JPH11268378A - Cooler and cooling method for printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cool the interior of a printer efficiently. SOLUTION: A dot counter 14 detects the number of dots to be printed by a print engine 2. A printing amount deciding section 15 calculates the accumulated number of printed dots Cm every predetermined time and makes a decision whether the Cm exceeds a preset value or not. A temperature deciding section 1 makes a decision whether the ambient temperature Tm detected by a temperature sensor 13 exceeds a preset level or not. An output control section 17 operates a cooling fan 12 when a predetermined number or more of dots are printed and the ambient temperature Tm exceeds the preset level. Temperature can thereby be detected with a relatively high accuracy without requiring a large number of temperature sensors and the cooling fan 12 can be operated efficiently.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling device and a cooling method for a printer capable of cooling various printers such as an ink jet printer, an impact dot printer and a thermal transfer printer.

[0002]

2. Description of the Related Art When a printer performs printing, the temperature of a print head, a driving transistor, and the like increases. There is no problem as long as this temperature rise stays within the operating temperature range of the transistor etc., but if it exceeds the maximum allowable temperature,
There is a possibility that a transistor or the like may be broken or damaged. Therefore, a printer that generates a large amount of heat is provided with a cooling fan, and by operating the cooling fan under predetermined conditions, a rise in the temperature inside the printer is suppressed.

Conventionally, two methods have been known for controlling a cooling fan. A first conventional technique is, for example, as described in Japanese Patent Publication No. 2-8595 or the like, a temperature sensor monitors whether or not a predetermined temperature has been reached. Is operated. The second prior art counts the print amount of a print head, monitors whether the print amount has reached a predetermined value, and activates a cooling fan when printing is performed at a predetermined value or more. It is.

[0004]

In the first prior art, a temperature sensor is provided to monitor the temperature inside the printer, but it is difficult to accurately measure the temperature of the object to be measured. That is, for example, in order to prevent thermal destruction of the driving transistor, it is preferable to measure the temperature of the junction of the transistor. However, the temperature of the junction is accurately detected due to the external dimensions and heat capacity of the temperature sensor. It's difficult to do,
In addition, providing a temperature sensor for each of a large number of drive transistors significantly increases the cost. Therefore, in practice, one or a plurality of temperature sensors are provided inside the printer to detect the ambient temperature of the transistor.

In the second prior art, when printing is performed at a predetermined value or more, it is considered that the temperature has reached a high temperature, and the cooling fan is operated. However, the actual temperature is determined not only by the printing amount but also by the ambient temperature. That is, the actual temperature of the measurement target (for example, a transistor or the like) differs between a case where the ambient temperature is high and a case where the ambient temperature is low even for the same print amount. Therefore, the control based on only the print amount is
It is simple but lacks accuracy.

In the first prior art and the second prior art, since the temperature measurement accuracy is low, the operating temperature of the cooling fan must be set lower from the viewpoint of fail-safe. Unnecessarily long operation time,
There is also a problem that power consumption increases. In other words, when the operating temperature of the cooling fan is set near the maximum allowable temperature, the possibility of causing thermal damage to the transistor and the like due to a temperature error increases. Therefore, the operating temperature of the cooling fan is set lower in consideration of the temperature error. There is a need to. Accordingly, the operation time of the cooling fan becomes longer, the power consumption increases, and the cooling efficiency decreases.

In particular, in the case of an ink jet printer,
In order to improve the printing speed and the like, the number of nozzles formed in the print head is increased, and the number of lines to be printed in one main scan tends to increase. Therefore, the amount of heat generated by the drive transistor for driving the pressure generating element (piezoelectric vibrator) of each nozzle is likely to increase, and effective cooling is desired. And the cooling efficiency is low.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described various problems, and has as its object to provide a printer cooling device and a printer cooling device capable of efficiently cooling by accurately and simply measuring a temperature. It is to provide a method.

[0009]

In order to achieve the above object, in the cooling device and the cooling method of the printer according to the present invention, the operation of the cooling device is controlled based on both the temperature and the print amount.

