JP7428088B2 - inkjet recording device - Google Patents

Description

The present invention relates to an inkjet recording device.

2. Description of the Related Art In recent years, inkjet recording devices that eject ink from an inkjet head (hereinafter simply referred to as a head) have become widely used as devices for recording high-definition images on various recording media such as paper and fabric.

An inkjet recording device has a plurality of inkjet heads, and records an image on a recording medium by ejecting ink from the nozzles of the plurality of inkjet heads. Specifically, as disclosed in Patent Documents 1 and 2, an inkjet recording apparatus includes a plurality of heads, a support plate that supports the plurality of heads, and a channel section that supplies ink to the plurality of heads. and has.

Patent Document 1 discloses that a heater is provided on the support plate, and by heating the support plate with the heater, the inkjet head and the support plate are thermally expanded to the same extent, maintaining the positional accuracy of the inkjet head and the support member, and achieving high A technique that enables accurate image formation is described.

Patent Document 2 describes a technique for suppressing the occurrence of warpage of a support plate due to a temperature difference between the support plate and the reinforcement plate by providing a heater on a reinforcing plate that reinforces the support plate.

JP2010-269450A Japanese Patent Application Publication No. 2016-132226

By the way, the technique described in Patent Document 1 suppresses the decrease in printing accuracy due to the temperature difference between the head and the support plate, and the technique described in Patent Document 2 suppresses the decrease in printing accuracy due to the temperature difference between the support plate and the reinforcing plate. This suppresses a decrease in printing accuracy.

However, even if these techniques are used, it may not be possible to sufficiently suppress a decrease in printing accuracy due to temperature differences between members.

SUMMARY OF THE INVENTION An object of the present invention is to provide an inkjet recording apparatus that can suppress a decrease in printing accuracy caused by temperature differences between members.

One embodiment of the inkjet recording device of the present invention is
multiple heads,
a support plate that supports the plurality of heads;
a channel section that supplies ink to the plurality of heads;
a flow path section heater that raises the temperature of the flow path section;
a temperature sensor that detects the temperature of the flow path section and the support plate;
a control unit that controls the difference between the temperature of the flow path portion and the temperature of the support plate to be equal to or less than a predetermined value based on a detection result of the temperature sensor;
Equipped with.

According to the present invention, by controlling the difference between the temperature of the flow path section and the temperature of the support plate to be equal to or lower than a predetermined value, the temperature difference between the flow path section and the support plate is reduced due to the difference in thermal expansion between the flow path section and the support plate. Misalignment of the head between the head and the support plate can be suppressed, and as a result, a decrease in printing accuracy can be suppressed.

FIG. 1 is a side view showing the overall configuration of an inkjet recording apparatus according to an embodiment, focusing on the mechanism. FIG. 1 is a block diagram showing the overall configuration of an inkjet recording apparatus with a focus on signal processing. FIG. 3 is an enlarged side view showing the vicinity of the head portion. FIG. 3 is a diagram showing the inside of the head unit viewed from above. FIG. 3 is a schematic side view showing the internal configuration of the head unit. FIG. 3 is a perspective view showing the overall shape of the support plate. FIG. 7A is a schematic side view showing the state of the head unit when a difference in thermal expansion occurs, and FIG. 7A is a diagram showing when a difference in thermal expansion does not occur, and FIG. 7B is a diagram showing a state when a difference in thermal expansion occurs. FIG. It is a graph showing the difference in temperature rise (which may also be called the difference in thermal expansion) between the flow path portion and the support plate. FIG. 3 is a cross-sectional view showing a buffer structure of a connecting channel.

Hereinafter, embodiments of the present invention will be described in detail using the drawings.

<1> Overall configuration of inkjet recording apparatus FIG. 1 is a side view showing the overall configuration of an inkjet recording apparatus according to an embodiment, focusing on the mechanism. The inkjet recording device 10 includes a paper feed section 20, a recording device main body 30, and a paper discharge section 40.

The paper feed section 20 includes a paper feed tray 21 that accommodates the recording medium P, and a conveyor belt 22 that transports the recording medium P from the paper feed tray 21 to the image recording section 30.

