JP5825907B2 - Inkjet recording device - Google Patents

Description

  The present invention relates to an ink jet recording apparatus, and more particularly to an ink jet recording apparatus that dries and fixes ink on a recording medium with a heating unit.

  A platen used in a recording apparatus may be divided into a plurality of platens (see, for example, Patent Document 1). In order to maintain the same distance from the ejection surface of the recording head to the support surface for supporting the recording medium of the platen, it is easier to divide the platen into a plurality of parts than to configure the platen with a single member. Further, in a recording apparatus that performs recording on a large recording medium, it is more advantageous in terms of cost to prepare a plurality of small platens than to prepare a large platen.

When such a divided platen is used in an ink jet recording apparatus that dries and fixes ink on a recording medium with a heating unit, a gap may be provided between the adjacent platens so that they do not contact each other. This is to prevent interference between adjacent members by causing the platen to thermally expand due to a temperature rise by the heating unit. That is, if members with different coefficients of thermal expansion such as the platen, the platen base that supports the platen, and the housing of the recording apparatus are fixed, distortion due to the difference in elongation may occur in each member, causing troubles such as deformation . This is to prevent this .

JP 2003-182168 A

  By the way, in general, in the scanning direction of the platen, the amount of heat due to heating from the heating unit differs, and as a result, the temperature may differ depending on the region in the scanning direction of the platen.

  For example, the amount of heat that the platen located at the end receives by the heating unit is less than the amount of heat that the platen located at the center receives, and the temperature does not rise compared to the platen located at the center.

  Further, when there are an area covered with the recording medium and an area not covered with the area in the scanning direction of the platen, the area covered with the recording medium of the platen is not directly heated from the heating unit. However, the area of the platen that is not covered with the recording medium is heated directly from the heating unit, and the temperature may rise from the set temperature.

  In such a case, if adjacent platens are arranged with a gap between them, a temperature difference occurs between the platens, and a discontinuous temperature difference occurs. As a result, a temperature gradient is generated in the region extending over the two platens of the recording medium, resulting in uneven drying. Then, unevenness of density is caused by the unevenness of drying, and the quality of the image is deteriorated.

The present invention is, more is the one which has been done in view of the platen adjacent their respective even when using a plurality of platens arranged by providing between gap between so as not to abut, An inkjet recording apparatus that does not cause a discontinuous temperature difference between platens is provided.

Therefore, in the present invention, an inkjet recording apparatus that performs recording on a recording medium conveyed using a recording head that ejects ink, the heating unit that heats the surface of the recording medium to which ink is applied, and the heating unit and a platen for supporting a recording medium to be heated by the platen is divided into a plurality, with which gap is provided between the platen adjacent ones of the divided platens, the adjacent platen to each other A heat conduction member is provided for transferring heat by connecting the heat conduction members, and the heat conduction member is deformed in accordance with a dimensional change of the gap due to heating by the heating unit .

  According to the above configuration, the heat of the platen having a high temperature is transmitted to the platen having a low temperature by the thermal connecting means, and the temperature between the platens becomes a substantially constant temperature. Thereby, uneven drying of the recording medium is reduced. As a result, density unevenness is reduced and recording quality is improved.

It is sectional drawing which shows the structure of the inkjet recording device of 1st Embodiment. It is the schematic which shows the principal part of the recording part of 1st Embodiment. It is explanatory drawing explaining the heat balance in a recording part. It is explanatory drawing which shows the relationship between the temperature distribution of 1st Embodiment, and a recording nonuniformity. It is explanatory drawing explaining the difference of the calorie | heat amount which a platen receives from a heater. It is a perspective view which shows the platen and downstream platen of 1st Embodiment. It is a perspective view which shows the platen and connection block of 2nd Embodiment. It is a perspective view which shows the Latin and connection sheet of 3rd Embodiment.

Embodiments of the present invention will be described below in detail with reference to the drawings.
(First embodiment)
FIG. 1 is a cross-sectional view showing the configuration of the ink jet recording apparatus of this embodiment. The recording apparatus of the present embodiment is a recording apparatus that performs recording on a large recording medium. Fig.1 (a) has shown the state at the time of normal use, and FIG.1 (b) has shown the state when opening and closing a heating part.

  The recording apparatus main body 1 of the present embodiment is opposed to the recording unit that performs recording on the recording medium P that is conveyed along the conveying path, and the recording surface of the recording medium P. A heating unit is provided for drying the discharged ink and fixing the ink. Further, the recording apparatus main body 1 of the present embodiment includes a recording medium supply unit 2 on which unused roll paper on which the recording medium is wound in a web shape is mounted.