According to the first aspect of the present invention, there is provided a cooling device for cooling a printer which performs a predetermined printing by driving a print engine based on print data.
Temperature detection means for detecting a temperature, print amount detection means for detecting a print amount by the print engine, cooling means for cooling the inside of the printer, temperature detected by the temperature detection means, and the printing Cooling control means for controlling the operation of the cooling means based on the print amount detected by the amount detection means.

For example, a temperature detecting means comprising a thermistor, a thermocouple, a platinum resistance temperature detector, etc.
Preferably, an ambient temperature of a place where it is necessary to prevent a failure due to a temperature rise of a transistor or the like is detected. The print amount detection means detects the print amount by the print engine, for example, the number of print dots. Then, the cooling control unit controls the operation of the cooling unit based on the detected temperature and the print amount. That is, for example, the cooling control unit controls the cooling unit to operate to prevent a failure due to a temperature rise, and to stop the operation of the cooling unit to prevent useless power consumption.

By controlling the operation of the cooling means based on the detected temperature and the printing amount, the cooling can be performed with higher accuracy than the control based only on the temperature or the control based on the printing amount alone, and the cooling efficiency can be improved. Can be enhanced.

According to a second aspect of the present invention, when the detected temperature is equal to or higher than a predetermined temperature and the detected print amount is equal to or higher than a predetermined print amount, Activating the cooling unit and controlling to stop the operation of the cooling unit when the detected temperature is equal to or lower than a predetermined temperature and the detected printing amount is equal to or lower than a predetermined printing amount. be able to.

When the printing amount is small even at a high temperature equal to or higher than the predetermined temperature, since the amount of heat generated by energization is small, the actual temperature of the transistor and the like does not reach the maximum allowable temperature. Similarly, even when printing is performed beyond a predetermined printing amount, if the ambient temperature is low, the actual temperature of the transistor and the like does not reach the maximum allowable temperature. Therefore, when the detected temperature is equal to or higher than the predetermined temperature and the detected printing amount is equal to or higher than the predetermined printing amount, the cooling is started. On the other hand, when the printing amount is large even at a low temperature equal to or lower than the predetermined temperature, the amount of heat generated by energization increases, and the temperature of the transistor or the like may be locally high. Similarly, when the ambient temperature is high even if the print amount is small, the local high temperature state may not be eliminated. Therefore, when the detected temperature is equal to or lower than the predetermined temperature and the detected printing amount is equal to or lower than the predetermined printing amount, the cooling is stopped. Thereby, cooling can be performed efficiently. Note that the predetermined temperature and the predetermined printing amount are set to different values for the start of cooling and the stop of cooling, such as the cooling start temperature, the cooling stop temperature, the cooling start printing amount, and the cooling stop printing amount. Can be.

According to a third aspect of the present invention, there is further provided a temperature estimating means for estimating a temperature at a predetermined location based on the detected temperature and the detected printing amount. When the temperature estimated by the temperature estimating means is equal to or higher than a predetermined temperature, the cooling means is operated,
When the estimated temperature becomes equal to or lower than the predetermined temperature, the operation of the cooling unit may be controlled to be stopped.

Here, the predetermined location refers to a predetermined location where a problem due to a rise in temperature is to be prevented, and specifically, for example, corresponds to a driving transistor or the like.

Since the amount of heat generated also changes according to the amount of printing, if the amount of heat generated by printing is considered based on the ambient temperature,
The temperature at a predetermined location can be estimated. Thereby, a predetermined location can be efficiently cooled.

According to a fourth aspect of the present invention, the temperature estimating means estimates a temperature rise at the predetermined location based on the detected print amount, and determines the estimated temperature rise and the detected temperature rise. The temperature at the predetermined location can be estimated by adding the measured temperature.

For example, by performing a preliminary test, the printing amount is changed while the ambient temperature is kept constant, and the temperature rise due to the change in the printing amount is measured in advance, the temperature rise corresponding to the printing amount is obtained. Can be presumably detected. By adding the estimated temperature increase to the detected temperature, the temperature at a predetermined location can be detected relatively accurately, and efficient cooling can be performed.

As in the invention according to claim 5, the print amount is preferably the cumulative number of print dots for each predetermined time.