The recording apparatus main body 30 roughly includes a head section 100 and a transport mechanism section 200.

The transport mechanism section 200 includes a transport drum 31, a delivery roller 32, a head section 100 in which a plurality of head units 101 to 104 are arranged, an energy ray irradiation section 33, and a plurality of rollers 34a, 34b, and 34c. and a paper reversing roller 35.

The conveyance drum 31 conveys the recording medium P in the direction of the arrow A by rotating in the direction shown by the arrow A in the figure while holding the recording medium P on the outer peripheral curved surface (conveyance surface). The conveyance drum 31 has claw portions 31a, 31b, 31c and a suction portion (not shown) in order to hold the recording medium P on its conveyance surface. The recording medium P is conveyed while being held on the conveyance surface by having its end pressed by one of the claws 31a to 31c of the conveyance drum 31 and being drawn toward the conveyance surface by the suction section.

The claws 31a to 31c of the transport drum 31 introduce the recording medium P into the transport drum 31 by interlocking with the claws 32a of the transfer roller 32 and the swing arms 36a and 36b. Furthermore, the claws 31a to 31c of the transport drum 31 eject the recording medium P from the transport drum 31 by interlocking with the claw 34a1 of the roller 34a. Further, the front and back sides of the recording medium P are reversed by interlocking the claws 34a1, 34b1, 34c1 of the conveyance switching unit composed of a plurality of rollers 34a, 34b, 34c and the claw 35a of the paper reversing roller 35. .

In this manner, the recording apparatus main body 30 performs recording using the inkjet method using the head section 100 while the conveyance mechanism section 200 conveys the recording medium P.

The inkjet recording apparatus 10 sends the recorded recording medium P to the paper discharge section 40 via the roller 34c and the conveyor belt 41. Recorded recording media P are stacked on the paper discharge tray 42 of the paper discharge section 40 .

FIG. 2 is a block diagram showing the overall configuration of the inkjet recording apparatus 10, focusing on signal processing. The overall processing of the inkjet recording apparatus 10 is controlled by the control section 300.

The data input unit 12 has an input interface, a memory, etc., and inputs and receives data related to print jobs (job commands, image data of images to be printed, various setting data, etc.) from an external device under the control of the control unit 300. The image data is stored and output to the head drive unit 110 of the head unit 100 when a print job is executed.

The head section 100 includes a head drive section 110 and a plurality of head units 101 to 104. The plurality of head units 101 to 104 each eject ink of a different color. Specifically, as can be seen from FIG. 1, a head unit 101 that ejects yellow (Y) ink, a head unit 102 that ejects magenta (M) ink, and a cyan (C) ink are arranged along the conveyance direction. A head unit 103 that ejects black (K) ink, and a head unit 104 that ejects black (K) ink are sequentially arranged. The head units 101 to 104 are each arranged to extend along a direction perpendicular to the conveyance direction of the recording medium P (the direction of arrow A in FIG. 1) (that is, a direction parallel to the rotation axis of the conveyance drum 31). ing.

Although not shown in FIG. 1, in one specific example, each of the head units 101 to 104 includes a pressure chamber that stores ink, a piezo element provided on the wall of the pressure chamber, and a nozzle. As a result, in each of the head units 101 to 104, when a drive signal for deforming the piezo element is input from the head driving section 110, the pressure chamber is deformed by the deformation of the piezo element, and the pressure inside the pressure chamber changes. Ink is ejected from a nozzle communicating with the pressure chamber. That is, based on the control of the control unit 11, the head drive unit 110 sends a drive signal to each of the head units 101 to 104 at appropriate timing to cause the piezo element to perform a deforming operation in accordance with the pixel value of the image data. By supplying ink, an amount of ink corresponding to the pixel value is ejected from the nozzles of the corresponding head units 101 to 104.

<2> Configuration of head section in embodiment Next, the configuration of the head section, which is a feature of the present invention, will be described.