  The recording medium P drawn out from the recording medium supply unit 2 is sandwiched by a pair of conveyance rollers including a conveyance roller 3 to which a rotational driving force is applied and a pinch roller 4 that is driven to rotate. The conveying roller 3 and the pinch roller 4 are divided into a plurality or formed as a single body over a length corresponding to the maximum recording medium width assumed to be used.

The recording medium P is transported by the rotation of the transport roller 3 and moves in the sub-scanning direction. Then, the recording medium P passes through the recording unit. The recording unit includes a carriage 5 that holds the inkjet recording head 10 and reciprocates in the main scanning direction, and a platen 11 that supports and guides the recording medium P at a recording position in a conveyance path through which the recording medium is conveyed. The platen 11 is held via a platen base 13 with respect to the metal casing of the apparatus main body 1. The platen 11 is thus configured to a plurality of platens 11a~11d divided in the longitudinal direction (main scanning direction) as described later. Among the platens 11a to 11d, at least adjacent platens are thermally connected by a thermal connection means described later.

  Further, the recording apparatus 1 of the present embodiment is provided with a rotary encoder that detects the rotation of the transport roller 3. Further, a linear encoder for detecting the position of the carriage 5 that reciprocates is provided.

The ink jet recording head of this embodiment uses a method using a heater, but the present invention is not limited to the method using a heater, and a method using a piezo element, a method using an electrostatic element, and a MEMS element. Any of these methods may be used. In this embodiment, emulsion ink (dispersion ink) is used. By applying heat to the ink droplets of the emulsion ink applied on the recording medium, a film is formed on the ink droplets, and the ink is cured and fixed on the surface of the recording medium. For this purpose, the recording apparatus is provided with a heating unit 8 for heating the recording medium P on which ink has been ejected.

  A downstream platen 12 that guides the lower surface of the continuous recording medium P and a discharge roller 9 for discharging the recording medium P further downstream are provided downstream of the recording unit. The recording medium P on which recording has been performed is discharged out of the apparatus main body 1 from the left direction in the drawing and falls downward (gravity direction). In the direction in which the recording medium P is transported during recording along the transport path, the recording medium supply unit 2 side is the upstream side, and the recorded recording medium discharge side is the downstream side.

  Above the recording unit, a heating unit 8 is provided as a fixing device that heats the recording medium P on the platen to dry and fix the ink image. The heating unit 8 is moved on a predetermined path related to the rotation of the first unit 6 and the first unit 6 supported by the rotation shaft 63 on the apparatus main body 1 so as to be rotatable with respect to the apparatus main body 1. And a second unit 7. As shown in FIG. 1A, the heating unit 8 is closed with respect to the apparatus main body 1 as shown in FIG. 1A and to the apparatus main body 1 for jam processing and various maintenance as shown in FIG. It is possible to move between the opened second state. When the heating unit 8 is opened and closed with respect to the apparatus body 1, the second unit 7 moves along a predetermined locus as the first unit 6 rotates. The heating unit 8 is configured to stably stop in the first state and the second state.

  The first unit 6 includes a heater 61 and a reflector 62 that deflects the heat radiation direction of the heater 61 substantially in the direction of the recording medium P. Similar to the first unit 6, the second unit 7 includes a heater 71 and a reflector 72 that deflects the heat radiation direction of the heater 71 in the direction of the recording medium P. The heaters 61 and 62 are heat sources such as rod-shaped halogen heaters or sheathed heaters connected to a power source that is an energy source. The reflectors 62 and 72 are reflecting mirrors that deflect the heat rays generated from the heater in approximately one direction. Ideally, the reflectors 62 and 72 have a parabolic cross section with the heater as a focal point, and the heater side surface is ideally formed as a mirror surface. However, if the heat rays can be deflected substantially in the direction of the recording medium, the parabolic cross section is obtained. It is not limited. The reflecting mirror is made of a material that can withstand high temperatures, and for example, a metal such as stainless steel or aluminum is preferable. The first unit 6 is disposed above the reciprocal movement locus of the ink jet recording head 10 and heats the recording surface (ink application surface) side of the recording medium P at the recording position with heat rays. The second unit 7 is disposed immediately above the recording medium P at a position downstream of the recording position, and similarly heats the recording surface (ink application surface) side of the recording medium P. The second unit 7 is for completely drying the ink on the recording medium that could not be completely dried by the first unit 6. When an emulsion ink that is cured by heating is used, it is heated to its curing temperature. Thus, the heating unit 8 heats the recording medium P after ink application in the first state to dry and fix it.