According to a sixth aspect of the present invention, in the cooling method for cooling the printer by controlling the cooling means,
A first step of detecting a temperature, a second step of detecting a print amount by the print engine, a third step of determining whether the detected temperature is equal to or higher than a predetermined temperature, and A fourth step of determining whether or not the printing amount is equal to or more than a predetermined printing amount; and the detected temperature is equal to or higher than a predetermined temperature, and the detected printing amount is equal to or higher than a predetermined printing amount. When it is determined that the fifth step of operating the cooling means, it is determined that the detected temperature is below a predetermined temperature, and that the detected printing amount is below a predetermined printing amount If
And a sixth step of stopping the operation of the cooling means.

Thus, the same function as the second aspect of the invention can be obtained.

According to a seventh aspect of the present invention, in the cooling method for cooling the printer by controlling the cooling means,
A first step of detecting a temperature, a second step of detecting a print amount by the print engine, and a third step of estimating a temperature at a predetermined location based on the detected temperature and the detected print amount. A fourth step of operating the cooling means when the estimated temperature is equal to or higher than a predetermined temperature, and an operation of the cooling means when the estimated temperature is equal to or lower than the predetermined temperature. And stopping the fifth step.

Thus, the same function as the third aspect of the invention can be obtained.

[0025]

Embodiments of the present invention will be described below in detail with reference to the drawings.

1. 1. First Embodiment 1-1 Configuration First, a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a block diagram illustrating a functional configuration of the printer.

The printer includes a printer controller 1 and
The print engine 2 is provided. The printer controller 1 has an interface (hereinafter referred to as “I /
F ") 3, an input buffer 4, an interpreter 5, and an output buffer 6. I / F from host computer
The print data received via the input buffer 3 is temporarily stored in the input buffer 4. The interpretation unit 5 interprets the print data to generate print image data, and expands the print image data in the output buffer 6. The print image data developed in the output buffer 6 is transmitted to the print engine 2.

The print engine 2 is configured as, for example, an ink jet engine, a thermal transfer engine, or the like. The print engine 2 includes an output buffer 6
The printing is performed based on the print image data developed in. For example, in the case of an ink jet type engine, a print head having a large number of nozzles formed in the sub-scanning direction, a carriage mechanism for moving the print head in the main scanning direction, and a device for transporting the print recording medium in the sub-scanning direction. Paper feed mechanism and print engine 2
Is configured.

The cooling device is provided with a cooling control unit 11, a cooling fan 12, and a temperature sensor 13 as described later.

The cooling controller 11 is provided, for example, in the printer controller 1 and has a dot counter 14.
, A print amount determination unit 15, a temperature determination unit 16, and an output control unit 17. The dot counter 14 as “print amount detecting means” detects the number of dots printed by the print engine 2. The print amount determination unit 15 calculates the cumulative number of print dots for each predetermined time based on the number of print dots detected by the dot counter 14, and determines whether the cumulative number of print dots has reached a predetermined value. It is to judge. Temperature determination unit 16
Is for determining whether or not the temperature detected by the temperature sensor 13 has reached a predetermined temperature set in advance. The output control unit 17 controls energization of the cooling fan 12 based on the determination result by the print amount determination unit 15 and the determination result by the temperature determination unit 16.

The cooling fan 12 as “cooling means”
For example, it is installed in a printer so that cold air can be supplied to a drive transistor to be cooled. The temperature sensor as the “temperature detecting means” includes, for example, a temperature detecting element such as a thermistor or a thermocouple, and is mounted near the radiator of the driving transistor. The specific mounting positions of the cooling fan 12 and the temperature sensor 13 will be described later with reference to FIG.

Next, the operation of this embodiment will be described with reference to FIGS. FIG. 2 is a flowchart showing the cooling control process. In FIG. 2, steps (hereinafter abbreviated as “S”) 1 to S
5 shows a cooling start process, and S6 to S10 show a cooling stop process.

In the cooling start process, first, based on a signal from the dot counter 14, an accumulated number of print dots Cm (displayed as "number of print dots" in the figure) Cm at predetermined time intervals is detected. Next, monitoring is performed until the cumulative print dot number Cm becomes equal to or greater than the preset cooling start print dot number Con (S2). When the cumulative print dot number Cm reaches the cooling start print dot number Con, an ambient temperature Tm near the drive transistor is detected based on a signal from the temperature sensor 13 (S3), and the ambient temperature Tm is set to a preset cooling start temperature. Monitoring is performed until Ton is reached (S4). When the detected ambient temperature Tm reaches the cooling start temperature Ton, a fan drive signal is output from the output control unit 17 and the cooling fan 12
Starts operating (S5).