FIG. 3 is an enlarged side view showing the vicinity of the head section 100 in FIG. 1. A plurality of head modules a1 are provided within each head unit 101-104.

FIG. 4 is a diagram showing the interior of any one of the head units 101 to 104 (102 to 104) as viewed from above. As can be seen from the figure, in this example, two rows of head modules a1 are provided extending in the head unit 101 (102 to 104) in a direction parallel to the rotation axis of the transport drum 31. There is.

FIG. 5 is a schematic side view of the interior of any one of the head units 101 to 104 (102 to 104), viewed from the same direction as FIG. Since the configurations of each of the head units 101 to 104 are similar, the configuration of the head unit 101 will be described below as a representative.

Inside the head unit 101, a plurality of head modules a1 are provided as described above. Further, each head module a1 is provided with a plurality of heads h1, h2, h3, and h4 each having an ink ejection port formed therein. The heads h1 to h4 are supported by a support plate 120. Note that the gap between the heads h1 to h4 and the transport drum 31 is about 1 mm.

Each head h1, h2, h3, h4 is provided with nozzles h1a, h1b, h2a, h2b, h3a, h3b, h4a, h4b that eject ink. Note that the number of nozzles provided may be changed depending on the printing resolution, which is the specification of the inkjet printing apparatus 10. For example, in this embodiment, nozzles h1a, h1b, h2a, h2b, h3a, h3b, h4a, and h4b are provided so that each head h1, h2, h3, and h4 can form an image at 600 dpi.

Ink is supplied to each of the heads h1, h2, h3, and h4 from a flow path section 130. Ink is supplied to the flow path section 130 from a tank (not shown) storing yellow (Y) ink. An ink flow path is formed in the flow path section 130, and this flow path communicates with nozzles h1a, h1b, h2a, h2b, h3a, h3b, h4a, and h4b. As a result, yellow (Y) ink is supplied to the nozzles h1a, h1b, h2a, h2b, h3a, h3b, h4a, and h4b.

FIG. 4 is a perspective view showing the overall shape of the support plate 120. As can be seen, the support plate 120 extends in the direction of the axis of the transport drum 31. In reality, the length of the support plate 120 in the axial direction of the transport drum 31 (that is, the length in the longitudinal direction) is about 1 to 2 [m], which is very long. The support plate 120 is made of a material with good thermal conductivity, such as aluminum, and also has the function of radiating heat from the head module a1.

The support plate 120 includes a bottom plate 121 that supports the heads h1, h2, h3, and h4, and a reinforcing plate 122 that stands up from the bottom plate 121. By providing the reinforcing plate 122, warping of the support plate 120 in the longitudinal direction is suppressed.

Both the support plate 120 and the channel section 130 are metal members that extend long in a direction parallel to the axial direction of the conveyance drum 31.

Although not shown, the flow path section 130 and the support plate 120 are connected and fixed at a substantially central position in the longitudinal direction of the support plate 120. As a result, the flow path portion 130 and the support plate 120 thermally expand with the longitudinal center of the support plate 120 as a reference. In other words, the difference in thermal expansion increases as the distance from the longitudinal center of the support plate 120 increases.

FIG. 7 is a schematic side view showing the state of the head unit 101 when a difference in thermal expansion occurs. FIG. 7A is a diagram showing a case where no difference in thermal expansion occurs, and FIG. 7B is a diagram showing a case when a difference in thermal expansion occurs. From the figure, the difference in thermal expansion between the flow path section 130 and the support plate 120 causes a large stress to be applied to the connection flow paths such as the nozzle h1a (h1b, h2a, h2b, h3a, h3b, h4a, h4b). It can be seen that the positions of the connecting channels such as the nozzles h1a (h1b, h2a, h2b, h3a, h3b, h4a, h4b) shift due to stress. As a result, the position of the tip of the head h1 (h2, h3, h4), that is, the ejection port, fluctuates, resulting in a decrease in printing accuracy.

The configurations described above are known configurations that have been proposed or realized in the past.