  The recording sequence in the above configuration forms a two-dimensional ink image on the recording medium P serially by alternately repeating reciprocating movement (main scanning) and recording medium conveyance (sub-scanning) of the inkjet recording head 10. Based on serial recording. In the main scanning in serial recording, a so-called multi-pass recording method is adopted in which the carriage 5 is reciprocally moved and ink is applied to the same portion of the recording medium a plurality of times to complete the image. When emulsion ink is used, the portion where ink is applied from the inkjet recording head 10 in a certain main scan (pass) is not changed until the ink is applied to the same portion in the next main scan (pass). It must be dry to the extent that droplet aggregation does not occur. Insufficient drying may cause overprinted ink to mix and cause image degradation due to bleeding or aggregation. In addition, a difference in drying condition during recording (drying unevenness) may affect the image.

Therefore, the heating unit 8 heats the recording medium surface by irradiating the recording medium P with heat rays even while the carriage 5 reciprocates during the recording operation. In the area not blocked by the carriage 5, the heat rays from the first unit 6 are irradiated on the ink application surface of the recording medium P. The heat rays do not reach the shaded part of the moving carriage 5. However, since the carriage 5 moves at a substantially constant speed, the accumulation of the heat ray irradiation on the area to which the ink of the recording medium P is applied in the main scanning direction is averaged, and a substantially uniform heating amount is given in the main scanning direction. The effect on image quality is negligible.

  The recording medium P is heated to a predetermined temperature (for example, 80 ° C.) by the first unit 6. For this purpose, the temperature of the recording medium P at the recording position where the first unit 6 is irradiated with heat rays is detected by a first temperature sensor (not shown), and the heater 61 is controlled so that the detected temperature becomes a predetermined temperature. . Similarly, the recording medium P is heated to a predetermined temperature (for example, 90 ° C.) by the second unit 7. For this purpose, a temperature at a position downstream of the recording position where the second unit 7 is irradiated with heat rays is detected by a second temperature sensor (not shown), and the heater 71 is controlled so that the detected temperature becomes a predetermined temperature. The

  FIG. 2 is a schematic diagram showing the main part of the recording unit of the present embodiment. 2A shows the top surface of the recording unit, FIG. 2B shows the right side of the recording unit, and FIG. 2C shows the cross section of the recording unit.

The platen 11 of the present embodiment is configured by arranging a plurality of platens 11 a to 11 d in the reciprocating direction (sub-scanning direction) of the inkjet recording head 10. In order to maintain the same distance G from the ejection surface of the recording head to the support surface for supporting the recording medium of the platen, it is easier to divide the platen into a plurality of parts than to configure the platen with a single member. Further, in a recording apparatus for recording a large-sized recording medium, rather than providing a large platen, Ru advantageous der in cost is better to prepare a plurality of small platens.

  The distance G from each support surface of the platens 11a to 11d to the ink ejection surface of the recording head 10 is arranged with high accuracy so as to be within a predetermined range with respect to the set value. For example, when the distance G is set to 1 mm, the displacement is arranged in a range of ± 0.1 mm in the entire region in the main scanning direction. In order to maintain such a distance, an adjustment process may be required when manufacturing the recording medium. When such an adjustment is made, the platens 11a to 11d may have a configuration for position adjustment.

  In addition, a portion where each of the platens 11 a to 11 d is adjacent (hereinafter also referred to as “dividing portion”) is divided so as to be inclined at an inclination angle α with respect to the conveyance direction (sub-scanning direction) of the recording medium P. Yes. As will be described later, the platens 11a to 11d are provided with appropriate gaps M so that the platens do not come into contact with each other so that interference between adjacent members does not occur due to thermal expansion or displacement due to adjustment. When ink is applied to the recording medium covering the gap M, the ink droplets may be blurred. For example, when ink is ejected to the area of the recording medium that covers the gap M, the area becomes dull and sinks into the gap M, which may blur the ink dots. Further, when the area of the recording medium covering the gap M is heated by the heating unit, the recording medium is stretched, the area sinks into the gap M, and the ink dots may be blurred. Further, drying unevenness may occur due to a temperature difference of the platen caused by a platen divided portion (gap M) described later. The effect of the gap M on the image quality is mitigated by inclining the gap M on the platen at an inclination angle α, thereby reducing the manpower affecting the image.

