JP2019177531A - Recording device - Google Patents

Abstract

To provide a recording device which can reduce an error in measuring a surface temperature of a medium.SOLUTION: A recording device includes: a recording head which discharges a liquid to a processed surface 91 of a medium 90; a conveying part which conveys the medium 90 in a Y direction; a support part 12 which has a support surface 21 for supporting a supported surface 92 on an opposite side to the processed surface 91 of the medium 90; an irradiation part 45 which irradiates the support surface 21 with a first infrared ray 95; a blowing part 43 which generates an air flow 60 along the support surface 21 toward the Y direction; and an infrared ray sensor 65 which detects a second infrared ray 96 radiated from the medium 90 contactlessly. The infrared ray sensor 65 is arranged on an outer side of the air flow 60, and detects the second infrared ray 96 radiated from the medium 90 from an outer side of the air flow 60.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a recording apparatus.

  2. Description of the Related Art Conventionally, as an example of a recording apparatus, a liquid such as ink is attached to a medium, and then the liquid attached to the medium is heated and dried to fix the components contained in the medium to the medium.

  As means for heating and drying the liquid, an irradiation unit such as an infrared heater and a blowing unit such as a fan can be used. By using the irradiation unit and the air blowing unit in combination, the liquid adhering to the medium is efficiently dried. In this case, a detection unit that detects infrared rays is used to control the irradiation unit and the air blowing unit so that the surface temperature of the medium becomes a desired temperature.

  Then, the recording apparatus determines whether the surface temperature of the medium is a desired temperature by measuring the surface temperature of the medium using the detection unit. If the surface temperature of the medium is not the desired temperature, the output of the irradiation unit and the drive amount of the air blowing unit are controlled so that the surface temperature of the medium becomes the desired temperature. Thereby, the fixing of the component contained in the liquid to the medium is efficiently performed.

  For example, such a recording apparatus is disclosed in Patent Document 1. A recording apparatus (printing apparatus) disclosed in Patent Document 1 will be described. The printing apparatus includes a heating unit that radiates infrared rays to a medium, a blower unit that generates an air flow, and a detection unit that detects infrared rays.

  The airflow generated by the blower is heated by the heating unit. The liquid adhering to the medium is heated and dried by the infrared rays radiated from the heating unit and the heated airflow. In addition, the recording apparatus controls the output of the heating unit based on the surface temperature of the medium measured using the detection unit.

Japanese Patent Laid-Open No. 2018-1501

  However, in the recording apparatus disclosed in Patent Document 1, the detection unit is disposed in an opening formed in the reflection plate of the heating unit. For this reason, when the heated airflow collides with a detection part, there exists a possibility of affecting the detection accuracy of a detection part. Originally, the detection unit is for measuring the surface temperature of the media. However, when the heated airflow collides with the detection unit, the detection unit also measures the temperature of the airflow, which causes an error in the measurement result of the surface temperature of the media.

  An object of the present invention is to provide a recording apparatus that can reduce an error when measuring the surface temperature of a medium.

Hereinafter, means for solving the above-described problems and the effects thereof will be described.
A recording apparatus that solves the above problem includes a recording head that discharges liquid onto a first surface of a medium, a transport unit that transports the medium in a transport direction, and a second surface opposite to the first surface of the medium. A support unit having a support surface that supports the light source, an irradiation unit that irradiates infrared rays toward the support surface, and a blower unit that generates an air flow along the support surface toward the upstream side or the downstream side in the transport direction. And a detection unit that detects infrared rays radiated from the medium in a non-contact manner, and the detection unit is disposed outside the air stream, and detects infrared rays radiated from the medium from outside the air stream. The gist is to do.

  According to this configuration, the detection unit is disposed outside the airflow along the support surface and flowing toward the upstream side or the downstream side in the transport direction. And a detection part detects the infrared rays radiated | emitted from a medium from the outer side of airflow. For this reason, it is suppressed that the airflow which a ventilation part generates collides with a detection part. Therefore, it can suppress that a detection part detects the infrared rays radiated | emitted from airflow. Therefore, an error when measuring the surface temperature of the media can be reduced.

  In the recording apparatus, it is preferable that the detection unit is disposed outside the support surface in a width direction orthogonal to the transport direction and detects infrared rays emitted from the medium from the width direction side.

  According to this configuration, even if an air flow is generated over the entire width of the support surface, the detection unit is disposed outside the support surface in the width direction, and thus the air current is prevented from colliding with the detection unit. can do.

  In the recording apparatus, a partition that blocks electromagnetic waves is provided between the support surface and the detection unit, the partition is formed with an opening, and the detection unit transmits infrared rays emitted from the medium, It is preferable to detect through the opening.

  Originally, the infrared rays detected by the detection unit are infrared rays emitted from the medium. For this reason, electromagnetic waves other than infrared rays radiated from the media become noise for the detection unit. That is, of the infrared rays irradiated from the irradiation unit, the infrared rays reflected by the medium also become noise for the detection unit. According to the said structure, it can suppress that the electromagnetic wave used as noise injects into a detection part in parts other than opening in a partition.

The side view which shows a printing apparatus typically. FIG. 2 is a cross-sectional view taken along line 2-2 shown in FIG. 1. FIG. 3 is a cross-sectional view taken along line 3-3 shown in FIG. 2. FIG. 2 is a block diagram illustrating an electrical configuration of the printing apparatus. Sectional drawing which shows typically the printing apparatus of the 1st modification. Explanatory drawing which shows the relationship between the position in heating space, and the surface temperature of a medium.

Hereinafter, an embodiment of the recording apparatus will be described.
As shown in FIG. 1, a printing apparatus 11, which is an example of a recording apparatus, prints on a support unit 12 that can support a medium 90, a transport unit 13 that transports the medium 90 along the support unit 12, and the medium 90. A printing unit 14 to perform and a heating device 15 to heat the printed medium 90 are provided.

