S is adsorbed in the printing state during printing or cycle-up. The support mechanism is operated, the sheet S is suction-supported, and the operation of the suction-support mechanism is terminated after printing or cycle-up is completed.

When the jetting area temperature _Tj is 30° C. and the room temperature T _e is 28° C., the suction support mechanism for the paper S is operated regardless of whether printing is being performed or cycle-up is being performed. , the sheet S is sucked and supported during printing or cycle-up, and the printing section 18 is exhausted after printing or cycle-up is completed.

If the determination is Yes in the threshold temperature determination step S16, it is determined whether the relationship between the ink temperature T _ink and the threshold temperature T _th satisfies T _ink <T _th . You may proceed to S18. On the other hand, when the ink temperature _Tink is adjusted to within the specified range, the determination based on the ink temperature _Tink can be disabled. For example, when the ink is circulated using the external flow path of the inkjet head 56 and the ink temperature _Tink is adjusted to the target temperature, the determination based on the ink temperature _Tink may not be performed.

As for the threshold temperature _Tth , the jetting area temperature determination threshold temperature _Tthj and the ink temperature determination threshold temperature _Tthink may be set separately. The relationship between the jetting area temperature determination threshold temperature T _thj and the ink temperature determination threshold temperature T _think preferably satisfies T _thj >T _think .

Also, if the determination is Yes in the threshold temperature determination step S16, it is determined whether the relationship between the ink temperature T _ink and the jetting area temperature T _j satisfies T _ink <T _j . You may proceed to the indoor temperature determination step S18.

That is, based on the jetting area temperature _Tj and the ink temperature _Tink , the possibility of dew condensation on the inkjet head 56 is determined. may be implemented. If the ink temperature _Tink is constant, the threshold temperature _Tth may be determined according to the ink temperature _Tink .

In the exhaust method described above, the exhaust process S20 illustrated in FIG. 5 is performed when any one of the inkjet heads 56C, 56M, 56Y, and 56K illustrated in FIG. 2 satisfies the temperature conditions described above. You may

Note that the threshold temperature T _th and the ink temperature determination threshold temperature T _think described in the embodiment are examples of the liquid threshold temperature. A case where T _ink <T _j described in the embodiment is an example of a case where the temperature of the liquid is lower than the ambient temperature of the liquid ejection head.

The case where T _j ≦T _e described in the embodiment is satisfied is an example of the case where the ambient temperature of the liquid ejection head is equal to or lower than the room temperature. The end of the operation of the suction support mechanism for the print drum 52 in the suction exhaust end step S24 is an example of stopping the operation of the suction support device. A case in which the suction support mechanism for the paper S is not operated during non-printing described in the embodiment is an example of non-operation of the suction support device.

[Electrical Configuration of Inkjet Printer]
FIG. 6 is a functional block diagram showing the electrical configuration of the inkjet printer shown in FIG. The inkjet printer 10 includes a system controller 100 , a transport controller 102 , a treatment liquid application controller 104 , a print controller 106 , a drying controller 108 , an ink supply controller 110 , a head maintenance controller 111 and a memory 112 .

The system control unit 100 transmits command signals to each control unit such as the transport control unit 102 and uses various data stored in the memory 112 to centrally control the operation of the inkjet printing apparatus 10 .

The transport control unit 102 controls the operation of the transport unit 103 according to command signals transmitted from the system control unit 100 . The transport unit 103 shown in FIG. 2 includes transport members for transporting the paper S such as the paper supply drum 40, the processing liquid drum 42, the print drum 52 and the chain gripper 64 shown in FIG.

The transport controller 102 includes a drum drive controller 120 and a suction pump controller 122 . The drum drive control unit 120 controls the drum drive device 140 to drive the paper feed drum 40 and the like, and controls the start and stop of transport of the paper S and the transport speed. Here, the term velocity may include the concept of speed expressed as an absolute value of velocity.

The suction pump control unit 122 controls the operation of the suction pump 83 shown in FIG. Further, the suction pump control section 122 controls the operation of the suction pump 83 and controls the exhaust of the printing section 18 .

The treatment liquid application control unit 104 operates the treatment liquid application unit 14 according to a command signal transmitted from the system control unit 100 to control application of the treatment liquid to the paper S. FIG. The control of application of the treatment liquid includes control of the amount of application of the treatment liquid.

The print control unit 106 controls ejection of the inkjet head 56 provided in the printing unit 18 according to command signals transmitted from the system control unit 100 . The print control unit 106 includes an image processing unit and a drive voltage supply unit. The image processing unit includes a correction processing unit that performs color separation processing and color conversion processing on image data and performs various corrections, and a halftone image generation unit that generates a halftone image for each color. The drive voltage supply section generates and outputs a drive voltage to be supplied to the inkjet head 56 .

The drying control section 108 controls the operation of the drying section 109 according to command signals transmitted from the system control section 100 . The drying section 109 shown in FIG. 6 includes the treatment liquid drying section 16 and the ink drying section 20 shown in FIG.

The ink supply control section 110 controls the ink supply section 150 according to command signals transmitted from the system control section 100 . The ink supply control section 110 includes a valve control section 130 and a liquid transfer pump control section 132 .

The valve control section 130 controls the operation of the valve 152 provided in the ink supply section 150 . The liquid-sending pump control unit 132 controls the operation of the liquid-sending pump 154 provided in the ink supply unit 150 . That is, the ink supply control unit 110 controls ink supply from the ink tank to the inkjet head 56 and ink circulation between the ink tank and the inkjet head 56 .

The head maintenance control section 111 controls the operation of the head maintenance section 26 according to command signals transmitted from the system control section 100 . The head maintenance control unit 111 uses the head maintenance unit 26 to perform maintenance processing for the inkjet head 56 .

The memory 112 stores various data and various programs applied to the inkjet printer 10 . Memory 112 may include multiple storage elements. Examples of memory elements include ROM (Read Only Memory) and RAM (Random Access Memory).

The inkjet printing device 10 includes a temperature information acquisition section 160 . The temperature information acquisition unit 160 acquires the jetting area temperature Tj, the ink temperature T _ink and the room temperature T _e . The temperature information acquisition unit 160 can acquire temperature information from the temperature sensor 161 . The temperature sensor 161 includes a temperature sensor that detects the jetting area temperature _Tj , a temperature sensor that detects the ink temperature _Tink , and a temperature sensor that detects the room temperature _Te .

The inkjet printer 10 includes an ink temperature setting section 162 . The ink temperature setting unit 162 sets the target temperature of the ink supplied to the inkjet head 56 . The inkjet printer 10 controls the ink temperature based on the set target temperature. Note that the ink temperature setting unit 162 described in the embodiment is an example of a liquid temperature setting unit.

The inkjet printer 10 includes a threshold temperature setting section 163 . The threshold temperature setting unit 163 sets the threshold temperature _Tth according to the type of ink, printing conditions, and the like.

The threshold temperature setting unit 163 may automatically set the threshold temperature T _th according to the type of ink or the like, or may set the threshold temperature T _th based on information input using the input device 214 .

The inkjet printing apparatus 10 includes an operating state determination section 164 . The operating state determination unit 164 determines whether the inkjet printer 10 is printing or not printing. The operation state determination unit 164 can determine that the inkjet printing device 10 is printing when the print command is acquired.

[Hardware Configuration of Inkjet Printer]
FIG. 7 is a block diagram showing a hardware configuration example of the inkjet printing apparatus shown in FIG. A control device 200 provided in the inkjet printing apparatus 10 includes a processor 202 , a non-transitory tangible computer-readable medium 204 , a communication interface 206 and an input/output interface 208 .

A computer is applied to the control device 200 . The form of the computer may be a server, a personal computer, a workstation, a tablet terminal, or the like.

The processor 202 includes a CPU (Central Processing Unit), which is a general-purpose processing device. The processor 202 may include a GPU (Graphics Processing Unit), which is a processing device specialized for image processing.

Processor 202 is coupled to computer-readable media 204 , communication interface 206 , and input/output interface 208 via bus 210 . Input device 214 and display device 216 are connected to bus 210 via input/output interface 208 .

The computer-readable medium 204 includes memory, which is a main memory device, and storage, which is a secondary memory device. The computer readable medium 204 may use semiconductor memory, hard disk drives, solid state drives, and the like. Computer readable medium 204 may utilize any combination of devices.

A hard disk drive may be referred to as HDD, which is an abbreviation for Hard Disk Drive in English. A solid state drive device may be referred to as SSD, which is an abbreviation for Solid State Drive in English.

The control device 200 is connected to a network via a communication interface 206 and is communicably connected to an external device. The network can use a LAN (Local Area Network) or the like. Note that illustration of the network is omitted.

The computer-readable medium 204 stores a transport control program 220 , a treatment liquid application control program 222 , a print control program 224 , a drying control program 226 , an ink supply program 228 and a head maintenance program 229 . Computer readable medium 204 may function as memory 112 shown in FIG.

The transport control program 220 is applied to the transport control unit 102 shown in FIG. The transport control program 220 includes a drum drive control program 230 and a suction control program 232 . The drum drive control program 230 is applied to the drum drive control section 120 . The suction control program 232 is applied to the suction pump controller 122 .

The suction control program 232 is executed when the sheet S is supported by suction. The suction control program 232 acquires the jetting area temperature _Tj from the temperature sensor 161, acquires the operating state of the inkjet printing apparatus 10 from the operating state determination unit 164, and is executed during the exhaust process of the printing unit 18. be done.

The treatment liquid application control program 222 is applied to the treatment liquid application control unit 104 . A print control program 224 is applied to the print control unit 106 . The drying control program 226 corresponds to ink temperature control applied to the drying control unit 108 .

The ink supply program 228 is applied to the ink supply controller 110 . The ink supply program 228 is executed during ink supply, ink circulation and ink temperature adjustment.

Various programs stored on computer readable medium 204 include one or more instructions. The computer-readable medium 204 stores various data, various parameters, and the like.

In the inkjet printing apparatus 10, the processor 202 executes various programs stored in the computer-readable medium 204 to realize various functions in the inkjet printing apparatus 10. FIG. Note that the term program is synonymous with the term software.

Control device 200 implements data communication with external devices via communication interface 206 . The communication interface 206 can apply various standards such as USB (Universal Serial Bus). The communication form of the communication interface 206 may be either wired communication or wireless communication.

An input device 214 and a display device 216 are connected to the control device 200 via an input/output interface 208 . Input devices such as a keyboard and a mouse are applied to the input device 214 . Various information applied to the control device 200 is displayed on the display device 216 .

A liquid crystal display, an organic EL display, a projector, or the like can be applied to the display device 216 . Display device 216 may apply any combination of devices. Note that EL in the organic EL display is an abbreviation for Electro-Luminescence.

Here, examples of the hardware structure of the processor 202 include a CPU, GPU, PLD (Programmable Logic Device), and ASIC (Application Specific Integrated Circuit). A CPU is a general-purpose processor that executes programs and acts as various functional units. A GPU is a processor specialized for image processing.

A PLD is a processor whose electrical circuitry can be reconfigured after the device is manufactured. Examples of PLDs include FPGAs (Field Programmable Gate Arrays). An ASIC is a processor with dedicated electrical circuitry specifically designed to perform a particular process.

One processing unit may be composed of one of these various processors, or may be composed of two or more processors of the same type or different types. Examples of combinations of various processors include combinations of one or more FPGAs and one or more CPUs, and combinations of one or more FPGAs and one or more GPUs. Other examples of combinations of various processors include combinations of one or more CPUs and one or more GPUs.

A plurality of functional units may be configured using one processor. As an example of configuring multiple functional units using one processor, a combination of one or more CPUs and software such as SoC (System On a Chip), typified by a computer such as a client or server, is applied. There is an aspect in which one processor is configured and this processor is made to act as a plurality of functional units.

As another example of configuring a plurality of functional units using one processor, there is a mode of using a processor that implements the functions of the entire system including a plurality of functional units using a single IC chip. Note that IC is an abbreviation for Integrated Circuit.

In this way, various functional units are configured using one or more of the various processors described above as a hardware structure. Further, the hardware structure of the various processors described above is, more specifically, an electric circuit combining circuit elements such as semiconductor elements.

The computer readable medium 204 may include semiconductor devices such as read only memory (ROM) and random access memory (RAM). Computer readable media 204 may include magnetic storage media such as a hard disk. Computer readable media 204 may comprise multiple types of storage media.

[Configuration example of print drum]
FIG. 8 is a perspective view showing a configuration example of a print drum. A plurality of suction holes are formed on the outer peripheral surface 52C of the print drum 52 . In addition, in FIG. 8, individual illustration of a plurality of suction holes is omitted. A plurality of suction holes are shown in FIG. 9 with reference numeral 300 . In FIG. 7, a plurality of suction holes are arranged in the dot-hatched area. A plurality of suction holes shown in FIG. 8 are also formed on the side of the print drum 52 not shown in FIG. The print drum 52 shown in FIG. 8 has a structure in which two sheets are wound around the main body. Details of the structure of the print drum 52 will be described later.

9 is a partially enlarged view of the outer peripheral surface of the print drum shown in FIG. 8. FIG. A plurality of suction holes 300 are formed in the sheet on the outer peripheral surface 52C side of the two sheets. The suction groove 310 is formed in the sheet on the main body side of the two sheets.

A plurality of suction holes 300 communicate with one of the suction grooves 310 . A plurality of suction grooves 310 are formed on the sheet on the main body side. A plurality of suction grooves 310 extend along the longitudinal direction of the print drum 52 .

A plurality of ribs 312 are formed inside the suction groove 310 . Rib 312 has a height corresponding to the depth of suction groove 310 . One of the plurality of ribs 312 is illustrated in FIG. The ribs 312 prevent the sheet in which the suction holes 300 are formed from sinking into the suction grooves 310 .

Constricted portions 314 are formed at the ends of the plurality of suction grooves 310 . The narrowed portion 314 has a narrow structure of the plurality of suction grooves 310 , and has a function of restricting the amount of air flowing to the suction grooves 310 and restricting the release of the pressure for sucking the sheet S.

At least a portion of the diaphragm portion 314 has a closed structure that is not exposed to the outer peripheral surface 52</b>C of the print drum 52 . In other words, the narrowed portion 314 is arranged in a suction hole non-formed region where the suction holes 300 of the outer peripheral surface 52C of the print drum 52 are not formed.

At least a portion of the throttle portion 314 communicates with a body groove 320 formed in the body of the print drum 52 . The body groove 320 is connected to a suction channel formed inside the print drum 52 . A plurality of circumferentially extending body grooves 320 are formed in the body of the print drum 52 .

FIG. 10 is a sectional view showing the three-dimensional structure of the print drum shown in FIG. FIG. 10 is a cross-sectional view along the XX cross-sectional line shown in FIG. 10, illustration of the ribs 312 shown in FIG. 9 is omitted.

The printing drum 52 has the suction grooved sheet 310A wound around the main body 52E, and the suction hole sheet 300A is wound over the suction grooved sheet 310A. The suction grooves 310 are formed as recesses that do not penetrate the suction groove sheet 310A. The narrowed portion 314 is formed as a hole penetrating the suction grooved sheet 310A. The suction hole 300 is formed as a hole penetrating the suction hole sheet 300A.

The structure of the print drum 52 shown in FIGS. 8 to 10 is an example, and the print drum 52 shown in FIGS. The structure is not limited to

In the present embodiment, a drum transport method that transports the paper S using a plurality of transport drums was exemplified. You may apply the adsorption|suction belt conveyance which uses.

[Configuration example of inkjet head]
FIG. 11 is a perspective view showing a configuration example of an inkjet head. The inkjet head 56 has a structure in which a plurality of head modules 400 are connected along the longitudinal direction. A plurality of head modules 400 are integrally supported using a support frame 420 .

Two flexible substrates 422 are connected to each head module 400 . The flexible substrate 422 is formed with electrical wiring for transmitting driving voltages supplied to the ejection elements provided in the head module 400 .

The ejection element includes a nozzle opening, a flow path communicating with the nozzle opening, and an energy generating element. The energy generating element applies ejection pressure to the ink ejected from the nozzle openings. A piezoelectric element can be applied as the energy generating element. Note that illustration of nozzle openings, flow paths, and energy generating elements is omitted in FIG. 11 .

The head module 400 has a nozzle surface 402 formed with a plurality of nozzle openings. A liquid-repellent film having liquid-repellency against ink is formed on the nozzle surface. Any arrangement such as a matrix arrangement can be applied to the arrangement of the plurality of nozzle openings. Nozzle openings are shown in FIG. 13 at 480 .

FIG. 12 is a perspective view of the head module including a partial cross-sectional view. The head module 400 has an ink supply unit including an ink supply chamber 434 and an ink circulation chamber 436 on the upper surface side in FIG.

The ink supply chamber 434 is connected to the buffer tank via the individual supply channel 438 . The ink circulation chamber 436 is connected to the buffer tank through the recovery side individual channel 440 . The buffer tank is illustrated in FIG. 15 with reference numeral 612 attached.

FIG. 13 is a sectional view showing the internal structure of the head module. The head module 400 includes an ink supply path 460 , an individual supply path 462 , a pressure chamber 464 , a nozzle communication path 466 , an individual circulation path 468 , a common circulation path 470 , a piezoelectric element 472 and a vibration plate 474 .

The ink supply channels 460 , the individual supply channels 462 , the pressure chambers 464 , the nozzle communication channels 466 , the individual circulation channels 468 and the common circulation channel 470 are formed in a channel structure 476 . Nozzle portion 478 includes nozzle opening 480 and nozzle communication passage 466 . The nozzle communication path 466 is a flow path that constitutes an ejection element and corresponds to a flow path that communicates with the nozzle opening 480 .

The individual supply channel 462 is a channel that connects the pressure chamber 464 and the ink supply channel 460 . The nozzle communication path 466 is a channel that connects the pressure chamber 464 and the nozzle opening 480 . The individual circulation channel 468 is a channel that connects the nozzle communication channel 466 and the common circulation channel 470 .

A vibrating plate 474 is arranged on the channel structure 476 . A piezoelectric element 472 is arranged on the vibration plate 474 with an adhesive layer 482 interposed therebetween. The piezoelectric element 472 has a laminated structure of a lower electrode 484 , a piezoelectric layer 486 and an upper electrode 488 . Note that the lower electrode 484 is sometimes called a common electrode, and the upper electrode 488 is sometimes called an individual electrode.

The upper electrode 488 is an individual electrode patterned in accordance with the shape of each pressure chamber 464 , and each pressure chamber 464 is provided with a piezoelectric element 472 . The piezoelectric element 472 corresponds to an energy generating element that constitutes an ejection element.

The ink supply path 460 communicates with the ink supply chamber 434 shown in FIG. Ink is supplied from the ink supply path 460 to the pressure chamber 464 via the individual supply path 462 . A driving voltage is applied to the upper electrode 488 of the piezoelectric element 472 to be operated according to the image data, and the piezoelectric element 472 and the vibration plate 474 are deformed to change the volume of the pressure chamber 464 . The head module 400 ejects ink droplets from the nozzle openings 480 via the nozzle communication passages 466 in accordance with pressure changes accompanying changes in the volume of the pressure chambers 464 .

The pressure chamber 464 corresponding to each of the nozzle openings 480 has a substantially square planar shape, and has an outflow port for the nozzle opening 480 at one of both corners on the diagonal line, and an ink inflow port at the other. A supply channel 462 is arranged. The shape of the pressure chamber is not limited to a square. The planar shape of the pressure chamber can be a rhombus, a quadrangle such as a rectangle, a pentagon, a hexagon, other polygons, a circle, and an ellipse.

A circulation outlet 490 is formed in the nozzle communication path 466 . The nozzle communication path 466 communicates with the circulation individual flow path 468 via the circulation outlet 490 . Of the ink held in the nozzle portion 478 , the ink that is not used for ejection is recovered to the common circulation channel 470 via the individual circulation channel 468 .

The circulation common channel 470 communicates with the ink circulation chamber 436 shown in FIG. Ink is recovered to the common circulation channel 470 via the individual circulation channel 468 . This prevents thickening of the ink held in the nozzle portion 478 during the non-ejection period.

FIG. 13 exemplifies piezoelectric elements 472 having separate structures corresponding to each of the plurality of nozzle portions 478 . Of course, there is a structure in which the piezoelectric layer 486 is integrally formed with respect to the plurality of nozzle portions 478, individual electrodes are formed corresponding to each of the plurality of nozzle portions 478, and an active region is formed for each nozzle portion 478. may be applied.

A two-dimensional arrangement is applied to the arrangement of the nozzle openings 480 on the nozzle surface 402 . An example of a two-dimensional arrangement is a matrix arrangement. The arrangement of the nozzle openings 480 is not limited to a matrix, and may be a one-row arrangement, a two-row zigzag arrangement, or the like. Illustration of the arrangement of the nozzle openings 480 shown in the plan view of the nozzle surface 402 is omitted.

[Configuration example of head maintenance unit]
FIG. 14 is a perspective view showing a schematic configuration of the head maintenance section. The head maintenance section 26 is adjacent to the print drum 52 in the axial direction and arranged outside the print section 18 . The head maintenance section 26 performs maintenance processing for the inkjet head 56C, the inkjet head 56M, the inkjet head 56Y, and the inkjet head 56K.

In the head maintenance section 26 , the cleaning section 500 , the wiping section 502 and the cap 504 are arranged in the order described above from the side closer to the print drum 52 .

A head unit 510 that integrally supports the inkjet head 56C, the inkjet head 56M, the inkjet head 56Y, and the inkjet head 56K is attached to a ball screw 520 that is arranged parallel to the rotating shaft 52B of the print drum 52 . A guide shaft 522 is arranged parallel to the ball screw 520 below the ball screw 520 . The head unit 510 is slidably engaged with the guide shaft 522 .

A guide rail member 526 having a guide groove 524 for guiding movement of the head unit 510 is arranged below the head unit 510 . A guide rail member 526 is arranged parallel to the ball screw 520 .

An engaging portion that engages with the guide groove 524 is protruded from the lower surface of the housing 512 of the head unit 510 . The engaging portion is slidably engaged with the guide groove 524, and the head unit 510 is guided by the guide groove 524 and is movable. Illustration of the engaging portion is omitted.

The ball screw 520 , the guide shaft 522 and the guide rail member 526 move the head unit 510 from the printing position P ₁ above the print drum 52 to the maintenance position P ₂ facing the cap 504 .

The ball screw 520 is connected to the rotating shaft of the motor, rotates according to the rotation of the motor, and moves the head unit 510 between the printing position _P1 and the maintenance position _P2 . The head unit 510 is supported so as to be vertically movable with respect to the print drum 52 using a lifting mechanism.

A connecting portion 514 between the housing 512 of the head unit 510 and the ball screw 520 and the guide shaft 522 employs an engagement structure 516 capable of direct movement that guides the elevation of the head unit 510 .

A temperature sensor 530 is arranged in the housing 512 of the head unit 510 . Temperature sensor 530 is included in temperature sensor 161 shown in FIG. A temperature sensor detects the jetting area temperature _Tj . The temperature sensor 530 can be placed at any position where the jetting area temperature _Tj can be detected. Temperature sensor 530 is included in temperature sensor 161 shown in FIG.

Note that the temperature sensor 530 described in the embodiment is an example of a head temperature sensor. The housing 512 of the head unit 510 described in the embodiment is an example of a head supporting member.

The cleaning unit 500 applies cleaning liquid to the nozzle surface 402 of the inkjet head 56 to clean the nozzle surface 402 . The wiping part 502 wipes the nozzle surface 402 . The cleaning section 500 and the wiping section 502 may be integrated. For example, a wiping sheet impregnated with a cleaning liquid may be used to clean and wipe the nozzle surface 402 .

The cap 504 functions as an ink receiver when the inkjet head 56 is purged. The cap 504 functions as a negative pressure generating chamber during suction. The cap 504 functions as a moisturizing cap for the inkjet head 56 .

[Configuration example of ink supply unit]
FIG. 15 is a block diagram showing a configuration example of an ink supply unit. The ink supply unit 150 shown in FIG.

The degassing device 622 degasses the ink flowing through the supply channel 616 . A supply pump 624 applies pressure to the ink flowing through the supply channel 616 . Supply pump 624 is included in liquid transfer pump 154 shown in FIG. A heat exchanger 626 performs temperature adjustment of the ink flowing through the supply channel 616 . The supply-side filter 628 removes foreign substances and the like from the ink supplied to the inkjet head 56 .

The ink supply section 150 also includes a circulation channel 618 , a circulation pump 650 , a valve 652 , a bypass channel 654 , a circulation side filter 690 and a valve 692 . Further, the ink supply section 150 includes a main tank 676 , a replenishment channel 678 , an overdrain channel 680 , a replenishment pump 682 and a plurality of safety valves 684 . Channels such as the supply channel 616 and channel members such as the supply pump 624 are connected via a joint F.

A circulation pump 650 applies pressure to the ink flowing through the circulation channel 618 . Circulation pump 650 is included in liquid transfer pump 154 shown in FIG. The circulation-side filter 690 removes foreign substances and the like from the ink flowing through the circulation flow path 618 . A valve 652 and a valve 692 switch the ink flow path. The valves 652 and 692 are control valves whose opening and closing are controlled according to command signals.

The replenishment pump 682 applies pressure to the ink flowing through the replenishment channel 678 to replenish the buffer tank 612 with ink from the main tank 676 . The replenishment pump 682 is included in the liquid transfer pump 154 shown in FIG. The filter 676A removes foreign substances and the like from the ink discharged from the main tank 676. FIG.

The safety valve 684 operates when the pressure in the supply channel 616 and the circulation channel 618 exceeds a specified value, and reduces the pressure in the supply channel 616 and the circulation channel 618 .

The ink supply unit 150 supplies ink from the buffer tank 612 to the inkjet head 56 through the supply channel 616 .

The ink supplied to the inkjet head 56 passes through the supply-side back pressure tank 630, the supply-side head manifold 632, the first bypass channel 664, the recovery-side head manifold 644, and the recovery-side back pressure tank 648, and is discharged from the inkjet head 56. Ejected. Ink collected from the head module 400 is discharged from the inkjet head 56 via the collection side head manifold 644 and the collection side back pressure tank 648 .

Ink is recovered from the inkjet head 56 to the buffer tank 612 via the circulation channel 618 or the bypass channel 654 .

That is, the ink supply unit 150 employs an ink circulation system that is effective for stable printing in the inkjet head 56 . For example, the ink supply unit 150 circulates the ink between the buffer tank 612 and the inkjet head 56 to maintain the temperature of the ink supplied to the inkjet head 56 within a certain range. Arrow lines shown in FIG. 15 indicate the flow of ink.

The supply head manifold 632 includes a temperature sensor 634 . A temperature sensor 634 detects the temperature of ink stored in the supply-side head manifold 632 . The collection side head manifold 644 has a temperature sensor 646 . A temperature sensor 646 detects the temperature of the ink stored in the recovery side head manifold 644 .

For the ink temperature _Tink of the inkjet head 56, the detected value of the temperature sensor 634 may be applied, or the detected value of the temperature sensor 646 may be applied. For the ink temperature T _ink , the average value, the maximum value, and the minimum value of the detected values of the temperature sensor 634 and the detected value of the temperature sensor 646 may be applied. Temperature sensor 530 and temperature sensor 646 are included in temperature sensor 161 shown in FIG.

Note that the temperature sensor 646 described in the embodiment is an example of a liquid temperature sensor. The supply-side head manifold 632 and the recovery-side head manifold 644 described in the embodiment are examples of the liquid reservoir.

The inkjet printer 10 is provided with an ink supply unit 150 for each ink color. When one inkjet head 56 is provided for one color, each color is synonymous with each inkjet head 56 . A separate ink supply 150 is provided for each ink jet head 56 for each color.

The configuration of the ink supply unit 150 shown in FIG. 15 is an example, and for example, a configuration that does not circulate ink without including the circulation flow path 618 or the like may be adopted.

[Action and effect of the embodiment]
The inkjet printing apparatus and the exhaust method according to the embodiment can obtain the following effects.

[1]
If the relationship between the jetting area temperature T _j and the threshold temperature T _th satisfies T _th ≤ T _j and the relationship between the jetting area temperature T _j and the room temperature T _e satisfies T _j >T _e , printing The suction support mechanism of the print drum 52 is operated to exhaust the air of the printing section 18 to the outside of the device placement chamber 80 through the suction flow path of the print drum 52 or the like regardless of whether it is medium or cycle-up. be done. As a result, a constant heat exhaust efficiency around the inkjet head 56 can be achieved in a non-printing state in which printing is being performed or cycle-up is not being performed. In addition, the air in the device arrangement chamber 80 having a temperature lower than the jetting area temperature _Tj is introduced to the periphery of the inkjet head 56, so that the temperature increase in the periphery of the inkjet head 56 is suppressed.

[2]
If the relationship between the ink temperature T _ink and the threshold temperature T _th satisfies T _ink <T _th or if the relationship between the jetting area temperature T _j and the ink temperature T _ink satisfies T _ink < T _j , the air in the printing section 18 is exhausted to the outside of the device placement chamber 80 through the suction flow path of the printing drum 52 or the like. As a result, the printing unit 18 is evacuated according to the ink temperature _Tink , and dew condensation on the inkjet head 56 can be suppressed.

[3]
The ink temperature T _ink is detected using temperature sensor 634 and/or temperature sensor 646 . Thereby, the temperature of the ink supplied to the inkjet head 56 and the temperature of the ink discharged from the inkjet head 56 can be grasped.

[4]
The set value of the ink temperature setting unit 162 is applied to the ink temperature T _ink . Thus, even if the temperature sensor 634 and the temperature sensor 646 are not provided, the printing section 18 can be exhausted according to the ink temperature _Tink .

[5]
If the relationship between the jetting area temperature _Tj and the room temperature _Te satisfies _Tj ≦ _Te , the suction support mechanism of the print drum 52 is not operated. As a result, it is possible to suppress the inflow of relatively high-temperature air in the device placement chamber 80 into the printing section 18 .

[6]
The adsorption support mechanism of the print drum 52 is operated, and the printing section 18 is evacuated. As a result, the printing unit 18 can be evacuated at a position far from the cap 504 that keeps the ink jet head 56 moist, and the increase in the air volume in the vicinity of the cap 504 due to the exhaust can be suppressed, and the inkjet head 56 can be maintained in good condition. obtain.

Although there is a concern that the life of the suction pump 83 shown in FIG. 3 may be shortened, failure of the inkjet head 56, which is more expensive than the suction pump 83, is suppressed, so that the cost of the apparatus can be suppressed.

In the embodiments of the present invention described above, constituent elements can be changed, added, or deleted as appropriate without departing from the gist of the present invention. The present invention is not limited to the embodiments described above, and many modifications are possible within the technical concept of the present invention by those skilled in the art. Further, the embodiments, modified examples, and application examples may be combined as appropriate.

10 Inkjet printing device 12 Paper supply unit 14 Treatment liquid application unit 16 Treatment liquid drying unit 18 Printing unit 20 Ink drying unit 24 Paper discharge unit 26 Head maintenance unit 28 Cover 28A Cover 28B Ceiling surface 28C Intake port 30 Paper supply table 32 Sucker device 34 feed roller pair 36 feeder board 38 front pad 40 feed drum 40A gripper 40B rotary shaft 42 treatment liquid drum 42A gripper 42B rotary shaft 42C outer peripheral surface 44 treatment liquid application device 46 treatment liquid drying drum 46A gripper 46B rotary shaft 46C outer peripheral surface 48 Paper transport guide 50 Treatment liquid drying unit 52 Printing drum 52A Gripper 52B Rotary shaft 52C Outer peripheral surface 52D Pump connection port 52E Main body 54 Paper pressing roller 56 Inkjet head 56C Inkjet head 56K Inkjet head 56M Inkjet head 56Y Inkjet head 58 Inline sensor 64 Chain Gripper 64A First sprocket 64B Second sprocket 64C Chain 64D Gripper 68 Ink drying unit 72 Guide plate 73 Guide plate 76 Sheet discharge table 80 Device placement chamber 82 Pump channel 84 Device exhaust port 86 Duct 88 Exhaust port 90 Temperature sensor 100 System control Section 102 Transport Control Section 104 Treatment Liquid Application Control Section 106 Print Control Section 108 Drying Control Section 109 Drying Section 110 Ink Supply Control Section 111 Head Maintenance Control Section 112 Memory 120 Drum Drive Control Section 122 Suction Pump Control Section 130 Valve Control Section 132 Liquid pump control unit 140 Drum drive device 150 Ink supply unit 152 Valve 154 Liquid feed pump 160 Temperature information acquisition unit 161 Temperature sensor 162 Ink temperature setting unit 163 Threshold temperature setting unit 164 Operating state determination unit 200 Control device 202 Processor 204 Computer readable medium 206 communication interface 208 input/output interface 210 bus 214 input device 216 display device 220 transport control program 222 treatment liquid application control program 224 print control program 226 drying control program 228 ink supply program 230 drum drive control program 232 suction control program 300 suction hole 300A Suction hole sheet 310 Suction groove 310A Suction groove sheet 312 Rib 314 Constricted portion 320 Body groove 400 Head module 402 Nozzle surface 420 Support frame 422 Flexible substrate 430 Nozzle plate 434 Ink supply chamber 436 Ink circulation chamber 438 Supply side individual channel 440 Recovery side Individual channel 460 Ink supply channel 462 Individual supply channel 464 Pressure chamber 466 Nozzle communication channel 468 Individual circulation channel 470 Common circulation channel 472 Piezoelectric element 474 Diaphragm 476 Channel structure 478 Nozzle part 480 Nozzle opening 482 Adhesive layer 484 Lower part Electrode 486 Piezoelectric layer 488 Upper electrode 490 Circulation outlet 500 Cleaning part 502 Wiping part 504 Cap 510 Head unit 512 Housing 514 Connecting part 516 Engagement structure 520 Ball screw 522 Guide shaft 524 Guide groove 526 Guide rail member 612 Buffer tank 616 Supply flow Path 618 Circulation flow path 622 Deaerator 624 Supply pump 626 Heat exchanger 628 Supply side filter 630 Supply side back pressure tank 632 Supply side head manifold 634 Temperature sensor 644 Recovery side head manifold 646 Temperature sensor 648 Recovery side back pressure tank 650 Circulation pump 652 valve 654 bypass channel 664 first bypass channel 676 main tank 676A filter 678 replenishment channel 680 overdrain channel 682 replenishment pump 684 safety valve 690 circulation side filter F joint P ₁ printing position P ₂ maintenance position S paper S10 to S24 Each step of the exhaust method

Claims (13)

A liquid ejection device for ejecting liquid,
a liquid ejection head for ejecting liquid onto a substrate;
an adsorption support device that applies a negative pressure to the substrate to adsorb and support the substrate;
a relative movement device for relatively moving the substrate and the liquid ejection head, which are supported by suction using the suction support device;
a gas flow path for discharging gas discharged from the adsorption support device to the outside of a device placement chamber in which the liquid ejection device is placed;
a head temperature sensor that detects the ambient temperature of the liquid ejection head;
at least one processor;
at least one memory storing a program to be executed by the at least one processor;
with
The at least one processor executes the program,
acquiring the ambient temperature of the liquid ejection head from the head temperature sensor;
obtaining the room temperature from a room temperature sensor that detects the room temperature, which is the internal temperature of the device installation room;
In a non-printing state, when the ambient temperature of the liquid ejection head is equal to or higher than a specified ambient threshold temperature and the ambient temperature of the liquid ejection head exceeds the room temperature, the suction support device is operated to A liquid ejecting apparatus for discharging gas around the liquid ejecting head to the outside of the device placement chamber and introducing gas inside the device placement chamber to the periphery of the liquid ejecting head. 2. The liquid ejecting apparatus according to claim 1, further comprising a gas intake port for introducing gas inside said apparatus placement chamber into said liquid ejecting apparatus. A room temperature sensor that detects the temperature of the device placement room,
3. The liquid ejecting apparatus according to claim 2, wherein the room temperature sensor detects the temperature of the gas introduced into the liquid ejecting apparatus through the gas inlet. The at least one processor
acquiring the temperature of the liquid to be ejected from the liquid ejection head;
When the temperature of the liquid satisfies a specified condition, the suction support device is operated to discharge the gas around the liquid ejection head to the outside of the device placement chamber, thereby removing the gas inside the device placement chamber. 4. The liquid ejection apparatus according to any one of claims 1 to 3, wherein the liquid ejection head is introduced around the liquid ejection head. A liquid temperature sensor that detects the temperature of the liquid,
The at least one processor
obtaining the temperature of the liquid from the liquid temperature sensor;
When the temperature of the liquid satisfies a specified condition, the temperature of the liquid exceeds a specified liquid threshold temperature, or the temperature of the liquid is lower than the ambient temperature of the liquid ejection head, the suction support device is operated. 5 . 6. The liquid ejection apparatus according to claim 5, wherein the liquid temperature sensor is arranged in a liquid storage section in which liquid to be supplied to the liquid ejection head is stored. a liquid temperature setting unit for setting a target temperature of the liquid to be ejected from the liquid ejection head;
The at least one processor
obtaining the target temperature set using the liquid temperature setting unit as the temperature of the liquid;
When the temperature of the liquid satisfies a specified condition, and the temperature of the liquid is lower than the ambient temperature of the liquid ejection head, the suction support device is operated to remove the gas inside the liquid ejection device from the liquid ejection head. 5. The liquid ejection device according to claim 4, wherein the liquid is discharged to the outside of the placement chamber. 5. The liquid ejecting apparatus according to claim 4, wherein the at least one processor does not perform the determination based on the temperature of the liquid when the temperature of the liquid ejected from the liquid ejecting head is maintained within a specified range. The liquid ejection apparatus according to any one of claims 1 to 8, wherein the head temperature sensor is arranged on a head support member that supports the liquid ejection head. 10. The liquid ejector of any one of claims 1-9, wherein the at least one processor obtains the ambient threshold temperature. 11. The at least one processor according to any one of claims 1 to 10, wherein, when the ambient temperature of the liquid ejection head is equal to or lower than the room temperature, the suction support device is inoperative or stops the operation of the suction support device. 1. The liquid ejection device according to claim 1. An exhaust method applied to a liquid ejection device that ejects liquid,
the computer
acquiring the ambient temperature of the liquid ejection head that ejects the liquid onto the substrate from a head temperature sensor that detects the ambient temperature of the liquid ejection head;
acquiring the room temperature from a room temperature sensor that detects the room temperature, which is the internal temperature of the device placement room in which the liquid ejecting device is placed;
In a non-printing state, when the ambient temperature of the liquid ejection head is equal to or higher than the specified ambient threshold temperature and the ambient temperature of the liquid ejection head exceeds the room temperature, the substrate is transported. By applying a negative pressure to the material to operate an adsorption support device that adsorbs and supports the substrate, the gas around the liquid ejection head is discharged to the outside of the device placement chamber, and the gas inside the device placement chamber is discharged. to the periphery of the liquid ejection head. A program applied to a liquid ejecting apparatus that ejects liquid,
to the computer,
A function of obtaining the ambient temperature of the liquid ejection head that ejects the liquid onto the substrate from the head temperature sensor that detects the ambient temperature of the liquid ejection head;
A function of acquiring the room temperature from a room temperature sensor that detects the room temperature, which is the internal temperature of the device installation room in which the liquid ejection device is arranged, and a function of obtaining the room temperature, and a function of obtaining the room temperature, which is the internal temperature of the device installation room in which the liquid ejection device is arranged, and a function of obtaining the room temperature in a non-printing state. When the ambient temperature of the liquid ejection head is equal to or higher than the threshold temperature and the ambient temperature of the liquid ejection head exceeds the room temperature, a negative pressure is applied to the substrate to adsorb and support the substrate when the substrate is conveyed. A program for realizing a function of operating a support device to discharge gas around the liquid ejection head to the outside of the device placement chamber and introducing gas inside the device placement chamber to the periphery of the liquid ejection head.

Images