In addition, although the platen of this embodiment is divided | segmented so that it may incline with the inclination | tilt angle (alpha), this invention is not limited to such a division | segmentation. That is, as long as it divides in a form drying unevenness does not occur in the recording medium due to arise a temperature difference in the division unit of the reduction and the platen guide precision due to the parallel dividing the conveying direction of the recording medium platen Good. For example, you may divide | segment so that it may arrange | position in substantially P shape or the shape which overlaps adjacent uneven | corrugated shape in a key shape or what is called a comb-tooth shape.

  Further, at least the surface side (recording medium support surface) of the platens 11a to 11d that contacts the recording medium P is made of a material having higher thermal conductivity than the platen (for example, a metal such as an aluminum alloy). Arranged thermally separated from the housing. Here, “thermally separating” does not mean the concept of physical complete insulation. For example, the heat on the side of the platen 11 is metal between a platen 11a to 11d having high thermal conductivity and a metal housing (for example, iron) constituting the apparatus body 1 via a member (for example, plastic) having low thermal conductivity. This means that it is difficult to conduct to the housing side.

  Specifically, in the present embodiment, the platen 11 made of aluminum alloy is held by an iron casing through a platen base 13 made of plastic (for example, modified PPE) having low thermal conductivity. Metals have high thermal conductivity, and resins have low thermal conductivity. For example, a metal aluminum alloy is about 230 W / (m · K), and a resin modified PPE (modified polyphenylene ether) is about 0.19 W / (m · K).

  The platens 11a to 11d are thermally expanded by the temperature rise by the heating unit 8. When members having different coefficients of thermal expansion such as an aluminum alloy platen 11, a plastic platen base 13, and an iron housing are fixed as in the present embodiment, distortion due to the difference in elongation occurs in each member and deformation, etc. Cause trouble. Therefore, in this embodiment, in consideration of the influence of thermal expansion in the main scanning direction, one end in the longitudinal direction is fixed and the other end has a so-called play in the main scanning direction (longitudinal direction). Further, an appropriate gap M is provided so that adjacent members do not interfere with each other due to thermal expansion or displacement due to adjustment. Further, the direction Z after adjusting the distances from the respective support surfaces of the platens 11a to 11d to the ink ejection surface of the recording head 10 is regulated.

  In the present embodiment, the print head direction of the platen 11 and the platen base 13 and the sub-scanning direction are so small that the expansion due to thermal expansion is negligibly small in terms of function. The structure which considered the influence of thermal expansion similarly to a direction may be sufficient. In addition, the configuration in consideration of the influence of displacement (dimensional change) due to thermal expansion is not limited to the above-described configuration, and may be a known configuration. In other words, any structure may be used as long as the thermally expanding member is stably held in a form suitable for the purpose and is not affected by displacement or deformation in terms of function.

  FIG. 3 is an explanatory diagram for explaining the heat balance in the recording unit. When the recording medium P is heated by the heat ray Q1 from the first unit 6, the platens 11a to 11d are simultaneously heated via the recording medium P because they are in contact with the recording medium P on the recording medium support surface. . Therefore, when the temperature of the recording medium P reaches a predetermined temperature (for example, 80 ° C.), the platens 11a to 11d also reach the same temperature. On the other hand, the recording medium portion having a low temperature (for example, 80 ° C. or less) immediately after the recording medium is newly fed out by the transport roller 3 is caused by the heat rays Q1 from the first unit 6 and the heat rays Q2 from the platens 11a to 11d. Both are heated. Thus, the platens 11a to 11d also have a function as a thermal buffer means.

  FIG. 4 is an explanatory diagram showing the relationship between the temperature distribution of the platen and the recording unevenness of the present embodiment. As described above, even if the recording medium is newly fed out to a part of the platen, it is heated by the heat rays from the first unit 6 and the heat rays from the platen. However, the amount of heat (heat balance) received by each of the platens 11a to 11d is not necessarily equal. Such a state will be described in the case where there is no thermal connection means for thermally connecting the platens 11 according to the present embodiment.