In addition to this configuration, the head section 100 of the present embodiment includes flow path section heaters 141a and 141b that raise the temperature of the flow path section 130, a temperature sensor 151 that detects the temperature of the flow path section 130 and the support plate 120, 152. Further, the head section 100 includes a support plate heater 142 that raises the temperature of the support plate 120.

The channel heaters 141a, 141b and the support plate heater 142 are, for example, rubber heaters. In the example shown in FIG. 5, two flow path heaters 141a and 141b are provided, but the number and position of the flow path heaters are not limited to the example shown in FIG. It is sufficient if it is provided. Similarly, the position of the support plate heater 142 is not limited to the position shown in FIG. 5, as long as it is provided at a position where the support plate 120 can be heated.

The temperature sensor 151 is attached to the side surface of the flow path section 130. The temperature sensor 152 is attached to the reinforcing plate 122 of the support plate 120. However, the positions of the temperature sensors 151 and 152 are not limited to this, and it is sufficient that they are provided at positions where the temperatures of the flow path section 130 and the support plate 120 can be detected.

As shown in FIG. 2, the detection results of the temperature sensors 151 and 152 are sent to the control unit 300. Further, the control unit 300 controls the channel heater 141 and the support plate heater 142 based on the detection results of the temperature sensors 151 and 152.

Specifically, the control unit 300 controls the flow path heater 141 and the support plate heater 142 so that the difference between the temperature of the flow path portion 130 and the temperature of the support plate 120 is equal to or less than a predetermined value. As a result, the temperature difference between the flow path section 130 and the support plate 120 is suppressed to a predetermined value or less, so that the expansion difference between the flow path section 130 and the support plate 120 due to the temperature difference between the flow path section 130 and the support plate 120 is reduced. suppressed. As a result, the stress applied to the nozzles h1a, h1b, h2a, h2b, h3a, h3b, h4a, h4b existing between the flow path section 130 and the support plate 120 is reduced, and the stress applied to the nozzles h1a, h1b, h2a, h2b, h3a, It is possible to suppress the position of the head module a1 from shifting due to h3b, h4a, and h4b. In this way, it becomes possible to suppress a decrease in printing accuracy due to temperature differences between members.

FIG. 8 is a graph showing the difference in temperature rise (also referred to as the difference in thermal expansion) between the flow path section 130 and the support plate 120.

In the inkjet recording apparatus 10, the temperature of the ink is raised to about 80±3 [° C.] during printing. Then, the heated ink is cooled and solidified by the transport drum 31 at about 50[° C.], thereby realizing printing without liquid drift.

Before starting printing, the inkjet recording apparatus 10 first raises the temperature of the flow path section 130 to a target temperature using the flow path section heaters 141a and 141b. As a result, as can be seen from FIG. 8, the temperature of the flow path section 130 rises rapidly. On the other hand, the temperature of the support plate 120 gradually rises due to heat conduction from the head units 101 to 104. As a result, the temperature difference between the flow path section 130 and the support plate 120 increases.

In the inkjet recording apparatus 10 of the present embodiment, even if the temperature of the flow path section 130 rises rapidly, the control section 300 ensures that the difference between the temperature of the flow path section 130 and the temperature of the support plate 120 is equal to or less than a predetermined value. Since the temperature of the support plate 120 is controlled to increase, the temperature difference between the flow path portion 130 and the support plate 120 is suppressed to a predetermined value or less.

Incidentally, it is ideal that the temperature of the support plate 120 is maintained at about 60 to 70 [°C] after the temperature is raised. This is because the head module a1 is provided with a piezo element, and when the temperature becomes high, the movement of the piezo element becomes slow. In addition, heat is generated due to the movement of the piezo element itself, leading to an increase in the temperature of the head module a1. In reality, during printing, the temperature of the support plate 120 rises to about 80[° C.] due to the heat generated by the head module a1.