  The printing apparatus 11 is, for example, an ink jet printer that prints images such as characters and photographs on the medium 90 by attaching ink, which is an example of a liquid. The medium 90 is a long one such as continuous paper.

  The support unit 12 includes a first support plate 16, a second support plate 17, and a third support plate 18. Each of the support plates 16, 17, and 18 has support surfaces 19, 20, and 21 for supporting the media 90 that is transported by the transport unit 13, and is a first support in order from the upstream side in the transport direction of the media 90. The plate 16, the second support plate 17, and the third support plate 18 are arranged in this order. Among the support plates 16, 17, and 18, the second support plate 17 is positioned to face the printing unit 14, and the third support plate 18 is positioned to face the heating device 15.

  In the following description, when the transport direction of the medium 90 when passing over the support surface 21 is the Y direction, the direction along the support surface 21 and perpendicular to the Y direction is the X direction. A direction orthogonal to the Y direction and the X direction will be described as the Z direction. The X direction is an example of the width direction of the printing apparatus 11. In the following description, the length along the X direction is simply referred to as “width”. Although the width direction of the printing apparatus 11 in the present embodiment matches the width direction of the long medium 90, it does not need to match. In the following description, a plane including the support surface 21 and extending along the support surface 21 will be described as a virtual plane 93.

  The transport unit 13 includes, in the transport direction of the medium 90, a first rotating shaft 22 positioned upstream of the first support plate 16, a second rotating shaft 23 positioned downstream of the third support plate 18, and Is provided. The first rotating shaft 22 rotatably supports a roll body R1 formed by winding a medium 90 before printing in a roll shape. The second rotating shaft 23 rotatably supports a roll body R2 formed by winding the printed medium 90 in a roll shape.

  The conveyance which conveys the medium 90 between the 1st support plate 16 and the 2nd support plate 17, and between the 2nd support plate 17 and the 3rd support plate 18 by rotating in the state which contact | connected the medium 90. A roller 24 is arranged.

  The printing unit 14 includes a recording head 25 that ejects liquid onto the medium 90, a carriage 26 that holds the recording head 25, and a guide shaft 27 that guides the movement of the carriage 26. The recording head 25 is disposed so as to face the second support plate 17 and can discharge liquid onto the medium 90 supported by the second support plate 17.

  That is, the recording head 25 can eject liquid while reciprocating along with the carriage 26 along the guide shaft 27 extending in the X direction. Then, the printing unit 14 prints images such as characters and graphics on the medium 90 by attaching the liquid ejected from the recording head 25 to the medium 90. The recording head 25 may be a line head extending in the X direction over the entire width of the medium 90.

  The first surface of the medium 90 to which the liquid ejected from the recording head 25 adheres is, for example, a processing surface 91. The processing surface 91 is a surface facing the recording head 25 when the medium 90 is supported on the support surface 20 of the second support plate 17. A second surface that is the back surface of the processing surface 91 is, for example, a supported surface 92. The supported surface 92 is a surface that is supported by the support surfaces 19, 20, and 21 of the support plates 16, 17, and 18.

  The heating device 15 heats the medium 90 on which an image is printed by the printing unit 14 and conveyed by the conveyance unit 13. The heating device 15 heats the processing surface 91 of the medium 90 supported by the third support plate 18 and evaporates the solvent component of the liquid adhering to the medium 90 by heating, whereby the component contained in the liquid is changed to the medium. Fix to 90.

  The heating device 15 is disposed so as to face the support surface 21 of the third support plate 18. The heating device 15 is arranged at an interval with respect to the support surface 21. In the printing apparatus 11, the medium 90 passes between the support surface 21 and the heating device 15.

Hereinafter, the heating device 15 will be described in detail.
As shown in FIGS. 2 and 3, the heating device 15 includes a heating unit 41 for heating the medium 90, a housing 42 for housing the heating unit 41, and a blower unit 43 for blowing gas. Prepare. The heating unit 41 heats the medium 90 supported on the support surface 21 of the third support plate 18. The heating unit 41 is disposed at a position facing the support surface 21. Note that the width of the support surface 21 of the third support plate 18 is wider than the width of the medium 90.

  The heating unit 41 includes an irradiation unit 45 that irradiates infrared rays toward the support surface 21. The irradiation unit 45 is disposed at a position facing the support surface 21. The irradiation unit 45 of the present embodiment includes a first heater tube 451 and a second heater tube 452. The first heater tube 451 and the second heater tube 452 are arranged in the Y direction. The first heater tube 451 and the second heater tube 452 each extend parallel to the X direction. The first heater tube 451 and the second heater tube 452 face the processing surface 91 of the medium 90 when the medium 90 is supported by the support surface 21.

  The heating unit 41 includes a reflecting plate 46 that reflects infrared rays emitted from the first heater tube 451 and the second heater tube 452. The reflection plate 46 is disposed on the opposite side of the support surface 21 of the third support plate 18 with the first heater tube 451 and the second heater tube 452 interposed therebetween. The reflector 46 extends in the X direction. The reflection plate 46 is disposed so as to extend along the Y direction.

  The reflection plate 46 includes a first bending portion 461 that curves in a direction away from the support surface 21 so as to surround a portion of the first heater tube 451 that is opposite to the support surface 21 of the third support plate 18. . The reflection plate 46 includes a second bending portion 462 that curves in a direction away from the support surface 21 so as to surround a portion of the second heater tube 452 opposite to the support surface 21 of the third support plate 18. (See FIG. 3).

  The reflection plate 46 includes a connecting portion 463 that connects an end portion on the Y direction side of the first bending portion 461 and an end portion on the opposite side of the Y direction in the second bending portion 462. The reflection plate 46 reflects infrared rays emitted from the first heater tube 451 and the second heater tube 452 toward the support surface 21 of the third support plate 18. The width of the irradiation unit 45 and the reflection plate 46 is wider than the width of the support surface 21 of the third support plate 18.

  Hereinafter, infrared light that directly enters the support surface 21 or the medium 90 from the irradiation unit 45, infrared light that is reflected by the reflector 46 and incident on the support surface 21 or the medium 90, and reflected by the support surface 21 or the medium 90. Infrared rays will be described as first infrared rays 95 (see FIG. 3). Further, infrared rays emitted from the third support plate 18 and the medium 90 will be described as second infrared rays 96 (see FIG. 2).

  The housing 42 includes an inner wall 51 that surrounds the heating unit 41 and an outer wall 52 that surrounds the inner wall 51. The inner wall 51 and the outer wall 52 extend in the X direction. The widths of the inner wall 51 and the outer wall 52 are the same as the width of the support surface 21 of the third support plate 18. The inner wall 51 is disposed on the opposite side of the irradiation unit 45 with the reflection plate 46 in between in the Z direction. The reflection plate 46 is supported by the inner wall 51.

  As shown in FIG. 3, the outer wall 52 is disposed outside the inner wall 51. Assuming that it is cut along the YZ plane orthogonal to the X direction, the outer wall 52 has a C-shaped cross section that opens toward the support surface 21 in a state of surrounding the inner wall 51, the irradiation unit 45, and the reflection plate 46. It is.

  As shown in FIG. 2, the housing 42 includes a first outer wall 54 that covers the first end 521 in the X direction of the outer wall 52, and a second end 522 that is opposite to the first end 521 in the X direction. And a second outer wall 55 covering the.

  The housing 42 includes a partition wall 53 that separates the heating unit 41 and the first outer wall 54. The partition wall 53 is made of a material that blocks electromagnetic waves, such as copper, aluminum, and iron. That is, the partition wall 53 blocks electromagnetic waves. The partition wall 53 is disposed outside the support surface 21 in the X direction.

  The partition wall 53 and the first outer wall 54 are arranged with a gap in the X direction. In the printing apparatus 11, the storage space 64 isolated from the support surface 21 by the partition wall 53 is partitioned by the partition wall 53 and the first outer wall 54.

  In the printing apparatus 11, the heating space 30 heated by the heating unit 41 is partitioned by the reflection plate 46, the support surface 21 of the third support plate 18, the partition wall 53, and the second outer wall 55. The reflector 46, the support surface 21 of the third support plate 18, the partition wall 53, and the second outer wall 55 are not limited to being connected to each other, and may be arranged with a gap therebetween. The support surface 21 faces the heating space 30 when the medium 90 is not supported.

  In the heating space 30, the support surface 21 and the medium 90 are heated by the first infrared ray 95 irradiated from the irradiation unit 45. That is, the first infrared ray 95 is incident on the support surface 21 and the medium 90 over the entire region facing the heating unit 41. It can be said that the heating unit 41 irradiates the first infrared ray 95 toward the virtual plane 93. Further, the gas in the heating space 30 is heated by the first infrared ray 95 irradiated from the irradiation unit 45.

  In the printing apparatus 11, the flow path 44 that circulates the gas flowing through the heating space 30 is partitioned by the inner wall 51, the outer wall 52, the partition wall 53, and the second outer wall 55. That is, the housing 42 includes a flow path 44. The flow path 44 is open at both ends in the Y direction toward the support surface 21.

  As shown in FIG. 3, the flow path 44 is partitioned so as to surround the heating unit 41. The channel 44 includes an inlet 57 for allowing gas to flow into the channel 44 and an outlet 58 for blowing gas out of the channel 44. The inlet 57 and the outlet 58 are open to the heating space 30. Thereby, the flow path 44 and the heating space 30 for heating the medium 90 communicate with each other.

  The inflow port 57 is located on the Y direction side of the heating unit 41. The blower outlet 58 is located in the direction opposite to the Y direction from the heating unit 41. The blower outlet 58 is opened to face the Y direction side. In other words, the air outlet 58 is opened so that the gas blown out from the air outlet 58 flows toward the Y direction where the inflow port 57 is located.

  As shown in FIGS. 2 and 3, the air blower 43 is disposed in the flow path 44. The air blowing unit 43 causes the gas in the flow path 44 to flow toward the air outlet 58. Further, the air blower 43 causes the gas in the flow path 44 to flow, so that the gas flows into the flow path 44 from the inflow port 57. For example, the gas in the flow path 44 is air. In the present embodiment, the air blowing unit 43 is a plurality of fans 431 arranged in the X direction with a gap therebetween. The air blowing unit 43 may be a plurality of fans arranged in the X direction without leaving a gap, or a single fan, or may be a pump.

  When the air blowing unit 43 is driven, gas is blown out from the air outlet 58 as indicated by an arrow A. The gas blown out from the outlet 58 collides with the medium 90 supported by the support surface 21 and then flows in the Y direction along the support surface 21 or the processing surface 91 as indicated by an arrow B.

  A part of the gas blown out from the outlet 58 and flowing along the processing surface 91 flows into the inlet 57 as indicated by an arrow C. The gas flowing into the inflow port 57 flows toward the blower unit 43 as indicated by an arrow D. That is, part of the gas circulates through the flow path 44 and the heating space 30. The flow path 44 and the heating space 30 constitute a gas circulation path 59. A part of the gas blown out from the outlet 58 and flows along the processing surface 91 is discharged to the outside of the circulation path 59 from between the inlet 57 and the support surface 21 as indicated by an arrow E.

  As described above, the blower unit 43 generates the airflow 60 along the support surface 21 in the Y direction that is the downstream side in the transport direction. The airflow 60 shown in this specification means a gas flow blown from the blowout port 58. That is, in the airflow 60 shown in this specification, the gas flow blown out from the blowout port 58 is incidentally generated around the gas flow blown out from the blowout port 58 by entraining the surrounding gas. Does not include entrainment airflow.

  The generation range of the airflow 60 can be specified by mixing fine particles to visualize the gas and observing or photographing the visualized gas flow. The generation range of the airflow 60 can be specified by measuring the wind speed and the wind direction at multiple points using a wind speed sensor. Further, the generation range of the airflow 60 can be specified by simulation based on the structure for partitioning the heating space 30 and the driving amount of the blower unit 43.

  As shown in FIG. 2, when it is assumed that the cutting is performed in the XZ plane orthogonal to the Y direction, the air flow 60 is generated in the entire region of the cross section of the heating space 30. The widths of the inlet 57 and the outlet 58 are the same as the support surface 21 of the third support plate 18. The width of the heating space 30 is wider than the support surface 21 of the third support plate 18. For this reason, the airflow 60 is generated over the entire width of the support surface 21 of the third support plate 18. That is, when the medium 90 is supported by the support surface 21, the airflow 60 is generated over the entire width of the processing surface 91 of the medium 90.

  The gas circulating through the circulation path 59 is heated by the heating unit 41. Since the flow path 44 is positioned so as to surround the heating unit 41, the temperature in the flow path 44 increases due to the heat generated by the heating unit 41. That is, the circulating gas passes through the flow path 44 so that the heat generated by the heating unit 41 can be recovered, and the circulating gas can be warmed and reused for drying.

  When the heating unit 41 heats the medium 90, vapor is generated mainly by evaporation of the solvent component in the liquid adhering to the medium 90. When the humidity of the circulation path 59 rises due to this steam, the media 90 becomes difficult to dry. The heating device 15 discharges steam together with a part of the gas blown out from the outlet 58 to the outside of the circulation path 59 from between the inlet 57 and the support surface 21. Thereby, an increase in humidity in the circulation path 59 is suppressed.

  The heating device 15 dries the medium 90 by blowing a gas on the medium 90 while heating the medium 90 supported by the support surface 21. That is, when the printed medium 90 is transported along the support unit 12 and reaches the heating space 30, the liquid adhering to the medium 90 is generated by the heat generated by the irradiation unit 45 and the gas blown out from the outlet 58. Of these, evaporation of the solvent component is promoted. The heating device 15 dries the processing surface 91 by the infrared rays from the irradiation unit 45 and the blowing of gas by the blowing unit 43.

  As shown in FIGS. 2 and 3, the printing apparatus 11 includes an infrared sensor 65 that is an example of a detection unit that detects infrared rays in a non-contact manner. The infrared sensor 65 is configured to detect the second infrared ray 96 emitted from the support unit 12 or the medium 90 in a non-contact manner.

  As shown in FIG. 2, the infrared sensor 65 includes a light receiving window 651 having a predetermined area and a light receiving element 652. As shown by the dot pattern in the figure, the light receiving region 67 of the infrared sensor 65 is in the range of the viewing angle d1 with the normal at the center point of the light receiving element 652 as the center. Here, the viewing angle d1 is represented by a plane angle (radian) or a solid angle (steradian). In the following description, for the sake of simplicity, reference will be made to the reflection of infrared rays in the Y direction, and the viewing angle d1 and the reflection angle (incident angle) will be expressed by plane angles. However, this includes the case of reflection not only in the Y direction but also in the X direction. In this case, the viewing angle d1 and the reflection angle (incident angle) are expressed as solid angles.

  Infrared rays that enter the light receiving window 651 within the range of the viewing angle d1 reach the light receiving element 652. Even if the infrared light is incident on the light receiving window 651, the infrared light incident at an angle outside the range of the viewing angle d1 does not reach the light receiving element 652. That is, the infrared sensor 65 can detect infrared rays incident on the light receiving window 651 within the range of the viewing angle d1, but does not detect infrared rays incident on the light receiving window 651 in a range outside the viewing angle d1.

  The printing apparatus 11 includes a substrate 68 that is supported in the storage space 64. An infrared sensor 65 is mounted on the substrate 68. The infrared sensor 65 is supported in the storage space 64 through the substrate 68. That is, the infrared sensor 65 is stored in the storage space 64.

  The partition wall 53 has an opening 531 that penetrates in the X direction and has a predetermined area. The area of the opening 531 may be any size as long as it does not shield the light receiving region 67 when passing through the light receiving region 67 of the infrared sensor 65. The light receiving area 67 of the infrared sensor 65 extends in a direction intersecting the virtual plane 93. The light receiving area 67 of the infrared sensor 65 extends so as to pass through the opening 531 of the partition wall 53.

  As described above, the infrared sensor 65 is disposed outside the support surface 21 in the X direction. The infrared sensor 65 detects the second infrared ray 96 emitted from the medium 90 from the X direction side. The infrared sensor 65 of this embodiment detects the second infrared ray 96 emitted from the processing surface 91 in the medium 90. The infrared sensor 65 is disposed outside the airflow 60. The infrared sensor 65 detects the second infrared ray 96 emitted from the medium 90 from the outside of the airflow 60.

  The printing apparatus 11 includes a partition wall 53 that blocks electromagnetic waves between the infrared sensor 65 and the support surface 21. The infrared sensor 65 detects the second infrared ray 96 emitted from the medium 90 through the opening 531. It can be said that the partition wall 53 isolates the infrared sensor 65 from the airflow 60.