  4 (a) and 4 (b) are diagrams showing a case where there is no thermal connection means. For example, as shown in FIG. 4A, when a recording medium shorter than the full width of the platen 11 (configured by the platens 11a to 11d) is recorded, it corresponds to a partial area that is not covered (exposed) by the recording medium. The platen portions 11 c and 11 d are always exposed to heating by the first unit 6. In this region, since the recording medium P is not heated, a relatively large amount of heat is received. In such a case, a temperature gradient occurs in the end region of the recording medium covering the platen 11c.

  Alternatively, as shown in FIG. 4B, the platen portion corresponding to a portion where the amount of heat from the heater 61 decreases structurally, such as in the vicinity of both ends in the direction X of the first unit 6, receives relatively less heat. This situation is described in detail below.

  FIG. 5 is an explanatory diagram illustrating the difference in the amount of heat received by the platen from the heater. The heater 61 of the first unit 6 extends in the direction X corresponding to the recording area, of which the effective area to be irradiated with heat rays is the heat generating portion 61a. Since portions other than the heat generating portion 61a do not generate heat, heat rays are relatively reduced.

  When attention is paid to an arbitrary point c on the platen 11c and a point d at the left end of the platen 11d, the point c is heated from the entire region of the heat generating portion 61a as conceptually indicated by an arrow Wc. On the other hand, as conceptually indicated by the arrow Wd, the point d is heated only in the region on the right side of the left end portion of the heat generating portion 61a. Therefore, the amount of heat received at point d is relatively less than the amount of heat received by point c. As a result, a temperature gradient occurs at the end of the recording medium covering the platen 11d.

Thus, in each platen 11 a to 11 d, the respective heat balance is uneven, as shown in FIG. 4 (a), (b) , the platen 11 is discontinuous to the dividing portion and the boundary A temperature distribution occurs. Then, the temperature distribution is brought to the recording medium P. Here, the discontinuous temperature difference means an abrupt temperature distribution difference of the recording medium P with the vicinity of the dividing position of the platen 11 as a boundary. When the recording medium P has a discontinuous temperature distribution as described above, unevenness in drying of ink occurs, and a difference occurs in the ink drying state in the recording unit, resulting in unevenness in density. As a result, the image quality of the recorded image is degraded.

  FIG. 6 is a perspective view showing the platen and the downstream platen. In the present embodiment, the downstream platen 12 made of an aluminum alloy plate is held in a state of being thermally separated from the metal casing of the apparatus body 1 via the downstream platen base 14 in the same manner as the platen 11. Has been.

Downstream platen 12 in FIG. 6 (a), the interval portion of the elastic shaped portion 121 is a platen 11 which thermally connects the platen 11 adjacent to each other on the platen 11 side (in this embodiment, three) are formed . Further, in FIG. 6B, the elastic shape portion 121 has contact surfaces 121 </ b> R and 121 </ b> L of bent portions that can be elastically deformed with respect to the main body of the downstream platen 12, and correspondingly formed on the platen 11 side. It is in elastic contact with the contact surfaces 111R and 111L. In FIG. 6B, for the convenience of explanation, the downstream platen 12 and the platens 11a and 11b are illustrated as being separated from each other. However, in actuality, the above-described contact surfaces are in contact with each other. is there. Further, in FIG. 6B, the platens 11a and 11b are shown as partial cross sections along the virtual cutting line H as an example. The same applies to combinations between other platens. With the above-described configuration, the abutting state is maintained corresponding to displacement such as thermal expansion of each part and gap adjustment of 11 parts of the platen, and the adjacent platens are thermally connected.

In this embodiment, by connecting the platens 11 with the elastic shape portion 121, heat is transferred from a platen having a large amount of received heat to a platen having a small amount of received heat, and a discontinuous temperature at the boundary portion of the platen. Reduce the difference. Thereby, drying unevenness can be reduced, and as a result, density unevenness can be suppressed and image quality can be improved.

  FIG. 4C is a cross-sectional view showing the platens when the platens of the present embodiment are connected by means for thermally connecting the platens. When there is a means for thermally connecting the platens 11, heat is transferred from the platen 11c having a large amount of received heat to the platen 11d having a small amount of received heat through the thermal connecting means. As a result, the discontinuous temperature difference at the boundary between the platen 11c and the platen 11d is eliminated, and the temperature difference between the platens 11c and 11d is reduced to the extent that the unevenness of drying of the recording medium is reduced.

  As described above, the thermal connection means for thermally connecting at least the adjacent platens 11 to each other in response to the displacement of the platen 11 when adjusting the gap or the dimensional change of the member of the recording unit due to thermal expansion due to heating. Is provided. For this reason, unevenness in drying of the ink on the recording medium between the platens due to the discontinuous temperature distribution of the platen with the divided portion of the platen 11 as a boundary is reduced. As a result, density unevenness is suppressed. Thereby, the image quality of the recorded image can be improved.

  In this embodiment, the recording apparatus for recording on a large recording medium has been described. However, the recording apparatus of the present invention does not perform recording on a large recording medium, but records on a recording medium such as ordinary copy paper. It may be a recording device that performs the above.

  The recording medium of the present embodiment performs recording on a recording medium drawn from roll paper, but the present invention is not limited to such a recording medium. That is, the recording medium may be supplied one by one from the recording medium supply unit on which the recording media are stacked.

  Furthermore, in the present embodiment, ink containing a lot of emulsion components is used. However, the present invention is not limited to such ink, and any components of the ink may be used.

(Second Embodiment)
Although the thermal connection means described in the first embodiment uses an elastic shape portion, the thermal connection means of the present invention is not limited to such a configuration.

  FIG. 7 is a perspective view showing the platen and the connection block of the present embodiment. In the present embodiment, a description will be given by taking an example of a divided portion of the platen 11a and the platen 11b, but the same applies to other combinations of platens. Further, in the drawing, the platen is shown as a partial cross section along a virtual cutting line H for convenience of explanation.

  In the vicinity of the divided portion of the platen 11a and the platen 11b, a connection block 15 made of a material having high thermal conductivity is in contact with the contact surface 111R of the platen 11a and the contact surface 111L of the platen 11b. . The connection block 15 is, for example, an aluminum alloy block. The connection block 15 is urged toward the contact surfaces 111R and 111L by urging means (not shown) at the hole 151 and hole 152 portions. For this reason, the contact state is maintained corresponding to displacement such as thermal expansion and gap adjustment of the platen 11 portion, and the adjacent platens are thermally connected. Since the cross-sectional area can be increased by configuring the connection block 15 as the thermal connection means in this way, the thermal conductivity between the platen 11a and the platen 11b can be increased.

(Third embodiment)
Figure 8 is a perspective view showing the the platen of the present embodiment the connection sheet. In the present embodiment, a description will be given by taking an example of a divided portion of the platen 11a and the platen 11b, but the same applies to other combinations of platens. Further, in the drawing, the platen is shown as a partial cross section along a virtual cutting line H for convenience of explanation.

  In the vicinity of the divided portion of the platen 11a and the platen 11b, the connection sheet 16 made of an elastic body having high thermal conductivity corresponds to the contact surface 111R of the platen 11a and the contact surface 111L of the platen 11b. It is fixed at the contact surface. The material of the connection sheet 16 is, for example, a spring material such as stainless steel or an elastic member such as silicone rubber. Since the deforming portion 161 of the connection sheet 16 is elastically deformed in response to a displacement such as thermal expansion or gap adjustment of the 11 portion of the platen, the adjacent platens are thermally connected.

DESCRIPTION OF SYMBOLS 1 Apparatus main body 5 Carriage 10 Inkjet recording head 11, 11a, 11b, 11c, 11d Platen 12 Downstream platen 15 Connection block 16 Connection recording medium 61 Heater

Claims (5)

An ink jet recording apparatus that performs recording on a recording medium conveyed using a recording head that discharges ink,
A heating unit for heating the surface of the recording medium to which ink is applied;
A platen for supporting a recording medium heated by the heating unit ;
With
The platen is divided into a plurality, and a gap is provided between adjacent platens among the divided platens ,
An ink jet recording apparatus comprising: a heat conductive member that transfers heat by connecting the adjacent platens; and the heat conductive member is deformed in accordance with a dimensional change of the gap due to heating by the heating unit. . The inkjet recording apparatus according to claim 1 , wherein a gap between the adjacent platens is inclined with respect to a conveyance direction of the recording medium . Further comprising a downstream platen disposed downstream of the divided platen in the conveyance direction of the recording medium,
An ink jet recording apparatus according to claim 1 or 2, wherein the heat conducting member is characterized by being formed on the downstream platen. The plurality of platens are mounted on a platen base;
The inkjet recording apparatus according to claim 1, wherein the thermal conductivity of the thermal conductive member is higher than that of the platen base. 5. The inkjet recording apparatus according to claim 4, wherein each of the divided platens is fixed to the platen base at one end and placed on the platen base with play at the other end .

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