As described above, in the cooling start process, the cooling fan 12 is operated when the cumulative print dot number Cm becomes equal to or more than the cooling start print dot number Con and the ambient temperature Tm becomes equal to or higher than the cooling start temperature Ton. .

Next, in the cooling stop processing, the cumulative print dot number Cm is detected (S6), and monitoring is performed until the cumulative print dot number Cm falls below the preset cooling stop print dot number Coff (S7). If the cumulative print dot number Cm reaches the cooling stop print dot number Coff, the ambient temperature T
m is detected (S8), and monitoring is performed until the ambient temperature Tm falls below a preset cooling stop temperature Toff (S8).
9). When the ambient temperature Tm becomes equal to or lower than the cooling stop temperature Toff, the operation of the cooling fan 12 is stopped by stopping the fan drive signal (S10).

As described above, in the cooling stop processing, the cooling fan 12 is stopped when the cumulative print dot number Cm becomes equal to or less than the cooling stop print dot number Con and the ambient temperature Tm becomes equal to or lower than the cooling stop temperature Toff. .

FIG. 3 is a time chart showing changes in each signal. FIG. 3 shows, in order from the top, the ambient temperature of the drive transistor to be cooled, the cumulative number of print dots Cm,
A head drive signal and a fan drive signal are shown.

At time t1, the ambient temperature Tm of the transistor rises to the cooling start temperature Ton, and at time t2 the cumulative print dot number Cm rises to the cooling start print dot number Con, the cooling start condition is satisfied, and the fan drive signal is output. Is output. Then, at time t3, the ambient temperature Tm becomes equal to the cooling stop temperature T.
When the cumulative print dot number Cm decreases to the cooling stop print dot number Coff at time t4, the cooling stop condition is satisfied and the fan drive signal is stopped.

Thereafter, similarly, at time t5, the ambient temperature Tm of the transistor rises again to the cooling start temperature Ton, and at time t6, when the cumulative print dot number Cm reaches the cooling start print dot number Con, the cooling start condition is satisfied. Output a fan drive signal. When the ambient temperature Tm decreases to the cooling stop temperature Toff at time t7 and the cumulative print dot number Cm decreases to the cooling stop print dot number Coff at time t8, the cooling stop condition is satisfied and the fan drive signal is stopped. .

According to the present embodiment configured as described above, the following effects can be obtained.

First, since the operation of the cooling fan 12 is controlled based on the cumulative print dot number Cm and the ambient temperature Tm, the cooling control is higher than the cooling control based only on the cumulative print dot number or the cooling control based only on the ambient temperature. The cooling can be performed with high accuracy, and the cooling efficiency can be improved. That is, the actual temperature of the object to be cooled is the ambient temperature Tm and the actual operating state C.
Therefore, according to this embodiment, the temperature can be detected easily and with relatively high accuracy without providing a temperature sensor for each transistor. Therefore, the cooling fan 12 can be operated efficiently, and power consumption and manufacturing cost can be reduced.

Second, when the cumulative print dot number Cm is equal to or higher than the cooling start print dot number Con and the ambient temperature Tm is equal to or higher than the cooling start temperature Ton, the cooling fan 12 is operated, and the cumulative print dot number Cm is determined. Is smaller than the cooling stop print dot number Coff and the ambient temperature Tm is lower than the cooling stop temperature Toff, the cooling fan 12 is stopped, so that the cooling control can be simplified. Therefore, the entire control logic can be constituted by a relatively simple hardware circuit, and the manufacturing cost and the like can be reduced.

FIG. 4 is a perspective view schematically showing a mounting position of the temperature sensor 13 and the like. The drive transistor (only one is shown) 21 is attached to the radiator 22.
The temperature sensor 13 such as a thermistor
1 and is attached to the radiator 22.
The cooling fan 12 is mounted so as to supply cool air to the radiator 22 to promote heat radiation. In addition,
23 is a print head, 24 is a controller unit, and 25 is a power supply unit.

