JP2018158463A - Printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a printer capable of inhibiting unevenness of temperature distribution, which occurs in a width direction of a medium during heating of the medium, with a simple structure.SOLUTION: A printer includes: a support part 60 having a support surface 64 for supporting a medium M; a heating device 70 which radiates infrared rays to the support surface 64 over a width direction X; and side covers 73 which are provided at both sides of the support surface 64 in the width direction X and have side reflection surfaces 731 for reflecting the infrared rays directed toward the outer side of the support surface 64 in the width direction. When a center portion of the support surface 64 as seen in the width direction X is referred to as a first supporting surface 641 and outer portions of the first supporting surface 641 as seen in the width direction X are referred to as the second support surfaces 642, each second support surface 642 has an absorption rate higher than that of the side reflection surface 731.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a printing apparatus.

  2. Description of the Related Art Conventionally, as an example of a printing apparatus, a printer including an image forming unit that forms an image on a medium such as paper and a heating apparatus that heats the medium to fix the image on the medium is known. For example, Patent Document 1 discloses an infrared radiation heater that radiates infrared rays to a medium, a back reflector installed on the back of the infrared radiation heater, and a side reflector installed on the side of the infrared radiation heater. Are described. The heating device moves the side reflector in the width direction according to the width of the medium, and returns the infrared rays leaking to both sides of the width direction to both ends in the width direction of the medium, thereby heating the medium uniformly in the width direction. To do.

JP 2010-164787 A

  However, in the printing apparatus as described above, it is necessary to configure the side reflector so as to be movable according to the width of the medium. For this reason, the room for improvement was left about the point which simplifies the structure of a heating apparatus. The subject of this invention is providing the printing apparatus which can suppress that the temperature distribution in the width direction of a medium at the time of heating a medium becomes non-uniform | heterotic with a simple structure.

Hereinafter, means for solving the above-described problems and the effects thereof will be described.
A printing apparatus that solves the above-described problem is provided on both sides of the support surface in the width direction, a support portion having a support surface that supports the medium, a heating device that irradiates the support surface with infrared rays across the width direction. A side reflection plate having a side reflection surface that reflects infrared rays toward the outside in the width direction of the support surface, and in the support surface, a central portion in the width direction is a first support surface, When the outer side portion in the width direction than the first support surface is the second support surface, the second support surface has a higher absorptance than the side reflection surface.

  According to the above configuration, the second support surface constituting the outer portion in the width direction on the support surface has an absorptance higher than that of the side reflection surface. The second support surface easily absorbs infrared rays reflected by the surface. For this reason, the infrared absorption amount of the both ends in the width direction of a support part increases, and it becomes difficult for the temperature of the both ends in the width direction of a support part to fall. Therefore, it is possible to prevent the temperature distribution in the width direction of the medium supported by the support portion from becoming non-uniform regardless of the length in the width direction of the medium.

In the printing apparatus, it is preferable that the first support surface has a lower absorptance than the second support surface.
In the above configuration, since the first support surface has a lower absorption rate than the second support surface, for example, processing for setting the absorption rate of the first support surface to be equal to or higher than the absorption rate of the second support surface or The material selection need not be the first support surface. On the other hand, the central portion in the width direction of the support portion having the first support surface has a temperature that is less likely to transfer heat to the outside than both end portions in the width direction of the support portion having the second support surface. It is hard to decline. For this reason, it can suppress that the temperature distribution in the width direction of the medium supported by a support part with a simpler structure becomes non-uniform | heterogenous.

In the printing apparatus, it is preferable that the support portion is made of aluminum, and the second support surface is anodized.
According to the said structure, the structure which raises the absorption factor of a 2nd support surface is implement | achieved easily.

It is preferable that the printing apparatus further includes an air flow generation unit that generates an air flow in a heating region between the heating device and the support unit.
According to the said structure, it can suppress that the temperature of a heating area | region becomes non-uniform | heterogenous by the airflow which generate | occur | produces in a heating area | region. As a result, it is possible to suppress the temperature distribution in the width direction of the support portion and the medium supported by the support portion from becoming uneven.

  In the printing apparatus, in the heating region, a speed difference is generated between an airflow generated in a region facing the first support surface and an airflow generated in a region facing the second support surface. In addition, it is preferable to drive the air flow generation unit.

  According to the above configuration, a pressure difference is generated between the region facing the second support surface and the region facing the first support surface, so that an air flow from a high pressure region to a low pressure region is easily generated. Become. As a result, a relatively high temperature gas in a region facing the first support surface and a relatively low temperature gas in a region facing the second support surface are mixed. In this way, it is possible to further suppress the temperature distribution in the width direction of the support part and the medium supported by the support part from becoming non-uniform.

1 is a side view illustrating a schematic configuration of a printing apparatus according to an embodiment. The side view which shows schematic structure of the 2nd support part of the said printing apparatus, and a heating apparatus. FIG. 3 is a cross-sectional view taken along line 3-3 in FIG. 2. Sectional drawing of the 2nd support part and heating apparatus which show the effect | action of the said printing apparatus.

  Hereinafter, an embodiment of a printing apparatus will be described with reference to the drawings. Note that the printing apparatus of the present embodiment is an inkjet printer that ejects ink onto a medium such as paper to form characters and images.

  As illustrated in FIG. 1, the printing apparatus 10 performs printing on the medium M, a feeding unit 20 that feeds the medium M, a first support unit 30 that supports the medium M, a transport unit 40 that transports the medium M, and the medium M. The printing unit 50 includes a second support unit 60 as an example of a support unit that supports the printed medium M, and a heating device 70 that heats the medium M. In addition, the printing apparatus 10 includes a housing 11 that houses the components of the printing apparatus 10 and support legs 12 that support the housing 11.

  In the following description, the longitudinal direction of the printing apparatus 10 is “width direction X”, the direction in which the medium M is conveyed is “conveyance direction Y”, and the height direction of the printing apparatus 10 is “vertical direction Z”. To do. In the present embodiment, the width direction X is a direction (a direction orthogonal) different from both the transport direction Y and the vertical direction Z.

  As illustrated in FIG. 1, the feeding unit 20 includes a holding unit 21 that rotatably holds the roll body R around which the medium M is wound. The holding unit 21 holds a roll body R on which different types of media M are wound, or a roll body R on which mediums M having different dimensions in the width direction X are wound. The feeding unit 20 rotates the roll body R in one direction (counterclockwise in FIG. 1) and feeds the medium M unwound from the roll body R toward the first support unit 30.

  The first support unit 30 includes a first support base 31 and a second support base 32 that constitute a conveyance path of the medium M. The first support base 31 is provided upstream of the transport unit 40 in the transport direction Y, and the second support base 32 is provided downstream of the transport unit 40 in the transport direction Y. The first support table 31 guides the medium M fed from the feeding unit 20 toward the second support table 32. The second support base 32 guides (supports) the medium M on which printing is performed. In the present embodiment, the medium M in a state in which one end (the right end in FIG. 2) of the medium M is aligned with one side (the right side in FIG. 2) of the first support part 30 and the second support part 60 in the width direction X. Is transported.

  The transport unit 40 includes a drive roller 41 disposed below the transport path of the medium M, a driven roller 42 disposed above the transport path of the medium M, and a transport motor 43 that drives the drive roller 41. ing. The driving roller 41 and the driven roller 42 are rollers that rotate with the width direction X as the rotation axis direction. The transport unit 40 drives the transport motor 43 with the medium M sandwiched between the driving roller 41 and the driven roller 42, and transports the medium M fed from the feeding unit 20 in the transport direction Y.

  The printing unit 50 includes a guide shaft 51 extending in the width direction X, a carriage 52 supported by the guide shaft 51, a discharge unit 53 that discharges ink onto the medium M, and a moving mechanism that reciprocates the carriage 52 in the width direction X. 54.

  The discharge part 53 is an inkjet head in which a plurality of nozzles are formed. The discharge unit 53 is supported by the carriage 52 so as to face the second support base 32. The moving mechanism 54 may be configured to include, for example, a motor and a transmission mechanism that converts the rotational motion of the motor into the reciprocating motion of the carriage 52.

  The printing unit 50 ejects ink from the ejection unit 53 while moving the carriage 52 in the width direction X by driving the moving mechanism 54. In this way, the printing unit 50 prints characters and images for one pass on the medium M transported by the transport unit 40.

  As shown in FIGS. 2 and 3, the second support portion 60 includes a base frame 61 whose longitudinal direction is the width direction X, side frames 62 disposed on both outer sides in the longitudinal direction of the base frame 61, And a guide plate 63 disposed above the frame 62.

  The base frame 61 is a frame that forms the bottom of the second support portion 60. The base frame 61 has a plate shape whose longitudinal direction is the width direction X, and is thicker than the side frame 62 and the guide plate 63. The base frame 61 is connected to the support legs 12, for example.

  The side frame 62 has a plate shape. The side frames 62 are provided so as to form a pair on both sides in the width direction X of the base frame 61. The side frame 62 is connected to the base frame 61 so as to extend vertically upward from both ends in the width direction X of the base frame 61. What is necessary is just to connect the side frame 62 and the base frame 61 with fastening members, such as a screw or a rivet, for example.

  The guide plate 63 has a plate shape in which the width direction X is the longitudinal direction and the transport direction Y is the short direction. The guide plate 63 is connected to the side frame 62 so as to bridge the pair of side frames 62 in the width direction X. What is necessary is just to connect the guide plate 63 and the side frame 62 with fastening members, such as a screw or a rivet, for example.

  In the following description, the surface constituting the conveyance path of the medium M in the guide plate 63 is referred to as “support surface 64”. As shown in FIG. 3, the central portion of the support surface 64 in the width direction X is the first support surface 641, and the outer portion of the support surface 64 in the width direction X is the second support surface than the first support surface 641. 642.

  The length of the second support surface 642 in the width direction X may be shorter than the length of the first support surface 641 in the width direction X. However, as shown in FIG. 3, the second support surface 642 is larger than the region exposed without being hidden by the medium Mmax when the medium Mmax having the maximum width that can be printed by the printing apparatus 10 is placed on the support surface 64. Is preferably a wide area. In other words, when the medium Mmax having the maximum width is placed on the support surface 64, the surface including the surface that does not support the medium Mmax becomes the second support surface 642. The maximum width medium Mmax mentioned here is the medium M having the maximum length in the width direction X among the mediums M that can be printed by the printing apparatus 10.

  In this embodiment, the material of the guide plate 63 is aluminum, and at least the second support surface 642 of the first support surface 641 and the second support surface 642 is anodized. Thus, the second support surface 642 has higher infrared absorptivity (emissivity) and lower infrared reflectivity than the first support surface 641. As an example, it is preferable that the second support surface 642 has an absorptivity of infrared light having a wavelength of 8 μm to 10 μm of 0.8 or more. The infrared absorptance can be measured by FTIR (Fourier Transform Infrared Spectroscopy).

  In the following description, “infrared absorptivity and infrared reflectance” are also simply referred to as “absorptivity and reflectance”. In this embodiment, since the guide plate 63 is a metal plate having a thickness, it is assumed that the infrared transmittance of the support surface 64 is “0 (zero)”.

  As shown in FIGS. 2 and 3, the heating device 70 is disposed in a region facing the support surface 64 of the second support portion 60. The heating device 70 is supported by, for example, the casing 11 of the printing device 10 or the side frame 62 of the second support unit 60. The heating device 70 includes a lower cover 71 that extends in the width direction X of the second support portion 60, an upper cover 72 that covers the lower cover 71, and a side that covers the lower cover 71 and the upper cover 72 from both sides in the width direction X. And a cover 73. The lower cover 71 has a bracket 74 that supports a heating element 81 described later.