As shown in FIG. 3, the infrared sensor 65 of the present embodiment is provided at a position where it is difficult to detect the first infrared ray 95 reflected by the medium 90.
The infrared sensor 65 has a reflection angle in the Y direction of the first infrared ray 95 reflected by the medium 90 out of the range of the viewing angle d1 of the infrared sensor 65 out of the first infrared ray 95 emitted from the first heater tube 451. It is provided in the position. In other words, the range of the reflection angle in the Y direction of the first infrared ray 95 reflected by the medium 90 does not overlap the range of the viewing angle d1 of the infrared sensor 65. Furthermore, the infrared sensor 65 is arranged so that the reflection component of the first infrared ray 95 reflected from the Y direction does not enter the range of the viewing angle d1 of the infrared sensor 65. In addition, reflection here means regular reflection, for example.

  The infrared sensor 65 has a reflection angle in the Y direction of the first infrared ray 95 reflected by the medium 90 out of the first infrared ray 95 emitted from the second heater tube 452 in the range of the viewing angle d1 of the infrared sensor 65. It is provided at an outer position. In other words, the range of the reflection angle in the Y direction of the first infrared ray 95 reflected by the medium 90 does not overlap the range of the viewing angle d1 of the infrared sensor 65. Furthermore, the infrared sensor 65 is arranged so that the reflection component of the first infrared ray 95 reflected from the Y direction does not enter the range of the viewing angle d1 of the infrared sensor 65. In addition, reflection here means regular reflection, for example.

  The infrared sensor 65 of the present embodiment is closer to the support surface 21 than the irradiation unit 45 when viewed from the X direction. The infrared sensor 65 is disposed between the two heater tubes 451 and 452 when viewed from the X direction. That is, the light receiving region 67 of the infrared sensor 65 is between the two heater tubes 451 and 452 in the Y direction. The opening 531 is formed in the partition wall 53 so as to have a position and a size that do not block the light receiving region 67 of the infrared sensor 65.

Next, the electrical configuration of the printing apparatus 11 will be described.
As illustrated in FIGS. 1 and 4, the printing apparatus 11 includes a control unit 70. The control unit 70 includes a CPU 71 and a storage unit 72 including a RAM and a ROM. The storage unit 72 stores various programs for controlling the printing apparatus 11. The control unit 70 may be configured to include dedicated hardware (an application specific integrated circuit: ASIC) that executes at least some of the various processes. That is, the control unit 70 may be configured to include one or more processors that operate according to a computer program (software), one or more dedicated hardware such as an ASIC, or a combination thereof. The processor includes a CPU and memories such as a RAM and a ROM. The memory stores program code or instructions configured to cause the CPU to execute processing. Memory, which is an example of a computer-readable medium, includes anything that can be accessed by a general purpose or special purpose computer.

  The heating device 15 includes a motor 75 that drives the blower unit 43 and a drive circuit 76 that drives the motor 75. The drive circuit 76 controls the drive amount of the blower unit 43 by controlling the voltage applied to the motor 75. The drive circuit 76 may be able to control the drive amount of the blower unit 43 by performing PWM control. That is, the drive circuit 76 only needs to be able to control the drive amount of the blower unit 43 by the control of the motor 75.

  The control unit 70 is electrically connected to the irradiation unit 45, the drive circuit 76, the transport unit 13, and the printing unit 14. The control unit 70 operates the printing apparatus 11 by controlling the irradiation unit 45, the drive circuit 76, the transport unit 13, and the printing unit 14.

  The control unit 70 is electrically connected to the infrared sensor 65. The control unit 70 receives a detection signal output by the infrared sensor 65 detecting and outputting infrared rays. The controller 70 can monitor the surface temperature T of the processing surface 91 in the medium 90 based on the detection signal input from the infrared sensor 65. As described above, the control unit 70 controls the irradiation unit 45 and the drive circuit 76. Therefore, the control unit 70 and the infrared sensor 65 can be said to be part of the heating device 15.

  The control unit 70 controls the drive circuit 76 based on the measured surface temperature T of the processing surface 91. Thereby, the voltage applied to the motor 75 changes based on the measurement result of the surface temperature T of the processing surface 91. That is, the driving amount of the blower 43 is changed based on the measurement result of the surface temperature T of the processing surface 91. When the driving amount of the blower 43 changes, the wind speed of the gas blown from the blower 43 changes. The greater the driving amount of the blower 43, the faster the gas wind speed.

Hereinafter, control of the heating device 15 performed by the control unit 70 will be described.
The control unit 70 controls the output of the irradiation unit 45. The control unit 70 keeps the output of the irradiation unit 45 constant at the maximum output. Here, “constant” includes output fluctuations that do not affect the temperature emitted by the irradiating unit 45 or that the influence on the temperature emitted by the irradiating unit 45 can be ignored. That is, output fluctuations that do not affect the drying of the media 90 are included in “constant”.

  The control unit 70 changes the wind speed of the gas flowing through the heating space 30 by changing the drive amount of the blower unit 43 based on the measurement result of the surface temperature T of the processing surface 91. In addition to or instead of the measurement result of the surface temperature T of the processing surface 91, the control unit 70 may change the blowing unit according to at least one of the type of the medium 90 and the amount of liquid discharged to the medium 90. The driving amount of 43 may be changed.

  The control unit 70 of the present embodiment is configured so that the surface temperature T of the processing surface 91 does not exceed the allowable temperature, and the evaporation amount of the solvent component necessary for drying the liquid attached to the medium 90 can be secured. The drive amount of the unit 43 is controlled. The “allowable temperature” here is determined based on the results of simulation and experiment so as not to damage the medium 90 and the liquid attached to the medium 90.

  The surface temperature T of the processing surface 91 is lowered by increasing the wind speed of the gas blown from the blower unit 43. The surface temperature T of the processing surface 91 rises by slowing the wind speed of the gas blown from the blower unit 43. This is because the amount of heat taken from the irradiation unit 45 increases as the wind speed increases, and the ventilation rate of the gas circulating in the circulation path 59 increases, so that the temperature of the gas circulating in the circulation path 59 decreases. To do.

Next, the operation of the printing apparatus 11 will be described.
The control unit 70 of the present embodiment measures the surface temperature T of the processing surface 91 of the medium 90 based on the detection result of the second infrared ray 96 by the infrared sensor 65. And the control part 70 changes the drive amount of the ventilation part 43 based on the measurement result of the surface temperature T of the process surface 91 so that the surface temperature T of the process surface 91 may not exceed permissible temperature.

  Assume that the airflow 60 collides with the infrared sensor 65. In this case, the infrared sensor 65 is more likely to detect infrared rays emitted from the heated airflow 60. Originally, the infrared sensor 65 is provided for detecting the second infrared ray 96 emitted from the medium 90 and measuring the surface temperature T of the medium 90. The infrared rays emitted from the airflow 60 that collides with the infrared sensor 65 become noise when the second infrared rays 96 emitted from the medium 90 are detected. That is, the collision of the airflow 60 with the infrared sensor 65 causes an error in the measurement result of the surface temperature T of the medium 90.

  On the other hand, as shown in FIG. 2, the infrared sensor 65 of the present embodiment is disposed outside the airflow 60. For this reason, it is suppressed that the heated airflow 60 collides with the infrared sensor 65 directly. Therefore, it is possible to suppress the infrared rays emitted from the heated airflow 60 from being detected by the infrared sensor 65.

  The infrared sensor 65 is disposed outside the airflow 60 in the X direction orthogonal to the Y direction, which is an example of the traveling direction of the airflow 60. For this reason, compared with the configuration in which the infrared sensor 65 is disposed outside the airflow 60 on the traveling direction side of the airflow 60, a part of the airflow 60 can be prevented from reaching the infrared sensor 65.

  The infrared sensor 65 of this embodiment is disposed outside the support surface 21 in the X direction. Therefore, even when the airflow 60 is generated over the entire width of the support surface 21 as in this embodiment, the airflow 60 can be prevented from colliding with the infrared sensor 65. Then, by generating the airflow 60 over the entire width of the support surface 21, it is possible to heat the medium 90 evenly over the entire width.

  A partition wall 53 exists between the support surface 21 and the infrared sensor 65. That is, the heating space 30 and the storage space 64 are separated by the partition wall 53. For this reason, even if it is a case where the advancing direction of the airflow 60 changes with the airflow which approached from the exterior of the heating space 30, it is suppressed that the airflow 60 collides with the infrared sensor 65. FIG.

  The electromagnetic wave that becomes noise when the infrared sensor 65 detects the second infrared ray 96 is not limited to the infrared ray radiated from the air flow 60 when the air flow 60 collides with the infrared sensor 65. For example, there are infrared rays irregularly reflected in the X direction by the medium 90 and infrared rays emitted from the heated reflector 46 and the inner wall 51.

  On the other hand, the partition wall 53 of the present embodiment is configured to block electromagnetic waves. For this reason, it is possible to prevent electromagnetic waves that become noise from entering the infrared sensor 65 at least in the portion other than the opening 531 in the partition wall 53. Moreover, it can suppress that the temperature in the storage space 64 in which the infrared sensor 65 is stored rises.

  Further, the partition wall 53 of the present embodiment is disposed outside the airflow 60 in the X direction. For this reason, when the airflow 60 contacts the partition wall 53, it can suppress that the partition wall 53 is heated. Therefore, the amount of infrared rays emitted from the partition wall 53 can be reduced. That is, it is possible to suppress the gas in the storage space 64 from being heated by the infrared rays emitted from the partition wall 53.

  Further, in the infrared sensor 65 of the present embodiment, the reflection angle of the first infrared ray 95 reflected by the medium 90 is the viewing angle d1 of the infrared sensor 65 for both of the two heater tubes 451 and 452 constituting the irradiation unit 45. It is arranged at a position outside the range. Therefore, it is possible to prevent the infrared sensor 65 from detecting a component that becomes noise when the surface temperature T of the medium 90 is measured.

According to the above embodiment, the following effects can be obtained.
(1) The infrared sensor 65 is disposed outside the airflow 60 and detects the second infrared ray 96 from the outside of the airflow 60. Therefore, an error when measuring the surface temperature T of the medium 90 can be reduced.

  (2) The infrared sensor 65 is disposed outside the support surface 21 in the X direction which is an example of the width direction. The infrared sensor 65 detects the second infrared ray 96 from the X direction side. For this reason, even if the airflow 60 is generated over the entire width of the support surface 21, the airflow 60 is prevented from colliding with the infrared sensor 65.

  (3) The printing apparatus 11 includes a partition wall 53 that blocks electromagnetic waves between the support surface 21 and the infrared sensor 65. For this reason, it can suppress that the electromagnetic wave used as noise is detected by the infrared sensor 65.

  (4) The heating space 30 and the storage space 64 are separated by the partition wall 53. For this reason, it can suppress that ambient temperature of the infrared sensor 65 and the infrared sensor 65 rises.

  (5) Moreover, even when the airflow 60 is disturbed by the airflow entering from the outside of the heating space 30, the airflow 60 can be prevented from colliding with the infrared sensor 65.

  (6) The partition wall 53 is disposed outside the airflow 60 in the X direction. Therefore, it is possible to prevent the infrared sensor 65 from being indirectly heated by heating the partition wall 53.

  (7) The infrared sensor 65 is disposed at a position where the reflection angle of the first infrared ray 95 reflected by the medium 90 is outside the range of the viewing angle d1 of the infrared sensor 65 for both of the two heater tubes 451 and 452. ing. Therefore, it is possible to prevent the infrared sensor 65 from detecting a component that becomes noise when the surface temperature T of the medium 90 is measured.

  You may change the said embodiment like the example of a change shown below. Further, the configuration included in the above embodiment and the configuration included in the following modification example may be arbitrarily combined, and the configurations included in the following modification example may be arbitrarily combined. In addition, in the following description, the same code | symbol is attached | subjected to what has a function similar to the component mentioned above, and the overlapping description is abbreviate | omitted.

  As in the first modification shown in FIGS. 5 and 6, the infrared sensor 65 detects the second infrared ray 96 emitted from the position where the surface temperature T is the highest among the media 90 in the heating space 30. It may be configured to be possible.

  The first position P1 is a position where the medium 90 enters the heating space 30, the second position P2 is a position facing the first heater tube 451 in the Z direction, and the fifth position P5 is the first position in the Z direction. This is the position facing the two heater tube 452. The third position P3 and the fourth position P4 are positions between the second position P2 and the fifth position P5 in the Y direction, and the sixth position P6 and the seventh position P7 are more in the Y direction than the fifth position P5. Side position.

  As shown in FIG. 6, in the heating space 30, the surface temperature T of the processing surface 91 of the medium 90 is the lowest at the first position P <b> 1 where the medium 90 enters the heating space 30, and faces the first heater tube 451. Ascend toward the second position P2. The surface temperature T of the processing surface 91 reaches the first peak at the third position P3 that has passed through the second position P2, and decreases toward the fourth position P4.

  The surface temperature T of the processing surface 91 rises again toward the fifth position P5 facing the second heater tube 452, and reaches the second peak at the sixth position P6 that has passed through the fifth position P5. It decreases toward the seventh position P7. That is, the surface temperature T of the processing surface 91 becomes the highest when passing through the sixth position P6 in the heating space 30.

  As shown in FIG. 5, the infrared sensor 65 in the first modified example is arranged such that the light receiving region 67 extends in a direction intersecting the support surface 21 at the sixth position P6. That is, the infrared sensor 65 detects the second infrared ray 96 emitted from the medium 90 passing through the sixth position P6. In the first modification, the infrared sensor 65 is stored in the storage space 64. That is, the infrared sensor 65 detects the second infrared ray 96 through the opening 531 of the partition wall 53.

  According to the configuration of the first modification, the surface temperature T of the processing surface 91 is determined by measuring the surface temperature T of the processing surface 91 at a position where the surface temperature T of the processing surface 91 is highest in the heating space 30. The control unit 70 can directly determine whether or not the allowable temperature is exceeded. For this reason, the control unit 70 can more appropriately control the drive amount of the blower unit 43 so that the surface temperature T of the medium 90 does not exceed the allowable temperature.

  Note that the infrared sensor 65 of the first modified example is such that the reflection angle of the first infrared 95 reflected by the medium 90 is the viewing angle of the infrared sensor 65 for both of the two heater tubes 451 and 452 constituting the irradiation unit 45. It is arranged at a position outside the range of d1.

  As in the first modification shown in FIG. 5, the infrared sensor 65 may be arranged on the downstream side in the transport direction with respect to the irradiation unit 45. That is, the infrared sensor 65 may be disposed on the Y direction side with respect to the second heater tube 452. Even in the configuration of the first modification, the reflection angle of the first infrared ray 95 reflected by the medium 90 can be outside the range of the viewing angle d1 of the infrared sensor 65. Conversely, the infrared sensor 65 may be arranged on the opposite side of the Y direction from the first heater tube 451.

  In the heating device 15, the width of the inlet 57 and the outlet 58 may be wider than the support surface 21 of the third support plate 18. In the heating device 15, the width of the inlet 57 and the outlet 58 may be narrower than the support surface 21 of the third support plate 18. That is, the air blowing unit 43 may generate the airflow 60 over the entire width of the support surface 21 or may generate the airflow 60 in a range narrower than the width of the support surface 21.

-In the heating apparatus 15, the blower outlet 58 may be divided | segmented into plurality along the X direction. That is, the air blower 43 may be configured to generate a plurality of airflows 60.
-In the heating apparatus 15, the ventilation part 43 may make a ventilation direction into the opposite direction. That is, the air blower 43 may generate the airflow 60 toward the upstream side in the transport direction by switching the positions of the inlet 57 and the outlet 58 in the above embodiment.

  In the heating device 15, the housing 42 may not include the partition wall 53. In this case, the infrared sensor 65 detects the second infrared ray 96 emitted from the medium 90 without passing through the opening 531.

  In the heating device 15, the housing 42 may not include the first outer wall 54. That is, the storage space 64 may be separated from the support surface 21 by the partition wall 53. The storage space 64 may be a space that does not have an opening other than the opening 531, or may be a space that has an opening different from the opening 531.

In the heating device 15, the housing 42 may not include the second outer wall 55.
The printing apparatus 11 may have a configuration including a plurality of infrared sensors 65 as an example of a detection unit. For example, when the infrared sensor 65 in the above embodiment is the first infrared sensor 65, the second infrared sensor 65 may be provided on the second end 522 side.

  The printing apparatus 11 may include an infrared transmitting member that covers the opening 531 of the partition wall 53. The infrared transmitting member may be a plate having a predetermined thickness or a thin film. According to the configuration of this modified example, it is possible to further suppress the airflow 60 from colliding with the infrared sensor 65.

  The position of the infrared sensor 65 may be changed to any position as long as it is outside the airflow 60. For example, the infrared sensor 65 may be disposed inside the both ends of the support surface 21 in the X direction and outside the airflow 60. The infrared sensor 65 may be disposed on the traveling direction side of the airflow 60 and on the side opposite to the air outlet 58 with the inflow port 57 interposed therebetween.