2. Second Embodiment Next, a second embodiment of the present invention will be described with reference to FIGS. In the following embodiments, the same components as those in the above-described first embodiment are denoted by the same reference numerals, and description thereof will be omitted. The feature of the present embodiment is that the actual temperature of the transistor is estimated from the accumulated print dot number Cm and the ambient temperature Tm.

FIG. 5 is a block diagram of the printer according to the present embodiment. The cooling control unit 32 in the printer controller 31 includes the dot counter 14 and the output control unit 17.
, A temperature estimating unit 33, a temperature rise map 34, and a temperature correction map 35.

Temperature estimating section 33 as "temperature estimating means"
Is the cumulative print dot number C detected by the dot counter 14.
m and the ambient temperature Tm detected by the temperature sensor 13, the actual temperature of the transistor to be cooled is calculated as the estimated temperature T.
It is for estimating as c.

As shown in FIG. 6A, the temperature addition map 34 stores a temperature addition ΔT to be added in accordance with the cumulative print dot number Cm. The characteristic is set such that the temperature addition ΔT increases as the cumulative print dot number Cm increases. On the other hand, as shown in FIG.
The base temperature map 35 stores an estimated base temperature Tcb corresponding to the ambient temperature Tm. The characteristic is set such that the estimated base temperature Tcb increases as the ambient temperature Tm increases. Here, each of the maps 34 and 35 can be obtained by simulation of temperature characteristics by a computer, temperature measurement by an actual machine, or the like. Further, for example, the temperature addition map 34 can be expressed as “temperature rise calculating means”, and the basic temperature map 35 can be expressed as “estimated basic temperature calculating means”.

The temperature estimating unit 33 calculates the estimated base temperature Tcb by referring to the base temperature map 35 based on the ambient temperature Tm detected by the temperature sensor 13. Next, the temperature estimating unit 33 refers to the temperature addition map 34 based on the cumulative print dot number Cm detected by the dot counter 14 to calculate the temperature addition ΔT in order to correct the heat generation corresponding to the print amount. calculate. Then, the temperature estimating unit 3
3 estimates the actual temperature of the transistor as the estimated temperature Tc by adding the temperature addition ΔT to the estimated base temperature Tcb (Tc = Tcb + ΔT).

FIG. 7 is a flowchart showing a cooling control process according to the present embodiment. First, dot counter 1
4 to detect the cumulative number of print dots Cm (S21), and then detect the ambient temperature Tm of the transistor based on the signal from the temperature sensor 13 (S22).
Then, as described above, the actual temperature of the transistor is estimated as the estimated temperature Tc by adding the temperature addition ΔT to the estimated base temperature Tcb (S23). Next, the estimated temperature T
It is determined whether or not c is equal to or higher than a preset reference temperature Ts (S24). If the estimated temperature Tc is equal to or higher than the reference temperature Ts, a fan drive signal is output to operate the cooling fan 12 (S25). On the other hand, when the estimated temperature Tc does not reach the reference temperature Ts, the cooling fan 12 is stopped (S2).
6).

In this embodiment having the above structure,
The same effects as in the first embodiment can be obtained. In addition to this, in the present embodiment, the ambient temperature Tm
Since the actual temperature of the transistor is estimated based on the accumulated print dot number Cm and the operation of the cooling fan 12 is controlled based on the estimated temperature Tc, the cooling control can be performed with higher accuracy.

3. Third Embodiment Next, FIG. 8 shows a block diagram of a printer according to a third embodiment of the present invention. The features of this embodiment are:
The point is that the cumulative print dot number Cm is detected based on the print image data developed in the output buffer 6.

In this embodiment configured as described above,
The same effects as in the first embodiment can be obtained. In addition to this, in the present embodiment, since the cumulative print dot number Cm can be detected in advance based on the image data before printing stored in the output buffer 6, cooling is performed before the temperature of the transistor rises by printing. Fan 12
Can be operated, and thermal destruction of the transistor can be prevented.

It should be noted that those skilled in the art can make various additions and changes within the scope of the present invention described in each embodiment.

For example, the object to be cooled is not limited to the driving transistor. It may be configured to cool other members that are easily affected by the temperature rise.