  The length of the lower cover 71 and the upper cover 72 in the width direction X is slightly longer than the length of the second support portion 60 in the width direction X. For this reason, the side cover 73 that covers the lower cover 71 and the upper cover 72 from both sides is disposed on both sides of the second support portion 60 (support surface 64) in the width direction X.

  A first space 75 is formed between the lower cover 71, the upper cover 72, and the side cover 73, and a second space 76 is formed between the lower cover 71 and the side cover 73. The first space 75 is a space formed above the lower cover 71, and the second space 76 is a space formed below the lower cover 71.

  The first space 75 includes an upstream opening 77 that opens upstream in the transport direction Y of the second support portion 60 and a downstream opening 78 that opens downstream in the transport direction Y of the second support portion 60. Through the open air. The upstream opening 77 and the downstream opening 78 are formed across the width direction X. The second space 76 faces the second support portion 60 between the upstream opening 77 and the downstream opening 78 in the transport direction Y.

  In the lower cover 71, the surface facing the support surface 64 of the second support portion 60 is a reflection surface that reflects infrared rays (hereinafter also referred to as “rear reflection surface 711”). In the side cover 73, the surface surrounding the second space 76 is a reflection surface that reflects infrared rays (hereinafter also referred to as “side reflection surface 731”). When the material of the lower cover 71 and the side cover 73 is made of metal, the inner side surface of each of the lower cover 71 and the side cover 73 may be made a reflective surface by finishing it into a mirror surface. As an example, it is preferable that the reflectance of the rear reflective surface 711 and the side reflective surface 731 is 0.8 or more. Further, the rear reflecting surface 711 and the side reflecting surface 731 have a higher reflectance and a lower absorptance than the first supporting surface 641 and the second supporting surface 642. On the other hand, the rear reflection surface 711 and the side reflection surface 731 have a transmittance of “0 (zero)”, similarly to the first support surface 641 and the second support surface 642. In the present embodiment, the side cover 73 corresponds to an example of a “side reflector”.

As shown in FIG. 2, the heating device 70 includes a heating element 81 whose longitudinal direction is the width direction X, a tube 82 into which the heating element 81 is inserted, and a fan 83 that blows gas.
The heating element 81 and the tube 82 are supported by the bracket 74 of the lower cover 71 so as to face the support surface 64 of the second support portion 60. The heating element 81 and the tube 82 are provided across the width direction X of the support surface 64. The heating element 81 may be configured to generate heat when energized, such as a heating wire. The tube 82 preferably has high thermal conductivity and high surface emissivity.

  A plurality of fans 83 are arranged in the second space 76 so as to be aligned in the width direction X. The fan 83 blows the gas taken in from the downstream side opening 78 toward the upstream side opening 77 as indicated by white arrows in FIG. The fan 83 corresponds to an example of “an airflow generation unit”.

  In the heating device 70, a heating element 81 that generates heat when energized heats the tube 82. Then, the tube 82 irradiates infrared rays corresponding to the temperature toward the support surface 64 of the second support portion 60 and the medium M supported by the support surface 64. Then, the temperature of the medium M supported on the support surface 64 rises, and the solvent component of the ink ejected on the medium M evaporates. Thus, the heating device 70 heats the second support part 60 and the medium M supported by the second support part 60 in a non-contact manner in the width direction X. Further, in the heating device 70, the fan 83 is driven while the heating element 81 is energized. Then, an air flow from the downstream opening 78 toward the upstream opening 77 is generated in the first space 75. Thereby, in the heating area | region 84 between the 2nd support part 60 (support surface 64) and the heating apparatus 70, the high temperature airflow which goes to a conveyance direction downstream generate | occur | produces. As a result, evaporation of the solvent component of the ink discharged onto the medium M is promoted.

  Note that the heating device 70 has a speed difference between the airflow generated in the region facing the first support surface 641 and the airflow generated in the region facing the second support surface 642 in the heating region 84. Preferably configured to occur. For example, the heating device 70 may increase the output or decrease the output according to the distance from the center in the width direction X among the plurality of fans 83 to cause a speed difference in the airflow. Good. As an example, by increasing the output of the fan 83 arranged near the center in the width direction X, while reducing the output of the fan 83 arranged outside in the width direction X, a speed difference can be caused in the airflow. That's fine.

Next, the operation of the printing apparatus 10 of this embodiment will be described.
When printing on the medium M in the printing apparatus 10, the medium M before printing fed out from the feeding unit 20 is transported to the first support unit 30 by the transport unit 40. Subsequently, ink is ejected from the printing unit 50 toward the medium M supported by the first support unit 30, and characters and images are printed on the medium M. Thereafter, the printed medium M is transported to the second support unit 60 by the transport unit 40 and heated by radiating infrared rays from the heating device 70. In this way, the solvent component of the ink discharged onto the medium M evaporates, and the characters and images printed on the medium M are fixed on the medium M.

  Here, in the second support portion 60 heated by the heating device 70, when both ends in the width direction X are connected to the side frame 62, the base frame is transmitted from the second support portion 60 through the side frame 62. Heat easily moves to 61. In addition, when both ends in the width direction X of the second support portion 60 are in contact with the outside air in the installation environment of the printing apparatus 10, heat easily moves from the both ends in the width direction X to the outside air. As a result, the temperature at both end portions in the width direction X of the second support portion 60 may be likely to be lower than the temperature at the center portion in the width direction X of the medium M.

  In this regard, as shown in FIG. 3, in the present embodiment, when heating the medium M (Mmax), the heating device 70 emits infrared rays toward the support surface 64 and the medium M supported by the support surface 64. . Of the infrared rays radiated from the heating device 70, the infrared rays going to the opposite side of the second support portion 60 are supported on the support surface 64 and the support surface 64 by the rear reflecting surface 711 of the lower cover 71 of the heating device 70. Is reflected toward the medium M (Mmax). Of the infrared rays radiated from the heating device 70, the infrared rays going to the outside of the support surface 64 are reflected toward the second support surface 642 by the side reflection surface 731 of the side cover 73 of the heating device 70. .

  As a result, the amount of infrared absorption at both ends in the width direction X of the second support portion 60 increases, and the temperature at both ends in the width direction X of the second support portion 60 is less likely to decrease. Since the second support surface 642 is anodized, the temperature at both ends in the width direction X of the second support portion 60 is less likely to decrease.

  On the other hand, the heating device 70 drives the fan 83 to generate an airflow in the heating region 84 from upstream to downstream in the transport direction Y. In the present embodiment, a speed is generated between the airflow generated in the region facing the first support surface 641 and the airflow generated in the region facing the second support surface 642. For this reason, a pressure difference arises between the area | region facing the 1st support surface 641, and the area | region facing the 2nd support surface 642, and it becomes easy to mix the gas of both area | regions. Thus, temperature variations in the width direction X of the heating region 84 are suppressed. As a result, the temperature distribution in the width direction X is made uniform in the second support unit 60 facing the heating region 84 and the medium M supported by the second support unit 60.

  In addition, as shown in FIG. 4, when printing on a medium M having a relatively short length in the width direction X, similarly to the case of printing on a medium M (Mmax) having a long length in the width direction X. The temperature distribution in the width direction X of the medium M is made uniform. That is, as described above, the second support surface 642 absorbs infrared rays, so that the temperature at the first end (the right end in FIG. 4) in the width direction X of the second support portion 60 is unlikely to decrease. On the other hand, once the central portion in the width direction X of the second support portion 60 is heated, it is difficult for heat to move to the outside, and the temperature is unlikely to decrease. Thus, even when printing on the medium M having a relatively short length in the width direction X, the temperature distribution in the width direction X of the medium M is made uniform.

  In this way, the heating device 70 can heat the medium M having different lengths in the width direction X supported by the second support portion 60 substantially uniformly in the width direction X. As a result, in the medium M, the portion supported by the first support surface 641 is prevented from drying earlier than the portion supported by the second support surface 642, and color unevenness of the printed image occurs. Or wrinkles in the medium M are suppressed.

According to the embodiment described above, the following effects can be obtained.
(1) Since the absorption rate of the second support surface 642 constituting the outer portion in the width direction X on the support surface 64 is made higher than the absorption rate of the side reflection surface 731, the second support surface 642 absorbs infrared rays. It becomes easy to do. For this reason, the infrared absorption amount of the both ends in the width direction X of the 2nd support part 60 increases, and the temperature of the both ends in the width direction X of the 2nd support part 60 becomes difficult to fall. Therefore, it is possible to suppress the temperature distribution in the width direction X of the second support part 60 and the medium M supported by the second support part 60 from becoming uneven.

  (2) Since the first support surface 641 has a lower absorptance than the second support surface 642, processing for making the absorptivity of the first support surface 641 equal to or greater than the absorptivity of the second support surface 642. Need not be the first support surface 641. On the other hand, the center portion in the width direction X of the second support portion 60 having the first support surface 641 is more than both end portions in the width direction X of the second support portion 60 having the second support surface 642. The temperature is unlikely to decrease because heat hardly moves outside. For this reason, it can suppress that the temperature distribution in the width direction X of the medium M which the 2nd support part 60 and the 2nd support part 60 support with a simpler structure becomes non-uniform | heterogenous.

  (3) The second support portion 60 is made of aluminum, and the second support surface 642 is anodized. For this reason, the printing apparatus 10 can easily realize a configuration in which the absorption rate of the second support surface 642 is increased.

  (4) Since the heating device 70 blows air to the heating region 84, it is possible to suppress the temperature in the heating region 84 from becoming uneven. As a result, the printing apparatus 10 can suppress the temperature distribution in the width direction X of the medium M supported by the second support unit 60 and the second support unit 60 from becoming uneven.

  (5) Since the gas in the region facing the first support surface 641 and the gas in the region facing the second support surface 642 are easily mixed, the temperature difference between these regions is reduced. Thus, the printing apparatus 10 can suppress the temperature distribution in the width direction X of the medium M supported by the second support unit 60 and the second support unit 60 from becoming uneven.

  (6) The second support surface 642 is a region wider than the region exposed without being hidden by the medium Mmax when the medium Mmax having the maximum width is placed on the support surface 64. For this reason, even when the medium M is skewed during conveyance of the medium M, it is possible to suppress a decrease in the amount of infrared absorption in the outer portion of the support surface 64 in the width direction X.

In addition, you may change the said embodiment as shown below.
-The 2nd support part 60 may have a radiation fin in the center part in the width direction X in the back side of the guide plate 63. As shown in FIG. According to this, the temperature of the center part in the width direction X of the second support part 60 is likely to decrease. Thereby, the printing apparatus 10 can reduce the temperature difference between the center portion and both end portions in the width direction X of the second support portion 60.

  The absorption rate of the second support surface 642 of the second support unit 60 is preferably equal to or higher than the absorption rate of the printing surface of the medium M. According to this, the 2nd support surface 642 becomes easy to absorb infrared rays, and the temperature fall of the both ends in the width direction X of the 2nd support part 60 can be suppressed more.

-The 2nd support surface 642 of the 2nd support part 60 is good also as an infrared rays absorption surface by coloring with the color which is easy to absorb infrared rays.
-Both the 1st support surface 641 and the 2nd support surface 642 of the 2nd support part 60 may perform alumite processing, and do not need to perform alumite processing together.

The heating device 70 may include a plurality of heating elements 81 and tubes 82 in the transport direction Y.
The heating device 70 may include a plurality of heating elements 81 in the width direction X. In this case, the output of the heating element 81 arranged on the outer side in the width direction X may be higher than the output of the heating element 81 arranged on the near side in the width direction X. According to this, it can further suppress that the temperature distribution of the medium M in the width direction X becomes nonuniform.

  The heating device 70 opens the upstream opening 77 on one surface of the first support surface 641 and the second support surface 642, and a region facing the first support surface 641 and the second support surface 642. A velocity difference may be provided in the airflow generated in the region facing the. In addition, the heating device 70 opens the downstream opening 78 on one surface of the first support surface 641 and the second support surface 642, and a region facing the first support surface 641 and the second support surface. A speed difference may be provided in the airflow generated in the region facing 642.

The heating device 70 may not have a configuration for generating an air flow in the heating region 84.
The printing apparatus 10 may be transported in a state where the center of the medium M is aligned with the centers of the first support part 30 and the second support part 60 in the width direction X.

The fan 83 may be a suction pump such as a tube pump or a diaphragm pump. In this case, the suction pump corresponds to an example of an “airflow generation unit”.
The ink ejected by the ejection unit 53 of the printing apparatus 10 may be a thermosetting ink.

  -The printing apparatus 10 may not be an inkjet printer. For example, the printing apparatus 10 may be a non-impact printer such as a laser printer, an LED printer, or a thermal transfer printer, or an impact printer such as a dot impact printer.

  The medium M to be printed by the printing apparatus 10 may be a resin film or a fabric in addition to paper.

  DESCRIPTION OF SYMBOLS 10 ... Printing apparatus, 11 ... Housing | casing, 12 ... Support leg, 20 ... Feeding part, 21 ... Holding part, 30 ... 1st support part, 31 ... 1st support stand, 32 ... 2nd support stand, 40 DESCRIPTION OF SYMBOLS ... Conveyance part, 41 ... Driving roller, 42 ... Driven roller, 43 ... Conveyance motor, 50 ... Printing part, 51 ... Guide shaft, 52 ... Carriage, 53 ... Discharge part, 54 ... Moving mechanism, 60 ... Second support part , 61 ... base frame, 62 ... side frame, 63 ... guide plate, 64 ... support surface, 641 ... first support surface, 642 ... second support surface, 70 ... heating device, 71 ... lower cover, 711 ... rear Reflective surface, 72 ... upper cover, 73 ... side cover (an example of a side reflector), 731 ... side reflective surface, 74 ... bracket, 75 ... first space, 76 ... second space, 77 ... upstream side Opening 78, downstream opening 81, heating element 82, pipe 8 ... Fan (an example of the airflow generating portion), 84 ... heating area, M ... medium, Mmax ... medium, R ... roll body, X ... width direction, Y ... conveying direction, Z ... vertical direction.

Claims (5)

A support portion having a support surface for supporting the medium;
A heating device for irradiating the support surface with infrared rays across the width direction;
A side reflection plate provided on both sides of the support surface in the width direction and having a side reflection surface that reflects infrared rays toward the width direction outside of the support surface;
In the support surface, when the central portion in the width direction is a first support surface, and the outer portion in the width direction is a second support surface than the first support surface,
The printing apparatus, wherein the second support surface has a higher absorption rate than the side reflection surface. The printing apparatus according to claim 1, wherein the first support surface has an absorptance lower than that of the second support surface. The printing apparatus according to claim 1, wherein the support portion is made of aluminum, and the second support surface is anodized. The printing apparatus according to claim 1, further comprising an airflow generation unit that generates an airflow in a heating region between the heating device and the support unit. In the heating region, the air flow is generated such that a speed difference is generated between the air flow generated in the region facing the first support surface and the air flow generated in the region facing the second support surface. The printing apparatus according to claim 4, wherein the printing unit is driven.