  The infrared sensor 65 may be disposed on the opposite side of the irradiation unit 45 with at least one of the support surface 21 and the virtual plane 93 interposed therebetween. In this case, the control unit 70 measures the surface temperature T of the supported surface 92 of the medium 90 using the infrared sensor 65. Based on the measurement result of the surface temperature T of the supported surface 92, the control unit 70 determines the output of the irradiation unit 45 and the driving amount of the blower unit 43 so that the surface temperature T of the processing surface 91 does not exceed the allowable temperature. Control at least one.

  The printing apparatus 11 may have a configuration in which one or a plurality of support plates that can be arbitrarily selected from the support plates 16, 17, and 18 are replaced with a conveyance belt. Further, the third support plate 18 may include a plurality of parts each having a support surface 21.

The support surface 21 is not limited to a smooth surface that does not include a structure. The support surface 21 may be configured to include a plurality of convex portions extending along the Y direction or the X direction.
The irradiation unit 45 is not limited to the two heater tubes 451 and 452. The irradiation unit 45 may be one or three or more heater tubes, and may include a panel type or spherical type irradiation unit.

  The infrared sensor 65 may change the direction of the light receiving region 67 in an arbitrary direction as long as the second infrared ray 96 emitted from the medium 90 can be incident through the opening 531 of the partition wall 53.

  The infrared sensor 65 is supported so that the light receiving region 67 extends toward a blank space such as an opening formed in the third support plate 18 in a state where the medium 90 is not supported by the support surface 21. Also good. In this case, the control unit 70 may be configured to be able to determine whether or not the medium 90 is in the heating space 30 based on the detection result of the infrared sensor 65. According to this modification, the sensor for detecting whether or not the medium 90 is in the heating space 30 and the sensor for measuring the surface temperature T of the medium 90 can be shared.

  The control unit 70 controls at least one of the output of the irradiation unit 45 and the wind speed of the gas blown from the air blowing unit 43 based on the measured surface temperature T of the processing surface 91, thereby It is preferable to control the surface temperature T.

  The control unit 70 may change the output of the irradiation unit 45 based on the measured surface temperature T of the processing surface 91 while controlling the air velocity of the gas blown from the blowing unit 43 to be constant. Further, the control unit 70 may change both the output of the irradiation unit 45 and the wind speed of the gas blown from the blower unit 43 based on the measured surface temperature T of the processing surface 91.

The control unit 70 may change the output of the irradiation unit 45 according to at least one of the amount of liquid ejected to the medium 90 and the type of the medium 90.
The inflow port 57 does not have to be opened at a position that can face the processing surface 91. For example, the inflow port 57 may be opened to take in gas from the outside of the heating space 30. In this case, the gas blown by the blower 43 may not circulate.

  The air blowing unit 43 may generate the airflow 60 without passing through the flow path 44. For example, the air blowing unit 43 may be disposed so as to face the processing surface 91, and when the air blowing unit 43 is driven, gas may be blown to the processing surface 91. In this case, the housing 42 may not have the flow path 44.

-You may provide the control part which controls the heating apparatus 15, and the control part which controls the printing part 14 and the conveyance part 13 separately.
The heating device 15 may be configured to be detachable from the printing device 11.

The printing apparatus 11 may be a page printer that prints page by page. That is, the medium 90 is not limited to a long one, and may be a short one.
The medium 90 is not limited to recording paper, and may be a resin film, textile, coated paper, wallpaper, or the like.

  The liquid ejected by the printing unit 14 is not limited to ink, and may be, for example, a liquid material in which functional material particles are dispersed or mixed in the liquid. For example, the printing unit 14 discharges a liquid material containing a material such as an electrode material or a color material (pixel material) used for manufacturing a liquid crystal display, an EL (electroluminescence) display, and a surface emitting display in a dispersed or dissolved state. May be.

DESCRIPTION OF SYMBOLS 11 ... Printing apparatus, 12 ... Support part, 13 ... Conveyance part, 15 ... Heating device, 18 ... 3rd support plate, 21 ... Support surface, 25 ... Recording head, 41 ... Heating part, 42 ... Case, 43 ... Air blow 431 ... fan, 44 ... flow path, 45 ... irradiation unit, 451 ... first heater tube, 46 ... reflecting plate, 461 ... first bending portion, 463 ... connecting portion, 51 ... inner wall, 52 ... outer, 521 ... First end portion, 522 ... second end portion, 53 ... partition wall, 531 ... opening, 54 ... first outer wall, 55 ... second outer wall, 58 ... outlet, 59 ... circulation path, 60 ... airflow, 64 ... Storage space, 65 ... infrared sensor, 651 ... light receiving window, 652 ... light receiving element, 67 ... light receiving region, 68 ... substrate, 90 ... media, 91 ... treated surface, 92 ... supported surface, 93 ... virtual plane, 95 ... first 1 infrared ray, 96 ... second infrared ray, d1 ... viewing angle, X, Y, Z ... direction.

Claims (3)

A recording head for discharging liquid onto the first surface of the medium;
A transport unit for transporting the media in the transport direction;
A support portion having a support surface for supporting a second surface opposite to the first surface of the media;
An irradiating unit for irradiating infrared rays toward the support surface;
A blower unit that generates an air flow along the support surface toward the upstream side or the downstream side in the transport direction, and
A non-contact detection unit for detecting infrared rays emitted from the medium, and
The recording device is arranged outside the air stream, and detects infrared rays radiated from the medium from the outside of the air stream. The recording apparatus according to claim 1,
The recording device is disposed outside the support surface in a width direction orthogonal to the transport direction, and detects infrared rays radiated from the medium from the width direction side. The recording apparatus according to claim 1 or 2,
Between the support surface and the detection unit, provided with a partition that blocks electromagnetic waves,
An opening is formed in the partition wall,
The recording apparatus, wherein the detection unit detects infrared rays radiated from the medium through the opening.