Further, the present invention is not limited to an ink jet printer, but can be applied to other types of printers such as a thermal transfer printer, an impact dot printer, and a laser printer. When the present invention is applied to a page printer such as a laser printer, the number of prints per predetermined time may be used as the print amount.

[0056]

As described above, according to the printer cooling device and the cooling method of the present invention, it is possible to detect the temperature relatively accurately and easily without using a plurality of temperature sensors. Efficiency can be increased and power consumption can be reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram of a printer to which a first embodiment of the present invention is applied.

FIG. 2 is a flowchart illustrating a cooling control process.

FIG. 3 is a time chart showing changes in the ambient temperature, the cumulative number of print dots, the fan drive state, and the like.

FIG. 4 is a perspective view schematically showing an arrangement and the like of a temperature sensor.

FIG. 5 is a block diagram of a printer to which a second embodiment of the present invention is applied.

6A and 6B show the structure of a map for estimating the actual temperature of a transistor; FIG. 6A is an explanatory diagram of a temperature addition map;
(B) is an explanatory diagram of a base temperature map.

FIG. 7 is a flowchart illustrating a cooling control process.

FIG. 8 is a block diagram of a printer to which a third embodiment of the present invention is applied.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Printer controller 2 Print engine 6 Output buffer 11 Cooling control unit 12 Cooling fan 13 Temperature sensor 14 Dot counter 15 Print amount judgment unit 16 Temperature judgment unit 17 Output control unit 21 Driving transistor 23 Printhead 31 Printer controller 32 Cooling control unit 33 Temperature Estimator 34 Temperature addition map 35 Base temperature map

Claims (7)

[Claims] 1. A cooling device for cooling a printer that performs predetermined printing by driving a print engine based on print data, comprising: a temperature detecting unit for detecting a temperature; and a print amount by the print engine. Print amount detecting means for detecting, cooling means for cooling the inside of the printer, operation of the cooling means based on the temperature detected by the temperature detecting means and the print amount detected by the print amount detecting means. And a cooling control unit for controlling the cooling device. 2. The cooling control means operates the cooling means when the detected temperature is equal to or higher than a predetermined temperature and the detected print amount is equal to or higher than a predetermined print amount. 2. The control device according to claim 1, wherein when the detected temperature is equal to or lower than a predetermined temperature and the detected printing amount is equal to or lower than the predetermined printing amount, the operation of the cooling unit is stopped.
A cooling device for a printer according to claim 1. 3. A temperature estimating means for estimating a temperature at a predetermined position based on the detected temperature and the detected printing amount, wherein the cooling control means includes a temperature estimating means for estimating the temperature estimated by the temperature estimating means. The control according to claim 1, wherein the control unit controls the cooling unit to be activated when the temperature is equal to or higher than a predetermined temperature, and to stop the operation when the estimated temperature is equal to or lower than the predetermined temperature. Printer cooling device. 4. The temperature estimating means estimates a temperature rise at the predetermined location based on the detected print amount, and adds the estimated temperature rise and the detected temperature. 4. The cooling device for a printer according to claim 3, wherein the temperature of the predetermined location is estimated. 5. The cooling device for a printer according to claim 1, wherein the print amount is a cumulative number of print dots for each predetermined time. 6. A cooling method for cooling a printer by controlling a cooling unit, wherein: a first step of detecting a temperature; a second step of detecting a print amount by the print engine; A third step of determining whether or not the detected temperature is equal to or higher than a predetermined temperature; a fourth step of determining whether or not the detected print amount is equal to or higher than a predetermined print amount; And if it is determined that the detected printing amount is equal to or more than a predetermined printing amount, a fifth step of operating the cooling unit; and the detected temperature is equal to or lower than a predetermined temperature. And a sixth step of stopping the operation of the cooling means when it is determined that the detected print amount is equal to or less than a predetermined print amount. Rejection method. 7. A cooling method for cooling a printer by controlling a cooling means, wherein a first step of detecting a temperature, a second step of detecting a print amount by the print engine, A third step of estimating the temperature of a predetermined location based on the detected print amount; and, when the estimated temperature is equal to or higher than a predetermined temperature,
A fourth step of operating the cooling unit; and a fifth step of stopping the operation of the cooling unit when the estimated temperature is equal to or lower than the predetermined temperature.
A method for cooling a printer, comprising: