JP4577503B2 - Printing method determining apparatus, printing apparatus, and printing method determining method - Google Patents

Description

  The present invention relates to a printing method determination device, a printing device, and a printing method determination method. The present invention relates to a printing method determination device, a printing device, and a printing method determination method, particularly for determining a printing method for a printing recording medium.

In recent years, in a printing apparatus such as an ink jet printer, various printing recording media are properly used depending on the desired image quality of a printed matter, and a printing method suitable for each printing recording medium is set by a driver for printing. At this time, the user of the printing apparatus has to input the type of recording medium for printing and the like, which is not only troublesome, but also causes problems such as inappropriate input. Therefore, a method for automatically identifying a printing recording medium has been developed. For example, Patent Document 1 discloses a method of identifying a printing recording medium by detecting transmitted light or reflected light through the printing recording medium.
Japanese Patent Laid-Open No. 2000-301805

  An object of the present invention is to provide a printing method determination device, a printing device, and a printing method determination method capable of determining a printing method suitable for a printing recording medium.

The printing method determining apparatus according to the present invention includes:
A porosity evaluation unit for evaluating the porosity of the recording medium for printing;
Based on the evaluation value evaluated by the porosity evaluation unit, a printing method determination unit that determines a printing method of the recording medium for printing,
Including
The porosity evaluation unit has a pressurizing device that pressurizes the printing surface of the printing recording medium from the opening, and a pressure sensor that detects the pressure in the pressurizing device,
After the pressure device pressurizes the printing surface of the printing recording medium, the void ratio is evaluated based on the pressure value in the pressure device detected by the pressure sensor.

In the printing method determination apparatus according to the present invention,
Based on the evaluation value evaluated by the porosity evaluation unit, further includes a recording medium identification unit for identifying the type of the recording medium for printing,
The printing method determining unit can determine the printing method corresponding to the type of the printing recording medium identified by the recording medium identifying unit as the printing method for the printing recording medium.

In the printing method determination apparatus according to the present invention,
The image forming apparatus may further include a pressing unit that presses the opening against the printing surface of the printing recording medium.

In the printing method determination apparatus according to the present invention,
A stage for placing the recording medium for printing;
The pressing portion can press the opening from above onto the printing surface of the printing recording medium placed on the stage.

In the printing method determination apparatus according to the present invention,
The void ratio evaluation unit is configured to determine the gap based on a pressure value in the pressure device after a predetermined period of time has elapsed since the opening of the pressure device is brought into close contact with the recording medium for printing and pressurization is started. Rate can be evaluated.

In the printing method determination apparatus according to the present invention,
The elapsed time from when the opening of the pressurizing device is brought into close contact with the printing recording medium to start pressurization until the rate of change of the pressure value in the pressurizing device becomes a predetermined value or less is the predetermined period. A period determining unit that is determined in advance can be further included.

In the printing method determination apparatus according to the present invention,
The porosity evaluation unit determines the porosity based on an attenuation rate at which the pressure value attenuates from the highest pressure value after the pressurizing device pressurizes the printing surface of the printing recording medium. Can be evaluated.

In the printing method determination apparatus according to the present invention,
The void ratio evaluation unit presses the pressurizing device with the opening of the pressurizing device in close contact with the printing recording medium until the rate of change of the pressure value in the pressurizing device becomes a predetermined value or less. Time can be evaluated as the porosity.

In the printing method determination apparatus according to the present invention,
The porosity evaluation unit is configured to apply pressure when the opening of the pressurizing device is in close contact with the recording medium for printing, and the rate of change of the pressure value in the pressurizing device becomes a predetermined value or less. The pressure value can be evaluated as the porosity.

In the printing method determination apparatus according to the present invention,
The printing method determination unit can determine the dot diameter of the ink as a printing method used for the printing recording medium based on the evaluation value evaluated by the porosity evaluation unit.

In the printing method determination apparatus according to the present invention,
The printing method determination unit can determine the dot density of the ink as a printing method used for the printing recording medium based on the evaluation value evaluated by the porosity evaluation unit.

In the printing method determination apparatus according to the present invention,
The printing method determination unit can determine a printing timing as a printing method used for the printing recording medium based on the evaluation value evaluated by the porosity evaluation unit.

A printing apparatus according to the present invention includes any one of the above-described printing method determination apparatuses,
And a printing unit that prints on the printing recording medium using the printing method determined by the printing method determination device.

The method for determining the printing method according to the present invention is as follows.
Evaluate the porosity of the recording medium for printing,
A printing method for the printing recording medium is determined based on the evaluated value.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

1. Printing Device FIG. 1 is a block diagram illustrating a functional configuration of a printing device according to the present embodiment. The printing apparatus 100 according to the present embodiment includes a printing method determination apparatus 200. The printing method determination apparatus 200 includes a porosity evaluation unit 220, a recording medium identification unit 230, and a printing method determination unit 240.

  The porosity evaluation unit 220 evaluates the porosity of the printing recording medium and sends the evaluation value to the recording medium identification unit 230. The recording medium identification unit 230 identifies the type of the recording medium for printing based on the evaluation value from the void ratio evaluation unit 220 and sends type information indicating the identified type to the printing method determination unit 240. The printing method determination unit 240 reads the printing method associated with the type information received from the recording medium identification unit 230 and sends it to the printing control unit 130.

  The printing apparatus 100 further includes a print control unit 130, a printing unit 140, a transport mechanism 150, a communication unit 120, and a storage unit 110. The printing control unit 130 controls the printing method determination device 200, the printing unit 140, and the transport mechanism 150 based on information received from the printing method determination device 200, the storage unit 110, and the communication unit 120. The printing unit 140 prints on a printing recording medium according to the control of the printing control unit 130. The transport mechanism 150 transports the printing recording medium according to the control of the print control unit 130.

  The storage unit 110 serves as a work area for realizing various processing functions of the print control unit 130 and the printing method determination apparatus 200 in addition to storing various setting data (for example, measurement control data). The function can be realized by hardware such as RAM, ROM, optical disk, magneto-optical disk. The storage unit 110 may store a program for causing each unit of the printing apparatus 100 to function. In addition, instead of the storage unit 110, the functions of the respective units of the printing apparatus 100 described above can be realized by downloading a program or the like for realizing the above-described functions from a host device or the like via a transmission path. It is.

  The communication unit 120 receives image data to be printed on a printing recording medium, information on the printing apparatus 100, and the like from an external computer or the like, or transmits the information to an external computer or the like.

  Next, details of the printing method determination apparatus 200 will be described. FIG. 2 is a schematic diagram schematically showing the printing apparatus 100. As shown in FIG. 2, the porosity evaluation unit 220 includes a pressurizing device 226, a pressure sensor 221, a control unit 229, a pressure sensor 221, a pressing unit 228, a tube support unit 227, and a stage 222. Have.

  The pressurizing device 226 includes a tube 224, and pressurizes the printing surface of the printing recording medium 170 from the opening 225 of the tube 224. The pressure sensor 221 detects the pressure in the pressurizing device 226. The pressure sensor 221 according to the present embodiment detects the pressure in the tube 224 of the pressurizing device 226. A known pressure sensor can be used as the pressure sensor 221, and the pressure is output as an analog or digital signal. As shown in FIG. 3, the tip of the tube 224 on the opening 225 side preferably has a circular cross section. Accordingly, the tube 224 can be in close contact with the printing recording medium 170 with a high degree of adhesion. As the pressurizing device 226, a device capable of generating a pressure of 1.1 atm or more is preferable. For example, a device in which a piston, a rubber ball, a bellows, and a driving device for driving them can be used. . The tube 224 may be made of any material as long as it is not deformed by the pressure applied by the pressure device 226, and plastic, rubber, metal, or the like can be used. However, the distal end of the tube 224 on the side of the opening 225 is pressed against the printing recording medium 170 as will be described later. Therefore, the tube 224 is preferably made of a soft material that can be in close contact with the printing recording medium 170, for example, rubber. Is desirable. The inner diameter of the tube 224 is preferably such that no internal pressure loss occurs, and can be, for example, about 1 mm to about 40 mm.

  A printing recording medium 170 is placed on the stage 222. The pressing unit 228 includes a tube support unit 227 that supports the tube 224 and presses the opening 225 of the tube 224 against the printing surface of the printing recording medium 170 in the direction of arrow a. At this time, the printing recording medium 170 is pressed onto the stage 222. Therefore, it is desirable that the stage 222 is smooth so that the printing recording medium 170 is not deformed by pressure. Further, the stage 222 is preferably made of plastic, metal, or the like having a hardness that does not deform due to pressure. By having the stage 222 in this way, it is possible to prevent the printing recording medium 170 from being deformed by the force pressing the tube 224.

  The control unit 229 controls the pressurizing device 226, the pressure sensor 221, and the pressing unit 228. The control unit 229 receives a pressure value from the pressure sensor 221 and evaluates the porosity based on the pressure value. The printing apparatus 100 further includes a printing recording medium holding unit 160. The printing recording medium holding unit 160 can hold a plurality of printing recording media 170.

  In addition, the printing apparatus 100 includes a display unit that outputs an image of the setting state or operation state of the printing apparatus 100 as necessary, an input unit for an operator of the printing apparatus 100 to input various setting data and operation data, and the like. (Not shown).

  The porosity evaluation unit 220 makes the pressure in the pressurizing device 226 after a predetermined period has passed since the pressurizing device 226 pressurizes the pressurizing device 226 with the opening 225 in close contact with the printing recording medium 170. The value is evaluated as the porosity. Printing recording media have different ink absorption characteristics depending on the size and number of voids. Therefore, by measuring the void ratio, which is a numerical value based on the size and number of the voids, using the printing method determining apparatus 200 shown in FIG. 2, the type of the printing recording medium can be identified, and the printing recording medium can be identified. A suitable printing method can be determined.

2. Next, the printing method determination method and the operation of the printing apparatus 100 will be described in detail.

  (1) First, when the print control unit 130 receives support and image data indicating that printing should be performed from the outside via the communication unit 120, the print control unit 130 stores the print recording medium 170 held in the print recording medium holding unit 160. As shown in FIG. 2, it is transported onto the stage 222 using the transport mechanism 150.

  (2) Next, the porosity evaluation unit 220 evaluates the porosity of the conveyed printing recording medium 170. Specifically, the pressure value (attainment pressure) detected by the pressure sensor 221 after a predetermined period of time has elapsed after the opening 225 of the tube 224 is brought into close contact with the printing recording medium 170 and the pressure device 226 pressurizes. Value.

  Here, the predetermined period means that the rate of change of the pressure value of the pressure sensor 221 is less than or equal to a predetermined value after the pressure device 226 starts to press the opening 225 of the tube 224 in close contact with the recording medium 170 for printing. Is the elapsed time. After the pressurizing device 226 pressurizes, the inside of the pressurizing device 226 once reaches the maximum pressure, and then the pressure is attenuated by the permeation of air through the printing recording medium 170. The pressure sensor 221 measures the rate of change of the pressure value when the pressure is attenuated. The elapsed time until the change rate of the pressure value becomes a predetermined value or less means the time until the pressure value becomes substantially constant. By evaluating the void ratio using the pressure value (the ultimate pressure) after the time until the pressure value becomes substantially constant, the printing apparatus 100 can perform a more appropriate printing method for the printing recording medium 170. Can be determined.

  (3) Next, the recording medium identifying unit 230 identifies the type of the printing recording medium 170 based on the evaluation value evaluated by the porosity evaluation unit 220. Specifically, the recording medium identification unit 230 reads the type of the printing recording medium associated with the ultimate pressure detected by the pressure sensor 221 in the type database 112 and sends it to the printing method determination unit 240. FIG. 4 shows an example of the data format of the type database 112. The type database 112 stores the ultimate pressure in association with the type of recording medium for printing. The type database 112 is stored in the storage unit 110, for example. For example, when the ultimate pressure is 270 Torr, the recording medium identification unit 230 reads “special paper” from the type database 112.

  (4) Next, the printing method determination unit 240 determines the printing method based on the type of the printing recording medium 170. Specifically, the recording medium identification unit 230 determines a printing method corresponding to the type of the printing recording medium 170 read by the recording medium identification unit 230. Examples of the printing method include ink dot diameter, dot density, and printing timing. When the printing method determination unit 240 receives information indicating “exclusive paper” from the recording medium identification unit 230, the printing method determination unit 240 displays information that is set in advance as a printing method setting suitable for “exclusive paper”. The printing method 170 is determined.

  (5) Next, the print control unit 130 uses the conveyance mechanism 150 to convey the printing recording medium 170 so that the printing unit 140 can perform printing, and uses the printing unit 140 according to the printing method determined by the printing method determination unit 240. To print.

  By operating as described above, the printing apparatus 100 can determine a printing method suitable for the properties of the printing recording medium 170 even if the type of the printing recording medium 170 is unknown.

  By using the transport mechanism 150, the porosity evaluation unit 220 can measure the ultimate pressure of the subsequent printing recording medium 170 while the previous printing recording medium 170 is being printed. Prolonging the time from when data is received until printing is completed can be suppressed.

3. Experimental Example The following experiment was performed on the porosity evaluation unit 220 of the printing apparatus 100 according to the present embodiment.

The ultimate pressure was measured using the apparatus shown in FIG. 5 for 10 types of printing paper (printing recording medium) that can be used in an inkjet printer. FIG. 5 is a diagram schematically showing an apparatus used in the experimental example. As the pressurizing device 226, a 6.5 cm ³ volume glass syringe was used. A three-way cock 252 was provided and connected between the first tube 254 and the second tube 256. As the first tube 254 and the second tube 256, silicone tubes having an outer diameter of 10 mm, an inner diameter of 5 mm, and a length of 10 cm were used. As shown in FIG. 6, the tip of the first tube 254 on the opening 255 side has an arc shape by folding the tip of the silicone tube outward. The pressing portion 228 is disposed immediately below the first tube 254. The pressing unit 228 can adjust the height of the stage 222 and the printing recording medium 170 placed on the stage 222. The support portion 250 can support the first tube 254 so that the position of the first tube 254 does not change. A glass syringe 259 having a capacity of 10 cm ³ is connected to the tip of the second tube 256 opposite to the three-way cock 252 and is placed on the upper pan balance 258. The glass syringe 259 and the balance 258 can function as a pressure sensor. The balance 258 was pointing to the mass 18 g of the glass syringe 259 when the opening 255 was open.

Cut the printing paper into approximately 3 cm square, place it on the stage 222, push up the stage 222 in the direction of arrow b, and press the first tube 254 so that the tip on the opening 255 side is pressed against the printing paper 170. Part 228 was adjusted. At this time, it is considered that a force of about 800 g / cm ² was applied to the stage 222 by the tip of the first tube 254 on the opening 255 side. Thereafter, the piston of the glass syringe as the pressurizing device 226 was pressed down in the direction of the arrow c and pressurized. The pressure in the second tube 256 can be calculated from the weight applied to the balance 258 after pressurization. The damping rate was calculated by the following equation, with the pressure at the time of opening as the initial pressure, the maximum value immediately after pressurization as the maximum pressure, and the pressure value about 5 seconds after pressurization as the ultimate pressure.
Damping rate = (maximum pressure−pressure after 5 seconds) × 100 / (maximum pressure−initial pressure)
The above measurement was performed three times for each printing paper, and the attenuation rate was calculated. The results are shown in FIG.

  According to FIG. 7, the ultimate pressure of printing paper sold as plain paper is 178 Torr to 224 Torr, and the ultimate pressure of printing paper sold as coated paper is 254 Torr to 284 Torr. The ultimate pressure of printing paper sold as resin-coated semi-glossy paper or resin-coated glossy paper was 306 Torr to 386 Torr.

  Normally, printing paper sold as plain paper is printed with the driver setting for plain paper, and printing paper sold as coated paper is printed with the driver setting for special paper, coated glossy paper, resin coated Printing paper sold as semi-glossy paper or resin-coated glossy paper can perform printing suitable for each printing paper by setting the glossy paper driver. Therefore, according to the calculation result of the attenuation rate, the printing method determination apparatus 200 uses a printing method corresponding to plain paper if the attenuation rate is about 35 or more, and corresponds to special paper if the attenuation rate is about 18. It was confirmed that a printing method suitable for each printing paper can be determined by using a printing method and using a printing method corresponding to glossy paper if the attenuation factor is 5 or less. That is, the printing apparatus 100 provided with the printing method determination apparatus 200 identifies the type by measuring the ultimate pressure or the attenuation rate even if the type of the printing recording medium is unknown in advance, and each printing recording medium Printing suitable for the medium can be performed.

  In FIG. 7, the resin-coated semi-gloss paper of No. 8 and the resin-coated glossy paper of No. 9 use the same coating layer and differ only in the surface shape, so the same printing method should be selected originally. However, another printing method may be selected as another method for determining printing paper based on light reflectance or the like. However, according to this experimental example, since they have the same ultimate pressure, the same printing method can be selected.

4). The present invention is not limited to the above-described embodiment, and for example, the following modifications are possible.

4.1. First Modification The printing method determination device 200 of the printing apparatus 100 changes the pressure value of the pressure sensor 221 after the pressure device 226 starts to press the tube 224 with the opening 225 in close contact with the printing recording medium 170. It may further include a period determining unit that determines a “predetermined period” that is an elapsed time until the rate becomes equal to or less than a predetermined value. For example, by providing the period determination unit, the printing apparatus 100 can update the predetermined period according to the usage state of the pressure device 226. Thereby, for example, even when the time required to reach the ultimate pressure is shortened due to the deterioration of the performance of the pressurizing device 226 and the elapsed time until the ultimate pressure is shortened, by changing the predetermined period, A suitable printing method can be determined. In other words, by further including the period determining unit, the printing apparatus 100 can change the predetermined period according to various situations such as the printing medium and the pressurizing force of the pressurizing apparatus, and reach a higher reliability. The pressure can be measured.

4.2. Second Modification The type database 112 shown in FIG. 4 stores the ultimate pressure and the type of the printing recording medium 170 in association with each other, but instead of this, the printing method such as the ultimate pressure and the dot diameter is changed. You may store correspondingly. Thereby, the printing apparatus 100 can determine the printing method directly from the ultimate pressure. That is, the printing apparatus 100 can determine the printing method directly from the ultimate pressure value even for an unknown printing recording medium without providing categories such as “plain paper” and “glossy paper”. .

4.3. Third Modification As shown in FIG. 3, the cross section of the tip of the tube 224 on the side of the opening 225 is arcuate, but instead, as shown in FIG. 8, the opening 325 of the tube 324 is opened. The tip on the side may be flat. Moreover, as shown in FIG. 9, the tip of the opening 425 side of the tube 424 may be pointed. By selecting a shape suitable for the material of the tube from these shapes, the tube can be adhered to the printing recording medium with higher adhesion.

4.4. Fourth Modification Although all the functions of the printing method determination apparatus 200 according to the present embodiment are provided in the printing apparatus 100, some functions of the printing method determination apparatus 200 are replaced by printing. It can also be realized by a computer outside the apparatus 100. In this case, for example, the pressurizing device 226, the pressure sensor 221, the tube 224, the pressing unit 228, and the stage 222 included in the porosity evaluation unit 220 are provided in the printing apparatus 100, but the pressure value detected by the pressure sensor 221 is used. The external recording medium identification unit 230 receives via the communication unit 120 and determines the type of the printing recording medium 170.

4.5. Fifth Modification The printing apparatus 100 may periodically update the type database 112 shown in FIG. In addition, FIG. 4 stores the pressure value (Torr) of the ultimate pressure, but instead of this, the attenuation rate described in the experimental example may be stored. For example, the printing method determination apparatus 200 can periodically calculate the maximum pressure and the initial pressure and update the type database 112. Thereby, even when the pressure device 226 or the like deteriorates, the printing apparatus 100 can determine a printing method suitable for the printing recording medium.

4.6. Sixth Modification Although the porosity evaluation unit 220 described above evaluates the ultimate pressure as the porosity, instead, the opening 225 of the tube 224 is brought into close contact with the printing recording medium 170 and pressurized. You may evaluate the elapsed time until the rate of change of a subsequent pressure value becomes below a predetermined value as a porosity. Moreover, reliability can be improved more by using both this elapsed time and ultimate pressure.

4.7. Seventh Modification Although the porosity evaluation unit 220 described above evaluates the ultimate pressure after a predetermined period of time as the porosity, the opening 225 of the tube 224 is replaced with the printing recording medium 170 instead. You may evaluate the pressure value when the rate of change of the pressure value after making it adhere | attach and pressurize becomes below a predetermined value as a porosity. Thereby, since the measurement time can be changed according to the recording medium for printing, the measurement time can be shortened.

  The present invention is not limited to the above-described embodiments, and various modifications can be made. For example, the present invention includes configurations that are substantially the same as the configurations described in the embodiments (for example, configurations that have the same functions, methods, and results, or configurations that have the same purposes and results). In addition, the invention includes a configuration in which a non-essential part of the configuration described in the embodiment is replaced. In addition, the present invention includes a configuration that achieves the same effect as the configuration described in the embodiment or a configuration that can achieve the same object. Further, the invention includes a configuration in which a known technique is added to the configuration described in the embodiment.

