JP2013082098A - Recording device and method for controlling the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a recording device has crosstalk noise resistance by a simple structure when a heater for heating a recording medium is mounted to a carriage, and to provide a method for controlling the recording device.SOLUTION: Switching control for switching on and off the current of the heater and the transmission timing of a recording logic signal to a recording head are exclusively controlled. Additionally, the timing of the input of a temperature signal from a temperature sensor of the recording head and the switching control for switching on and off the current of the heater are exclusively controlled.

Description

  The present invention relates to a recording apparatus and a heater control method thereof, and more particularly, to a recording apparatus that mounts a heater on a carriage and fixes ink with the heater to record an image on a recording medium and a heater control method thereof.

  In recent years, a plurality of recording elements (heaters) provided in an ink jet recording head are heated on a recording medium such as recording paper to eject ink droplets, which are used as recording media to form an image. Ink-jet recording apparatuses are widely used.

  More recently, demand for large-format inkjet recording devices (hereinafter referred to as recording devices) targeting the sign & display industry, CAD industry, etc. has increased, and there are a variety of recording devices that have expanded print sizes and diversified ink colors. It has been demanded. In particular, recording apparatuses for the sign & display industry use ink that has good ink fixing properties and can be recorded on various recording media, considering that printed materials are used outdoors.

  For example, with solvent-based ink, the recording medium before recording is heated with a first heater to improve the permeation of the ink, or the ink adhering to the recording medium is heated with a second heater. Some ideas have been made to improve the fixing ability.

  In the UV-based ink, taking advantage of the property that the ink is cured by irradiating ultraviolet rays or applying heat, the recording medium before recording is heated by the first heater, and after the ink adheres to the recording medium, The ink is fixed by heating with the second heater.

  Further, recently, in order to quickly evaporate the moisture of the ink adhering to the recording medium, the recording medium is heated by the first heater, and after the ink has adhered, the moisture evaporates and then the internal components of the ink are solidified by the second heater. Recording apparatuses using water-based ink for fixing are also in widespread use.

  The inks described above are excellent in fixability and have the feature that printed matter can be used without problems even outdoors. However, as described above, the recording medium is often heated with a heater before and after recording. Heating by the heater is realized by, for example, a method of heating with a heater embedded in a platen or a method of mounting a plurality of heaters in the upper surface cover of the main body.

  However, the above method requires a heater over the entire recording area, and there is a problem that power consumption is large. In particular, the method of mounting a heater in the upper cover of the main body has a problem that the heating efficiency is poor because the distance from the heater to the recording medium is long.

  In order to solve these problems, conventionally, a method of heating a recording medium or ejected ink with low power consumption and high efficiency by mounting a small heater on a carriage unit on which a recording head is mounted is known ( For example, see Patent Document 1 and Patent Document 2).

JP 2006-272731 A Japanese Patent Laying-Open No. 2005-096373

  When the heater is mounted on the carriage unit as described above, the wiring (for example, FFC) and the heater between the first substrate that generates recording data and controls the entire recording apparatus and the second substrate connected to the recording head It is desirable that the wiring for driving has the same path.

  However, if such a configuration is adopted, a large current flows in the heater drive, while the print data only requires a logic signal of several volts, and therefore the legitimacy of the print data is impaired due to crosstalk noise accompanying the heater drive. May cause malfunction. On the other hand, if the heater drive wiring and the FFC are provided in different paths in order to avoid crosstalk noise, there is a problem that the configuration becomes complicated and the apparatus cost increases.

  The present invention has been made in view of the above-described conventional example, and an object thereof is to provide a recording apparatus that is resistant to crosstalk noise with a simple and inexpensive configuration and a heater control method thereof.

  In order to achieve the above object, the recording apparatus of the present invention has the following configuration.

  That is, a recording apparatus that performs recording by ejecting ink onto a recording medium from the ink jet recording head while reciprocating a carriage on which the ink jet recording head is mounted, the front of the carriage being in the forward direction of the reciprocating movement of the carriage When performing recording by moving the carriage in the forward direction, the first heater provided in the second heater, the second heater provided at the rear of the carriage with respect to the forward direction of the reciprocating movement of the carriage, The first heater heats the recording medium before discharging the ink by the ink jet recording head, and after the ink discharge, heats the recording medium recorded by discharging the ink by the second heater, When recording by moving the carriage in the backward direction opposite to the forward direction, The recording medium is heated by the second heater before the ink is ejected by the inkjet recording head, and the recording medium on which recording is performed by the ejection of the ink is heated by the first heater after the ink is ejected. The heating timing of the first heater and the second heater is controlled, and the timing of supplying the recording logic signal to the ink jet recording head and the timing of heating the first heater and the second heater are exclusive. And a control means for controlling it to be suitable.

  According to another invention, there is provided a heater control method for a recording apparatus for performing recording by ejecting ink onto a recording medium from the inkjet recording head while reciprocating a carriage on which the inkjet recording head is mounted. A first heater is provided in front of the carriage in the forward direction of the reciprocating movement, and a second heater is provided in the rear of the carriage in the forward direction of the carriage reciprocating movement. When recording is performed by moving the recording medium, the recording medium is heated by the first heater before the ink is ejected by the ink jet recording head, and after the ink is ejected, the recording is performed by ejecting the ink by the second heater. The first heater and the second heater are heated so as to heat the recording medium subjected to And when performing recording by moving the carriage in a return path direction opposite to the forward path direction, the recording medium is heated by the second heater before ink ejection by the inkjet recording head, A step of controlling heating of the first heater and the second heater so as to heat the recording medium on which recording has been performed by ejecting the ink by the first heater after ejection of the ink. In this step, the timing of supplying the recording logic signal to the inkjet recording head and the timing of heating the first heater and the second heater are controlled to be exclusive. A heater control method for a recording apparatus is provided.

  Therefore, according to the present invention, the heater current on / off switching timing and the recording logic signal transmission timing are exclusive, so that the crosstalk noise generated during the heater current switching control does not affect the recording logic signal. There is no effect. Thereby, it is possible to prevent the recording apparatus from malfunctioning. In addition, for example, there is no need for special noise countermeasures such as separating the FFC and the heater wiring from each other or providing an insulator, so that the cost of the apparatus can be reduced.

1 is a perspective view illustrating a schematic configuration of an ink jet recording apparatus that is a typical embodiment of the present invention. FIG. 4 is a block diagram illustrating a configuration of a carriage unit. It is the block diagram which showed the heater control structure of a carriage. FIG. 6 is a diagram illustrating a flow of signals supplied from a main board to a recording head via a carriage during a recording operation. 6 is a timing chart showing superposition of crosstalk noise on a recording logic signal associated with heater switching during a recording operation. It is a block diagram which shows the structure which prevents the superimposition of the crosstalk noise according to Example 1 of this invention. It is a block diagram which shows the electric current on / off control structure of the 1st heater and 2nd heater according to Example 1 of this invention. It is a timing chart which shows a mode that the recording logic signal and heater current on / off control according to Example 1 of this invention are generated synchronizing. It is the figure which showed on / off control of the heater current according to Example 2 of this invention, and exclusive control of head temperature signal input.

  Hereinafter, preferred embodiments of the present invention will be described more specifically and in detail with reference to the accompanying drawings. In addition, the same code | symbol is attached | subjected to the already demonstrated part and duplication description is abbreviate | omitted.

In this specification, “recording” (sometimes referred to as “printing”) is not limited to the case of forming significant information such as characters and graphics, but may be significant. It also represents the case where an image, a pattern, a pattern, etc. are widely formed on a recording medium, or the medium is processed, regardless of whether it is manifested so that humans can perceive it visually. .
“Recording media” is not only paper used in general recording equipment, but also a wide range of materials that can accept ink, such as vinyl, cloth, plastic film, metal plate, glass, ceramics, wood, leather, etc. Is also expressed.
Furthermore, “ink” (sometimes referred to as “liquid”) is to be interpreted widely, and is applied to a recording medium to form an image, a pattern, a pattern, or the like, Alternatively, it represents a liquid that can be subjected to ink processing.

  FIG. 1 is a perspective view showing a schematic configuration of an ink jet recording apparatus which is a typical embodiment of the present invention. This ink jet recording apparatus (hereinafter referred to as a recording apparatus) is a so-called large format printer capable of recording on a large size recording paper such as A0 or B0.

  A carriage unit (hereinafter referred to as a carriage) 101 shown in FIG. 1 has an ink jet recording head (hereinafter referred to as a recording head) 107 and a carriage substrate (not shown). The carriage 101 reciprocates in the direction of the arrow X shown in FIG. Fixed to the carriage 101 are an FFC (flexible flat cable) 103 from the main board 102 disposed on the back of the main body of the recording apparatus and a caterpillar 106 that supports the movable portion of the FFC 103. A first heater 110 is mounted on the left side in the X direction of the carriage 101 (front in the carriage forward direction), and the first heater driving wiring 111 is wired in the same path as the FFC 103. A second heater 112 is mounted on the right side in the X direction of the carriage 101 (backward in the carriage forward direction), and the second heater driving wiring 113 is wired to the FFC 103. The FFC 103 wired from the carriage 101, the first heater driving wiring 111, and the second heater driving wiring 113 are wired while being supported by the caterpillar 106. Then, the bent portion 105 provided on the main stay 109 is connected to the main board 102 and the heater switching board 114 on the back surface of the main body.

  Here, the main board 102 and the heater switching board 114 are configured as separate boards, but the heater switching board 114 may be built in the main board 102. Further, although the wiring from the carriage 101 is supported by the caterpillar 106, a configuration without the caterpillar 106 may be used as long as the wiring does not flutter. Further, each of the first heater 110 and the second heater 112 may be composed of a plurality of heaters.

  The position of the carriage 101 is controlled by a linear scale 108 and an encoder (not shown) mounted on the back surface of the carriage 101. Then, ink is ejected from the recording head 107 while reciprocating on the main shaft 104 in the X direction of FIG. 1 by a carriage motor (not shown), and recording is performed on the recording medium.

  Here, position control by the linear scale 108 and the encoder will be described.

  The linear scale 108 is provided with slits at regular intervals, and the encoder reads the slits as the carriage 101 moves, generates an encoder pulse signal, and transmits it to the main board 102. The main board 102 counts the transmitted encoder pulse signals, and counts up when moving in the main scanning direction from right to left (hereinafter referred to as the forward direction), and when moving from left to right (hereinafter referred to as the return direction). Counts down. Thus, the physical position of the carriage 101 is specified, and the position is electrically controlled.

  FIG. 2 is an enlarged view showing the internal configuration of the carriage 101. Next, the heater driving and the recording operation will be described with reference to FIG.

  As described above, the carriage 101 is mounted with the first heater 110 and the second heater 112 at both left and right ends. When recording is performed while the carriage 101 moves in the forward direction, the first heater 110 heats the recording medium before recording (before ink ejection). Recording is performed by discharging ink from the recording head 107 to the heated recording medium. The moisture of the ink adhering to the recording medium heated by this recording is quickly and naturally evaporated. Thereafter (after ink ejection), the second heater 112 heats the ink from which the water has evaporated to fix it on the recording medium and fix the recorded image.

  On the other hand, when recording is performed while the carriage 101 moves in the backward direction, the roles of the respective heaters are reversed as compared with the case of recording in the forward direction. That is, the second heater 112 heats the recording medium before recording (before ink discharge), and performs recording by discharging ink from the recording head 107 to the heated recording medium. The moisture of the ink adhering to the recording medium heated by this recording is quickly and naturally evaporated. Thereafter (after ink ejection), the first heater 110 heats the ink from which the water has evaporated, and fixes the recorded image on the recording medium.

  In addition, the carriage 101 includes two temperature sensors 201 and 202 for measuring the recording surface temperature of the recording medium. In order to determine whether or not the recording surface has a desired temperature based on the temperature information obtained by these two sensors, the obtained temperature information is fed back to heater control described later.

  The temperature sensors 201 and 202 are controlled by a carriage substrate (not shown) in the carriage 101, and measured values are transferred to the main substrate 102 via the FFC 103. The temperature sensors 201 and 202 may be of any type as long as they can measure the temperature on the recording medium in a non-contact manner. Here, in consideration of the high speed, the wide measurement range, the measurement in the current mode, etc., an infrared temperature sensor is used. Used.

  FIG. 3 is a diagram for explaining a current on / off control method for the first heater 110 and the second heater 112. Here, the heater current is turned on and off by solid state relays (SW) 301 and 302.

  The solid-state relays 301 and 302 are switches made of a semiconductor, and have no mechanical contact, and thus have a feature that there is no contact life in terms of structure. Here, the solid state relays 301 and 302 are used to frequently turn on and off the current of the first heater 110 and the second heater 112.

  There are no particular restrictions on the elements that control on / off of the current of the first heater 110 and the second heater 112, and mechanical relays may be used instead of the solid state relays 301 and 302.

  The control of the first heater 110 and the second heater 112 is supplied to the heater by a heater control circuit 305 provided on the heater switching substrate 114 so that the heater temperature or the surface temperature of the recording medium becomes constant. This is done by turning on and off the current. Specifically, first, temperature sensors 201 and 202 (first temperature sensor and second temperature) in the temperature comparison circuits 303 and 304 (first comparison means and second comparison means) in the main board 102, respectively. The temperature read by the sensor) is compared with the target temperature. Thereafter, the comparison result is sent to the heater control circuit 305 of the heater switching board 114, and the heater current is turned on if the temperature has not reached. If the temperature reaches a predetermined temperature, a control signal is transmitted to the solid state relays 301 and 302 so that the heater current is turned off. In this way, the current supplied to the heater is controlled, the solid state relays 301 and 302 are controlled to be turned on and off so as to maintain the target temperature, and the first heater 110 and the second heater 112 are controlled.

  Next, several embodiments of heater control using the recording apparatus and carriage configuration having the above-described configuration will be described.

  Each of the first heater 110 and the second heater 112 used in this embodiment is composed of a halogen heater having a steep rise in light amount. Assuming that the light quantity rise time is 200 milliseconds, the time interval required for the heater current on / off control may be about 500 milliseconds. Therefore, in this embodiment, the temperature detected by the temperature sensors 201 and 202 is compared with the target temperature every 500 milliseconds, and the current of the first heater 110 and the second heater 112 is controlled to be turned on / off. Good.

  Hereinafter, various signals accompanying the recording operation will be described with reference to FIG.

  FIG. 4 is a diagram showing signals supplied from the main board to the recording head via the carriage. First, as a power system signal, a VH power source 401 for heating a heater resistance (not shown) corresponding to a recording element in the recording head 107 with respect to the recording head 107, a VHT power source 402 for driving the heater resistance, and the head A logic power supply VDD 403 is applied. These power supply voltages are generated by the main board 102 or the carriage board 405 mounted in the carriage 101. Further, four types of recording logic signals (LOGIC) 404 of recording data, clock, latch, and heat pulse are transmitted to the recording head. The recording logic signal 404 is generated by the main board 102 and transmitted to the recording head 107 via the FFC 103. The recording head 107 ejects ink from a specific nozzle based on the recording logic signal 404.

  In the conventional recording control, the control of turning on / off the heater resistor current and the recording logic signal 404 are asynchronously controlled. Since a large current of several A to several tens of A flows through the heater resistor during driving, it becomes a large noise source for the surroundings. On the other hand, the recording logic signal 404 is, for example, a low voltage of 3.3V. For this reason, if the heater driving and the supply of the recording logic signal are controlled asynchronously, there is a possibility that the recording logic signal 404 gets crosstalk noise at the timing when the heater current is turned on and off, and the recording operation malfunctions.

  FIG. 5 is a timing chart showing how the recording logic signal and the heater current are turned on and off asynchronously. For example, if the heater current is controlled to be switched from OFF to ON while the recording logic signal is being supplied as in the area A in FIG. 5, crosstalk noise is superimposed on the recording logic signal at the switching timing.

  Therefore, in this embodiment, the recording logic signal 404 and the heater current on / off control are exclusively controlled. Specifically, the heater current is turned on / off in synchronization with a trigger signal transmitted from the main board 102 to the carriage board 405.

  FIG. 6 is a block diagram showing a configuration for preventing superposition of crosstalk noise.

  As shown in FIG. 6, in this embodiment, a signal called an A / D trigger signal 601 is input from the main board 102 to a head temperature acquisition IC (IC) 602 in the carriage board 405. On the other hand, an analog temperature signal 604 from a diode sensor 603 provided in the recording head 107 is input to the head temperature acquisition IC 602. This analog signal is latched by the A / D trigger signal 601 and transmitted to the main board 102.

  Thus, since the A / D trigger signal 601 functions as a latch signal for acquiring the temperature of the recording head 107, the temperature inside the recording head 107 needs to be constant at the moment when the A / D trigger signal 601 is input. There is. Therefore, conventionally, the A / D trigger signal 601 and the recording logic signal 404 are exclusively controlled, and are controlled so as not to generate a recording operation at the time of temperature acquisition. Therefore, in this embodiment, the heater current on / off control is synchronized with the A / D trigger signal 601 to realize exclusive control of the recording logic signal 404 and the heater control.

  FIG. 7 is a block diagram showing a current on / off control configuration of the first heater 110 and the second heater 112 according to the first embodiment. FIG. 8 is a timing chart showing how a recording logic signal and heater current on / off are generated in synchronization.

  According to these figures, when the A / D trigger signal 601 is at a high level (H), the heater current switching enable signal 701 is transmitted from the ASIC 702 of the main board 102 to the heater control circuit 305 of the heater switching board 114. The heater control circuit 305 masks the heater current so that the heater current can be controlled only when the heater current switching enable signal 701 is at a high level (H). For this reason, during heater control every 500 milliseconds, heater current switching is performed only when the heater current switching enable signal 701 is at a high level (H).

  Since the recording logic signal 404 and heater current on / off switching are controlled exclusively, recording is performed even if crosstalk noise is superimposed on the recording logic signal 404 in the region B corresponding to the heater current on / off switching as shown in FIG. It does not affect the operation. Accordingly, erroneous recording due to crosstalk noise does not occur.

  According to the embodiment described above, on / off switching of the recording logic signal and the heater current is controlled exclusively. Therefore, it is not necessary to separate the FFC 103 from the first heater driving wiring 111 and the second heater driving wiring 113 with an insulator, and a configuration in which the heater is mounted on the carriage 101 is obtained at low cost. be able to.

  In the first embodiment, exclusive control of heater current on / off control and supply of a recording logic signal to the recording head 107 is realized by using an A / D trigger 601 signal. As described above, when the A / D trigger 601 signal is at the high level (H), the analog temperature signal 604 from the diode sensor 603 in the recording head 107 is latched. The latched signal is transferred from the carriage 101 to the main board 102 via the FFC 103. For this reason, if crosstalk noise generated when the heater current is switched on / off is superimposed on the analog temperature signal 604, the head temperature may be erroneously recognized.

  In the second embodiment, this problem is solved. Except for the configuration peculiar to this embodiment described below, the configuration is the same as that of the first embodiment, and the description thereof is omitted.

  Although the A / D trigger signal 601 depends on the moving speed of the carriage 101 and the recording resolution, it becomes a high level (H) every about 500 μsec. On the other hand, the heater current switching control is executed at a cycle of about 500 milliseconds. That is, the cycle of the A / D trigger signal 601 is shorter than the cycle of the heater current switching control, and when the A / D trigger signal 601 is generated 1000 times, the heater current switching control is generated once.

  In this embodiment, when the heater current on / off switching control is performed, the analog temperature signal 604 is masked so as not to be latched. As described above, the number of latches of the analog temperature signal 604 is 1000 times the number of times of the heater control, so there is no problem in controlling the head temperature even if the latch is stopped during the heater control.

  FIG. 9 is a timing chart showing how the recording logic signal and the heater current are turned on and off in synchronization with each other according to the second embodiment. According to this timing chart, the mask signal 901 is enabled when both the A / D trigger signal 601 and the heater current switching signal change. This signal is then configured to be disabled at the timing when the clock supplied to the recording head becomes high level (H).

  The hatched portion in FIG. 9 is the mask area 902 described above, and the analog temperature signal 604 is not latched in the mask area 902.

  Therefore, according to the embodiment described above, the input of the analog temperature signal and the heater current on / off switching control are also controlled exclusively. Therefore, even if the crosstalk noise accompanying the heater control is superimposed on the analog temperature signal, the recording head 107 is used. There is no false detection of the temperature.

  In the first and second embodiments, an exclusive control method for a signal that is frequently transmitted and received from the main board 102 to the carriage board 405 via the FFC 103 and that is not easily controlled with the heater current on / off switching control is difficult. explained.

  Here, the signal passing through the FFC 103 is present in addition to the above. For example, a digital signal for controlling the head temperature acquisition IC 602 for acquiring the head temperature, an I2C signal communicating with the EEPROM of the recording head 107, or a drive signal and an output signal of an optical sensor mounted on the carriage 101. There is also a possibility that crosstalk noise is superimposed on such a signal.

  This embodiment solves this problem.

  The configuration of the third embodiment is the same as that of the first and second embodiments. Since the above-described digital signals and analog signals have a low communication frequency, there is no problem even if the transmission / reception timing is slightly shifted. For this reason, the mask signal 901 used in the second embodiment is used, and sequence control is performed so as to suppress transmission and reception while the mask signal 901 is enabled.

  This makes it possible to perform on / off switching control of the heater current for a digital signal for controlling the head temperature acquisition IC 602, an I2C signal for communication with the EEPROM of the recording head 107, an optical sensor drive signal and an output signal without any additional control configuration. Can be exclusive.

  According to the first to third embodiments described above, all digital signals and analog signals transmitted / received via the FFC 103 can be controlled exclusively with the heater current on / off switching control. A malfunction of the recording operation can be prevented.

  In addition, since the FFC 103 and the first heater driving wiring 111 and the second heater driving wiring 113 do not introduce any specially disposed insulators or wiring methods, costs can be reduced. To contribute.

Claims (7)

A recording apparatus that performs recording by discharging ink from the inkjet recording head to a recording medium while reciprocating a carriage on which the inkjet recording head is mounted,
A first heater provided in front of the carriage with respect to a forward direction of reciprocation of the carriage;
A second heater provided at the rear of the carriage with respect to the forward direction of reciprocation of the carriage;
When recording is performed by moving the carriage in the forward direction, the recording medium is heated by the first heater before the ink is ejected by the inkjet recording head, and after the ink is ejected by the second heater. When recording is performed by moving the carriage in the return path direction opposite to the forward path direction while heating the recording medium on which recording has been performed by the ejection of the ink, the second heater is used by the inkjet recording head. The first and second heaters are heated so that the recording medium is heated before ink is discharged, and the recording medium on which recording is performed by the ink is discharged by the first heater after ink is discharged. Controlling heating, timing of supplying a recording logic signal to the inkjet recording head, and the first heater Recording apparatus and the timing of heating to the second heater is characterized in that a control means for controlling so as to be exclusive. The inkjet recording head includes a temperature sensor,
The control means controls to synchronize a latch signal for latching a temperature signal from the temperature sensor and a timing of heating the first heater and the second heater. The recording apparatus according to 1.   The control means further controls the input of the temperature signal from the temperature sensor and the timing of heating the first heater and the second heater to be exclusive. The recording device described in 1. The period for latching the temperature signal from the temperature sensor is shorter than the period for heating the first heater and the second heater,
4. The recording according to claim 3, wherein the control means further masks a latch of a temperature signal from the temperature sensor when heating the first heater and the second heater. apparatus.   When the mask signal for masking the latch of the temperature signal is enabled, the control means is a digital signal for controlling acquisition of the temperature signal, or an I2C signal that communicates with an EEPROM provided in the ink jet recording head. The recording apparatus according to claim 4, wherein control is performed so as to suppress transmission / reception of a drive signal and an output signal of an optical sensor mounted on the carriage. The carriage is
A first temperature sensor for measuring the temperature of the first heater;
A second temperature sensor for measuring the temperature of the second heater,
First comparing means for comparing a temperature detected by the first temperature sensor with a target temperature at a predetermined period;
A second comparison means for comparing a temperature detected by the second temperature sensor with a target temperature at the predetermined period;
The control means controls the heating by the corresponding heater when the detected temperature does not reach the target temperature by the first comparison means and the second comparison means. The recording apparatus according to claim 1. A heater control method for a recording apparatus that performs recording by discharging ink from the inkjet recording head to a recording medium while reciprocating a carriage on which the inkjet recording head is mounted,
A first heater is provided in front of the carriage in the forward direction of the carriage reciprocation, and a second heater is provided in the rear of the carriage in the forward direction of the carriage reciprocation.
When recording is performed by moving the carriage in the forward direction, the recording medium is heated by the first heater before the ink is ejected by the inkjet recording head, and after the ink is ejected by the second heater. Controlling the heating of the first heater and the second heater so as to heat the recording medium on which recording has been performed by discharging the ink;
When recording is performed by moving the carriage in the backward direction opposite to the forward direction, the recording medium is heated by the second heater before the ink is ejected by the inkjet recording head, and the ink is ejected after the ink is ejected. A step of controlling heating of the first heater and the second heater so as to heat the recording medium on which recording has been performed by discharging the ink by the first heater,
In the controlling step, control is performed such that the timing of supplying a recording logic signal to the ink jet recording head and the timing of heating the first heater and the second heater are exclusive. A heater control method for the recording apparatus.

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