Note that, unlike this embodiment, when the temperature of the support plate 120 is not raised by the heater 142, the temperature difference between the flow path portion 130 and the support plate 120 is particularly becomes larger than a predetermined value, and as a result, the difference in thermal expansion between the flow path section 130 and the support plate 120 increases, so that the nozzles h1a, h1b, h2a existing between the flow path section 130 and the support plate 120 , h2b, h3a, h3b, h4a, h4b, etc., are subjected to a large stress. This stress also applies stress to the head module a1, and as a result, the position of the head module a1 shifts (specifically, as shown in FIG. 7B, the positions of the nozzle mounting portion 160 and the nozzle h1a shift), and As a result, the printing position shifts, resulting in a decrease in printing quality.

Note that in this specification, the flow path formed in the flow path portion 130 is referred to as the main flow path, and the flow paths from exiting the main flow path to the discharge ports of the heads h1, h2, h3, and h4 are referred to as connection flow paths. call. The connection flow path can also be said to be a flow path that branches off from the main flow path and connects to the plurality of heads h1, h2, h3, and h4. For example, the nozzles h1a, h1b, h2a, h2b, h3a, h3b, h4a, h4b, tubes, etc. are included in the connection flow path.

Further, since the force that tries to displace the heads h1, h2, h3, h4 becomes a force that deforms the support plate 120, the nozzles h1a, h1b, h2a, h2b, h3a, h3b, h4a, h4b and the conveyance drum 31 The distance (gap) changes. As a result, the distance between the recording medium P introduced into this gap and the nozzles h1a, h1b, h2a, h2b, h3a, h3b, h4a, h4b also changes, leading to a decrease in printing quality.

Incidentally, the inkjet recording apparatus 10 is a large-sized apparatus in which the recording medium P to be printed is, for example, B1 size or B2 size paper or cloth, and the width of the head unit 100 is 1 to 2 m as described above. Therefore, if a difference in thermal expansion occurs between the members, the positional deviations of the heads h1, h2, h3, and h4 due to this will also increase.

If the connecting flow path consisting of nozzles h1a, h1b, h2a, h2b, h3a, h3b, h4a, h4b, etc. is formed of a flexible material such as a tube, stress caused by the difference in thermal expansion should be avoided. However, if the connecting channel is made of metal such as aluminum to withstand higher temperatures, the stress caused by the difference in thermal expansion will not be absorbed by the connecting channel and will be transferred to the head via the connecting channel. The positions of h1, h2, h3, and h4 are shifted.

With the configuration of the present embodiment, the difference in thermal expansion between the flow path section 130 and the support plate 120 can be reduced, so such inconveniences can be effectively suppressed.

<3> Summary As explained above, according to the present embodiment, the flow path section heaters 141a and 141b raise the temperature of the flow path section 130, and the temperature sensor that detects the temperature of the flow path section 130 and the support plate 120. 151 and 152, and a control unit 300 that controls the difference between the temperature of the flow path section 130 and the temperature of the support plate 120 to be equal to or less than a predetermined value based on the detection results of the temperature sensors 151 and 152. For example, the flow path section heaters 141a and 141b are controlled so that the difference between the temperature of the flow path section 130 and the temperature of the support plate 120 does not become larger than a predetermined value. Thereby, it is possible to suppress a decrease in printing accuracy due to a temperature difference between the members (that is, the flow path section 130 and the support plate 120).

Furthermore, since the inkjet recording apparatus 10 further includes the support plate heater 142 that raises the temperature of the support plate, even when the flow path portion 130 is rapidly heated by the flow path portion heaters 141a and 141b, the support plate heater 142 supports the support plate. By increasing the temperature of the plate 120, the difference between the temperature of the flow path section 130 and the temperature of the support plate 120 can be controlled to be below a predetermined value. Therefore, the difference between the temperature of the flow path section 130 and the temperature of the support plate 120 can be controlled to a predetermined value or less without increasing the warm-up time. In other words, the control section 300 controls the flow path section heaters 141a and 141b so that the temperature of the flow path section 130 becomes a predetermined temperature, while controlling the support plate heater 142 to maintain the temperature of the flow path section 130 and the support plate 120. The temperature difference is controlled to be less than or equal to a predetermined value.

Note that the above-described embodiments are merely examples of implementation of the present invention, and the technical scope of the present invention should not be construed to be limited by these embodiments. That is, the present invention can be implemented in various forms without departing from its gist or main features.

In addition to the configuration of the embodiment described above, a cooler for cooling the support plate 120 may be further provided. This cooler can be realized, for example, by forming holes in the reinforcing plate 122 of the support plate 120 for circulating a refrigerant such as cooling water. By providing a cooler, for example, when the temperature of the head units 101 to 104 rises too much (for example, when the temperature rises to close to 80 [°C]), the heads h1, h2, h3 can be cooled via the support plate 120. , h4 can prevent damage to the piezo element, etc.

In one embodiment of the present invention, using such a cooler, the control unit 300 controls the flow path heaters 141a, 141b, the support plate heater 142, and/or the support plate cooler (not shown). , the difference between the temperature of the flow path section 130 and the temperature of the support plate 120 may be controlled to be equal to or less than a predetermined value.

Further, in one embodiment of the present invention, such a cooler is used to control the flow path section heaters 141a and 141b so that the temperature of the flow path section 130 becomes a predetermined temperature, while controlling the support plate heater 142 to maintain the flow path section 130 at a predetermined temperature. The difference between the temperature of the road portion 130 and the temperature of the support plate 120 may be controlled to be equal to or less than a predetermined value.

Further, in one aspect of the present invention, the control unit 300 controls the flow path heaters 141a, 141b and/or the support plate when the difference between the temperature of the flow path portion 130 and the temperature of the support plate 120 becomes a predetermined value or more. The operation of a cooler (not shown) may be stopped. In this way, even if, for example, the flow path section heaters 141a, 141b or the support plate cooler (not shown) malfunction so as to increase the difference between the temperature of the flow path section 130 and the temperature of the support plate 120, Since the temperature difference can be suppressed within a predetermined value, it is possible to suppress the displacement and damage of the heads h1, h2, h3, and h4.

Further, in one aspect of the present invention, the control unit 300 performs control such that the difference between the temperature of the flow path portion 130 and the temperature of the support plate 120 is equal to or less than a predetermined value when the inkjet recording apparatus 10 is started. The control may also be stopped when the temperature of the support plate 120 satisfies a predetermined condition. For example, the control unit 300 controls when the temperature of the flow path section 130 reaches 80 [°C] while the difference between the temperature of the flow path section 130 and the temperature of the support plate 120 is maintained at 10 [°C] or less. In this case, the above control is stopped. By doing so, it becomes possible to perform control only when it is actually necessary.

Further, in one aspect of the present invention, the control unit 300 performs control such that the difference between the temperature of the flow path unit 130 and the temperature of the support plate 120 is equal to or less than a predetermined value when the printing operation of the inkjet recording apparatus 10 is stopped. You can.

Further, in one aspect of the present invention, the control section 300 may control the temperature of the support plate 120 to be lower than the temperature of the flow path section 130 during the printing operation.

Furthermore, in one aspect of the present invention, the connection flow path provided between the flow path of the flow path portion 130 and the ink ejection ports of the heads h1, h2, h3, and h4 is connected to the flow path portion 130 and the support plate. It may also have a buffer structure that absorbs the difference in thermal expansion with respect to 120.

FIG. 9 is a sectional view showing an example of this buffer structure. In the illustrated example, the nozzles h1a (h1b, h2a, h2b, h3a, h3b, h4a, h4b), which are connection flow paths, are connected to the nozzle mounting portion of the head h1 (h2 to h4) via a buffer member such as an O-ring 161. It is attached to 160. As a result, the nozzle h1a can move relative to the head h1, so even if a difference in thermal expansion occurs between the flow path section 130 and the support plate 120, the nozzle h1a (h1b, h2a, h2b, h3a, h3b, h4a, h4b) can prevent the position of the head h1 (h2 to h4) from shifting.

10 Inkjet recording device 12 Data input section 20 Paper feeding section 21 Paper feeding tray 22, 41 Conveyance belt 30 Recording device main body 31 Conveyance drum 31a to 31c, 32a, 34a1, 34b1, 34c1, 35a Claw section 32, 34a, 34b, 34c , 35 Roller 33 Energy ray irradiation section 36a, 36b Swing arm 40 Paper discharge section 100 Head section 101-104 Head unit 110 Head drive section 120 Support plate 121 Bottom plate 122 Reinforcement plate 130 Channel section 141a, 141b, 142 Heater 151, 152 Temperature sensor 160 Nozzle attachment part 161 O-ring 200 Transport mechanism part 300 Control part a1 Head module h1 to h4 Head h1a, h1b, h2a, h2b, h3a, h3b, h4a, h4b Nozzle P Recording medium

Claims (13)

multiple heads,
a support plate that supports the plurality of heads;
a channel section that supplies ink to the plurality of heads;
a flow path section heater that raises the temperature of the flow path section;
a temperature sensor that detects the temperature of the flow path section and the support plate;
a control unit that controls the difference between the temperature of the flow path portion and the temperature of the support plate to be equal to or less than a predetermined value based on a detection result of the temperature sensor;
An inkjet recording device comprising: further comprising a support plate heater that raises the temperature of the support plate,
The control unit controls the flow path portion heater and the support plate heater so that the difference between the temperature of the flow path portion and the temperature of the support plate is equal to or less than a predetermined value.
The inkjet recording device according to claim 1. further comprising a support plate cooler that cools the support plate,
The control unit controls the flow path heater and the support plate cooler so that the difference between the temperature of the flow path and the temperature of the support plate is equal to or less than a predetermined value.
The inkjet recording device according to claim 1. a support plate heater that raises the temperature of the support plate;
a support plate cooler that cools the support plate;
Furthermore,
The control unit controls the flow path section heater, the support plate heater, and the support plate cooler so that the difference between the temperature of the flow path section and the temperature of the support plate is equal to or less than a predetermined value. do,
The inkjet recording device according to claim 1. further comprising a support plate heater that raises the temperature of the support plate,
The control unit includes:
The flow path section heater is controlled so that the temperature of the flow path section is a predetermined temperature, and the support plate heater is controlled so that the difference between the temperature of the flow path section and the temperature of the support plate is equal to or less than a predetermined value. Control,
The inkjet recording device according to claim 1. further comprising a support plate cooler that cools the support plate,
The control unit includes:
The flow path section heater is controlled so that the temperature of the flow path section is a predetermined temperature, and the support plate cooler is controlled so that the difference between the temperature of the flow path section and the temperature of the support plate is below a predetermined value. to control,
The inkjet recording device according to claim 1. a support plate heater that raises the temperature of the support plate;
a support plate cooler that cools the support plate;
Furthermore,
The control unit includes:
The flow path section heater is controlled so that the temperature of the flow path section is a predetermined temperature, and the support plate heater and the support plate cooler are controlled so that the difference between the temperature of the flow path section and the temperature of the support plate is a predetermined temperature. control so that it is less than or equal to the value,
The inkjet recording device according to claim 1. A connecting flow path provided between the flow path of the flow path portion and the ink ejection port of the head has a buffer structure that absorbs a difference in thermal expansion between the flow path portion and the support plate.
The inkjet recording device according to any one of claims 1 to 7. The control unit stops the operation of the flow path heater when the difference between the temperature of the flow path portion and the temperature of the support plate becomes a predetermined value or more.
The inkjet recording device according to any one of claims 1 to 8. the flow path portion and the support plate are connected and fixed at a substantially central position of the support plate;
The inkjet recording device according to claim 1. The control unit performs the control when the inkjet recording device is started up, and stops the control when the temperature of the flow path portion and the support plate satisfies a predetermined condition.
The inkjet recording device according to any one of claims 1 to 10. The control unit performs the control when the printing operation of the inkjet recording device is stopped.
The inkjet recording device according to any one of claims 1 to 11. The control unit controls the temperature of the support plate to be lower than the temperature of the flow path during printing operation.
The inkjet recording device according to any one of claims 1 to 12.

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