1 is a block diagram showing a functional configuration of a printing apparatus according to an embodiment. 1 is a diagram schematically showing a printing apparatus according to an embodiment. Sectional drawing which shows the front end by the side of the opening part of the tube concerning this Embodiment. The figure which shows the data format of a kind database. The figure which shows typically the apparatus used for the experiment example. The figure which shows typically the front end by the side of the opening part of the tube used for the experiment example. The figure which shows an experimental result. Sectional drawing which shows the front end by the side of the opening part of the tube concerning a modification. Sectional drawing which shows the front end by the side of the opening part of the tube concerning a modification.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Printing apparatus, 110 Storage part, 112 types database, 120 Communication part, 130 Printing control part, 140 Printing part, 150 Conveyance mechanism, 160 Printing recording medium holding part, 170 Printing recording medium, 200 Printing method determination apparatus, 220 Porosity evaluation unit, 221 pressure sensor, 222 stage, 224 tube, 225 opening, 226 pressure device, 228 pressing unit, 229 control unit, 230 recording medium identification unit, 240 printing method determination unit

Claims (14)

A porosity evaluation unit for evaluating the porosity of the recording medium for printing;
Based on the evaluation value evaluated by the porosity evaluation unit, a printing method determination unit that determines a printing method of the recording medium for printing,
Including
The porosity evaluation unit includes said print recording medium of the printing surface pressurizing pressure device from the opening, and a pressure sensor for detecting the pressure inside of the pressure device,
The printing method determining apparatus, wherein the pressurizing device pressurizes the printing surface, and the porosity evaluation unit evaluates the porosity based on the pressure detected by the pressure sensor. In claim 1,
Based on the evaluation value evaluated by the porosity evaluation unit, further includes a recording medium identification unit for identifying the type of the recording medium for printing,
The printing method determination device, wherein the printing method determination unit determines the printing method corresponding to the type of the recording medium for printing identified by the recording medium identification unit as a printing method for the recording medium for printing. In claim 1 or 2,
The printing method determining apparatus further includes a pressing unit that presses the opening against a printing surface of the printing recording medium. In claim 3,
A stage for placing the recording medium for printing;
The printing method determining apparatus, wherein the pressing unit presses the opening from above on a printing surface of the printing recording medium placed on the stage. In any of claims 1 to 4,
The void ratio evaluation unit is configured to determine the gap based on a pressure value in the pressure device after a predetermined period of time has elapsed since the opening of the pressure device is brought into close contact with the recording medium for printing and pressurization is started. Printing method determination device that evaluates the rate. In claim 5,
The elapsed time from when the opening of the pressurizing device is brought into close contact with the printing recording medium to start pressurization until the rate of change of the pressure value in the pressurizing device becomes a predetermined value or less is the predetermined period. A printing method determining apparatus further including a period determining unit that is determined in advance as In any one of Claims 1 thru | or 6.
The porosity evaluation unit determines the porosity based on an attenuation rate at which the pressure value attenuates from the highest pressure value after the pressurizing device pressurizes the printing surface of the printing recording medium. A printing method determination device to be evaluated. In any of claims 1 to 4,
The void ratio evaluation unit presses the pressurizing device in close contact with the printing recording medium until the rate of change of the pressure value in the pressurizing device becomes a predetermined value or less. A printing method determination apparatus that evaluates time as the porosity. In any of claims 1 to 4,
The porosity evaluation unit is configured to apply pressure when the opening of the pressurizing device is in close contact with the recording medium for printing, and the rate of change of the pressure value in the pressurizing device becomes a predetermined value or less. A printing method determination apparatus that evaluates a pressure value as the porosity. In any one of Claim 1 thru | or 9,
The printing method determining unit is a printing method determining device that determines a dot diameter of an ink as a printing method used for the printing recording medium based on the evaluation value evaluated by the porosity evaluation unit. In any one of Claims 1 thru | or 10,
The printing method determining unit is a printing method determining device that determines a dot density of ink as a printing method used for the recording medium for printing based on the evaluation value evaluated by the porosity evaluation unit. In any one of Claims 1 thru | or 11,
The printing method determination device, wherein the printing method determination unit determines a printing timing as a printing method used for the printing recording medium based on the evaluation value evaluated by the porosity evaluation unit. A printing method determination device according to any one of claims 1 to 12,
Using the printing method determined by the printing method determination device, a printing unit that prints on the recording medium for printing;
Including a printing device. A method for determining a printing method using a printing method determination device including a pressure device that pressurizes a printing surface of the recording medium for printing from an opening, and a pressure sensor that detects a pressure inside the pressure device. And
The pressure device pressurizes the printing surface, and evaluates the porosity of the recording medium for printing based on the pressure detected by the pressure sensor;
A method for determining a printing method, wherein a printing method for the printing recording medium is determined based on the evaluated evaluation value.

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