JPH07104954A - Printer and control method therefor - Google Patents

Abstract

PURPOSE:To automatically select an optical emulator according to inputted print data, and to elucidate the selected result to a user. CONSTITUTION:Print data inputted from a host computer 100 are held in an input data buffer 18b. When the print data held in the input data buffer 18b reach a certain constant data amount, or the input of the print data is absent in more than a fixed time, the inputted print data are transferred to an emulator analyzing part. The emulator analyzing part analyzes and discriminates the received print data, and selects the optimal emulator from among the plural emulators which can be used at present. When the optimal emulator is selected, the designation of the emulator is displayed on a display 1501a. Also, when the print data are not suitable to any emulator, an error message is displayed on the display 1501a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printer and its control method.

[0002]

2. Description of the Related Art Conventionally, a printer is often connected to a host computer or the like on a one-to-one basis, but due to the recent spread of networks and the like, the number of printers connected to a plurality of host computers is increasing. There is. Therefore, there are many cases in which the code systems of print data transmitted from a plurality of host computers are different from each other. Therefore, the printer has a plurality of emulators, and the user selects one of these emulators that is suitable for the print data to be processed and performs printing. There is also proposed a printer having a function of automatically selecting a code system from input print data.

Further, as described above, since a plurality of host computers share a printer, the paper size designated by the input print data often differs from the currently printable paper. There is. In such a case, the conventional printer displays an error message and prompts the user to replace the paper cassette.

[0004]

In the conventional printer as described above, the types of print data that can be handled are limited, and the troublesome emulator switching work is required. Even if the printer can automatically select the emulator, the user cannot know the emulator that is currently selected, and the only way to judge whether the emulator is selected properly is to check the printed matter. There is a problem that there is no.

In the conventional printer described above, for example, when the first print data is input and the second print data is input in the printer connected to the network, the first print data is prepared. When the print data is different from the print data, the buffer of the print data is not cleared and the second print data is printed unless the printing of the first print data is completed by replacing the paper cassette or the error skip procedure is performed. There is a problem that you can not.

As described above, in the conventional printer, the burden imposed on the user is large, and thus the usability is poor. Such a problem becomes particularly noticeable when a plurality of host computers and printers are connected by a network or the like.

The present invention has been made in view of the above problems, and an object thereof is to provide a printer and a printer control method which are easy to use.

That is, it is a first object of the present invention to provide a printer and a printer control method capable of automatically selecting an optimum emulator from input print data and clearly showing the selection result to the user. To do.

Further, when the paper size designated by the print data is not a printable paper size, it is possible to automatically perform linear density conversion to convert to a printable paper size before printing. A second object is to provide a printer control method.

[0010]

The printer of the present invention for achieving the above first object has the following configuration. That is, in a printer equipped with a plurality of emulators, a selection unit that automatically selects an appropriate emulator from the plurality of emulators based on print data input from an external device, and an emulator selected by the selection unit. The printing device further includes a processing unit that processes the print data, and a notification unit that notifies the result of the selection made by the selection unit.

Further, a printer control method of the present invention for achieving the above-mentioned first object is a method of controlling a printer having a plurality of emulators, wherein the plurality of printers are controlled based on print data input from an external device. A selection step of automatically selecting an appropriate emulator from the emulator, a processing step of processing the print data by the emulator selected in the selection step, and a notification step of notifying a result of the selection by the selection step. It is characterized by that.

Further, the printer of the present invention for achieving the above second object has the following configuration. That is, a printer for recording and outputting based on print data input from an external device, and determining means for determining whether or not the paper size designated by the print data is the paper size included in the printer, When the determination unit determines that the paper size is not included in the printer, the conversion unit that converts the image data obtained based on the print data into a size recordable in the paper size included in the printer, Recording means for performing recording by the image data converted by the converting means.

Further, a printer control method of the present invention for achieving the above second object is a printer control method for recording and outputting based on print data input from an external device, which is designated by the print data. A judgment step of judging whether the determined paper size is a paper size included in the printer control method, and the print data if the judgment step determines that the paper size is not included in the printer control method. A conversion step of converting the image data obtained based on the above into a size recordable to the paper size included in the printer control method, and a recording step of executing recording with the image data converted by the conversion step.

[0014]

With the above configuration, based on the print data input from the external device, an appropriate emulator for processing this print data is selected from the plurality of emulators provided in the printer, and the result of this selection is selected. Is notified to the user.

According to another configuration, when the paper size designated by the print data input from the external device is different from the paper size provided in the printer, the image data obtained from the print data is used as the printer data. Recording is performed by converting to the printable size with the paper size included in.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

<Embodiment 1> Before explaining the construction of this embodiment, the construction of a laser beam printer and an inkjet printer to which this embodiment can be applied will be described with reference to FIGS. The printer to which this embodiment is applicable is not limited to these laser beam printers and inkjet printers, and printers of other printing methods may be applied.

[Description of Laser Beam Printer] First, the configuration of a laser beam printer to which this embodiment can be applied will be described with reference to FIG. FIG. 1 is a cross-sectional view showing the internal structure of a laser beam printer (hereinafter abbreviated as LBP) according to the present embodiment. This LBP is for registering character patterns and affiliated forms (form data 9) from a data source (not shown). Can be done.

In the figure, reference numeral 1500 denotes an LBP main body, which inputs and stores print information (character code or the like) supplied from an externally connected host computer, form information, macro commands, and the like. A corresponding bitmap image such as a character pattern or a form pattern is created according to the above, and an image is formed on a recording paper which is a recording medium. Reference numeral 1501 denotes an operation panel on which switches for operation and an LED display are arranged.
A printer control unit 00 controls the entire LBP 1500 and analyzes character information and the like supplied from the host computer. The printer control unit 1000 mainly converts character information into a video signal of a corresponding character pattern and outputs it to the laser driver 1502.

The laser driver 1502 is the semiconductor laser 1
A circuit for driving 503, which switches on / off a laser beam 1504 emitted from a semiconductor laser 1503 according to an input video signal. The laser beam 1504 is oscillated in the left-right direction by the rotating polygon mirror 1505 to scan and expose the electrostatic drum 1506. As a result, an electrostatic latent image having a character pattern is formed on the electrostatic drum 1506. This latent image is developed by a developing unit 1507 arranged around the electrostatic drum 1506 and then transferred to a recording paper. A cut sheet is used as the recording sheet, and the cut sheet recording sheet is stored in a sheet cassette 1508 mounted on the LBP 1500, and the sheet feeding roller 150
9 and the conveying rollers 1510 and 1511 take in the apparatus and supply the electrostatic drum 1506.

[Description of Inkjet Printer] FIG. 2
Is an inkjet recording apparatus (IJ
It is a general view of RA).

In the figure, the lead screw 5005
Rotates via the driving force transmission gears 5011 and 5009 in association with the forward and reverse rotations of the drive motor 5013. The carriage HC has a spiral groove 5004 of the lead screw 5005.
Has a pin (not shown) that engages with, and is reciprocated in the directions of arrows a and b with the rotation of the lead screw 5005. An inkjet cartridge IJC is mounted on the carriage HC. A paper pressing plate 5002 presses the paper against the platen 5000 in the moving direction of the carriage. Reference numerals 5007 and 5008 denote photocouplers, which function as home position detection means for confirming the presence of the carriage lever 5006 in this area and switching the rotation direction of the motor 5013. Reference numeral 5016 is a member that supports a cap member 5022 that caps the front surface of the recording head.
The suction recovery of the recording head is performed via. A cleaning blade 5017 can be moved in the front-rear direction by a member 5019. Reference numeral 5018 denotes a main body support plate that supports the cleaning blade 5017 and the member 5019. Needless to say, the cleaning blade 5017 is not limited to this form and a known cleaning blade can be applied to this example. Reference numeral 5012 denotes a lever for starting suction for suction recovery, which moves in accordance with the movement of the cam 5020 that engages with the carriage, and the driving force from the drive motor is movement-controlled by a known transmission means such as clutch switching. .

The capping, cleaning, and suction recovery are configured so that the desired processing can be performed at their corresponding positions by the action of the lead screw 5005 when the carriage comes to the area on the home position side. The configuration is not limited to this, and may be configured to perform a desired operation at a known timing.

Next, a control configuration for executing the recording control of the above-mentioned apparatus will be described with reference to the block diagram shown in FIG.

In the figure showing the control circuit, 1700 is an interface for inputting a recording signal, and 1701 is an MP.
U and 1702 are program ROMs for storing control programs executed by the MPU 1701, and 1703 is a dynamic RAM (DRAM) for storing various data (the above-mentioned recording signals and print data supplied to the head). A gate array 1704 controls print data supply to the recording head 1708, and also controls data transfer between the interface 1700, the MPU 1701, and the DRAM 1703. 1710 is the recording head 17 described above.
08 is a carrier motor for carrying, and 1709 is a carrying motor for carrying the recording paper. Reference numeral 1705 denotes a head driver for driving the recording head, and 1706 and 1707 are motor drivers for driving the carry motor 1709 and the carrier motor 1710, respectively.

In each of the recording devices thus configured, when a recording signal is input from the host computer via the interface 1700, the gate array 170
4 and the MPU 1701 convert the recording signal into print data for printing. Then, the motor driver 170
6, 1707 are driven, and the head driver 1
The recording head is driven according to the print data sent to 705, and printing is executed.

FIG. 4 is a block diagram for explaining the arrangement of the printer control system according to the first embodiment. A laser beam printer will be described here as an example.

In FIG. 4, reference numeral 100 denotes a host computer, which is provided with a CPU 1 for executing document processing in which graphics, images, characters, tables and the like are mixed based on a document processing program stored in ROM 2, and is connected to a system bus 4. Control each device to be comprehensively controlled.

A RAM 3 is a main memory of the CPU 1,
Functions as a work area. A keyboard controller (KBC) 5 controls key input from the keyboard 9. A CRT controller (CRTC) 6 controls the display of a CRT display (CRT) 10. A disk controller (DKC) 7 includes a hard disk (HD) 11 for storing a boot program, various applications, font data, user files, edit files, etc., and a floppy disk (FD) 1.
2 access control. Reference numeral 8 denotes a printer controller (PRTC), which is connected to the printer 1500 via a predetermined interface 13 and is connected to the printer 1500.
And communication control processing with.

The CPU 1 executes, for example, outline font rasterization processing on the RAM 3 according to display information set on the RAM 3, and WYSIWYG (What You See Is What You get) on the CRT 10.
May be possible. Further, the CPU 1 may be configured to open various windows registered based on a command designated by a mouse cursor or the like on the CRT 10 and execute various data processing. Further, the document processing program or the like may be stored in the hard disk 11 or the floppy disk 12, and may be configured to be loaded into the RAM 3 via the DKC 7 and executed at the time of execution.

Next, the control configuration of the printer 1500 will be described.

In the printer 1500, 14 is a printer CPU, which generally controls access to various devices connected to the system bus 17 based on a control program stored in the ROM 15, and through a printing unit interface 19. The image signal VDO as the print data is output to the printing unit (printer engine) 20 connected to the printer. Reference numeral 16 denotes a RAM, which is used for the work area of the CPU 14, storage of recording information, and the like. The RAM 16 may be configured so that the memory capacity can be expanded by an optional RAM connected to an expansion port (not shown). The print unit interface 19 is a unit that converts print data into a form that matches the mechanism of the print unit 20 and outputs the print data. For example, the print unit interface 19 performs processing such as converting parallel data into serial data.

Further, the ROM 15 may store a plurality of dot font data groups having different sizes as printer fonts. Further, in the ROM 15, a bitmap expansion process (for example, a process of expanding an outline font, vector graphics data into a rasterization area of the RAM 16 in a bitmap) assigned by the host computer 100 is executed in parallel with the rasterization process on the host computer 100. A rasterization program for processing is stored.

As a result, the rasterization sharing processing ratio is dynamically switched according to the analysis result of the rasterization information in the output information output from the host computer 100 to the printer 1500. Depending on the analysis result of the rasterization information, either the printer 1500 or the host computer 100 may perform the rasterization process.

Further, at least one or more card slots (not shown) may be provided so that an optional font card and a control card (emulation card) different from the built-in language system can be connected in addition to the built-in font. Further, an NVRAM for storing printer mode setting information from an operation unit (not shown) may be provided.

Next, the operation of this embodiment will be described.

FIG. 5 is a block diagram showing the functional arrangement of the printer according to the first embodiment. In the figure, an input unit 18 includes an input interface 18a and an input data buffer 18
b. The print data input from the host computer 100 is sequentially stored in the input data buffer 18b via the input interface 18a. In addition to the printer control program for controlling the entire printer, the ROM 15 stores a program having a function as an emulator analysis unit and a plurality of emulators (emulators A and B in FIG. 5). The RAM 16 has a print data buffer 16a, which stores image data obtained by expanding the print data. The image data stored in the print data buffer 16a is printed by the printing unit I / F.
It is transferred to the printing unit 20 via the and is recorded on the recording medium by the laser beam method. The operation panel 1501 has a display 1501a, on which the result of analysis by the emulator analysis unit described above is displayed.

FIG. 6 is a flow chart showing the operation procedure of the first embodiment, and this program is stored in the ROM 15.

The print data input from the host computer 100 is held in the input data buffer 18b (steps S10 and S11). When the print data held in the input data buffer 18b reaches a certain amount of data or when the print data is not input for a certain time or more, the input print data is passed to the emulator analysis unit. The emulator analysis unit analyzes and discriminates the received print data, and selects the optimum one from a plurality of currently available emulators (step S12).

Here, an example of a method of discriminating the emulator to be used will be described. For example, the emulator analyzer selects a suitable emulator by referring to control commands, parameters, etc. included in the print data divided into fixed sizes such as 1 KByte in the input data buffer 18b.

When the most suitable emulator is selected,
The name of the emulator is displayed on the display 1501a. If the print data does not match any emulator, an error message is displayed on the display 150.
1a is displayed (step S12).

When the most suitable emulator is selected,
The process proceeds from step S14 to step S15, and the development into image data is executed by the selected emulator. Then, the expanded image data is stored in the print data buffer 16a (step S16). Then, the image data is transferred to the printing unit 20, and printing on the recording medium is executed (step S17).

On the other hand, if the emulator is not selected, the process proceeds from step S14 to step S18, where a print cancel command is output to the host computer, and this process ends.

As described above, according to the first embodiment, in a printer equipped with a plurality of emulators,
Since the most suitable emulator for the input print data is automatically selected, troublesome emulator switching work is unnecessary. Also, if an error occurs during emulator selection, a message to that effect is displayed on the display, and a print cancel command is sent to the host computer, so meaningless printing is prevented and an error is given to the user. It is easy to understand the situation.

In the first embodiment, the display provided in the printer 1500 is used to display the selection result of the emulator, but it goes without saying that it may be configured to be displayed on the display on the host computer.

<Second Embodiment> Next, a second embodiment will be described. When the paper size specified by the print data is different from the printable paper size that the printer currently has, the printer according to the second embodiment performs linear density conversion processing to convert the paper size into a printable paper size. Is printed out. FIG. 10 is a diagram for explaining the operation of the second embodiment. For example, the print data sent from the host computer specifies the paper size "A4",
When the paper sizes included in the printer are “A3” and “B5”, the image data generated from the print data is subjected to linear density conversion processing, and printing is performed with the paper size “B5”. The second embodiment is also applicable to a laser beam printer, an inkjet printer, and other types of printers, as in the first embodiment. The control configuration is also the same as that of the first embodiment (FIG. 4), and the description is omitted here.

FIG. 7 is a block diagram showing the functional arrangement of the printer of the second embodiment. However, in the configuration having the same function as in FIG. 5 described above, the same reference numerals are given and the description thereof is omitted here. The ROM 15 'includes a program for executing the functions of a paper size determining unit and a linear density conversion processing unit described later.

FIG. 8 is a flow chart for explaining the operation procedure of the printer of the second embodiment. The control program for realizing the control shown in this flowchart is a ROM.
It is stored in 15 '. The print data input from the host computer 100 is stored in the input data buffer 18b (step S21). Then, a parameter relating to the paper size is detected from the input print data (step S22). Here, based on the detected parameters, it is checked whether or not the specified paper size matches the paper size currently provided in the printer (step S23). Then, if they match (that is, if printing is possible with the designated paper size), the process proceeds to step S24,
After expanding the image data as usual, the printing process is executed (step S25).

On the other hand, in step S23, if they do not match (that is, if the printer does not have the designated paper size), the process proceeds to step S26. Step S2
At 6, the print data is expanded into bitmap data. Then, in step S27, the paper size determination unit of the ROM 15 'determines the paper size to be used, and the linear density conversion unit performs linear density conversion processing on the obtained bitmap data. By this linear density conversion processing, the bitmap data obtained from the print data is converted into bitmap data suitable for the paper size of the printer. Then, in step S25, the printing process is executed.

Next, the above-mentioned linear density conversion processing will be described. In this embodiment, as an example of the linear density conversion processing, an example in which the bitmap image data is enlarged or reduced by a simple algorithm will be described.

FIG. 9 is a flow chart showing the procedure of the linear density conversion processing stored in the ROM 15 'in the second embodiment. As described above, when the paper size included in the input print data is different from the paper size prepared in the printer, the linear density conversion processing by this algorithm is called and executed.

First, the enlargement ratio N is calculated from the paper size designated by the print data and the paper size of the printer (step S31). Here, assuming that the designated paper size is 100, the process is branched so that the enlarging process is executed when N is larger than 100 and the reducing process is executed when N is smaller than 100 (step S32). When the printer has a plurality of paper sizes, the enlargement ratio N is calculated for each paper size, and the paper size that is the closest to 100 is used. That is, the paper having the size closest to the designated paper size is selected. In order to select the paper size closest to the specified paper size, the alternative paper size is owned in advance in the form of a table, etc., and the paper size is determined by referring to this table. May be.

When the enlargement process is selected in step S32, the process proceeds to step S33. In the enlargement routine, if the enlargement ratio N is 120, for example, 100: 120 = 5: 6, and the enlarged bitmap data is added by adding 1 dot for every 5 dots to the vertical and horizontal directions of the original print data. create. The dots added here are
The value for every 5th dot is used as it is.

On the other hand, when the reduction processing is selected in step S32, the process proceeds to step S34. In the reduction routine, for example, if the enlargement ratio N is 80, 100: 80 =
It becomes 5: 4, and the values for every 5th dot are thinned out for each of the vertical and horizontal directions of the original print data.

As described above, bitmap data enlarged or reduced according to the enlargement ratio can be obtained. Then, in step S25 described above, the printing process using the bitmap data is executed.

As described above, according to the printer of the second embodiment, even if the printer does not have the paper size designated by the input print data, the linear density conversion process is performed on the bitmap data. Printing is performed in conformity with the paper size of the printer. Therefore, for example, when the print data of A and B is input to the printer and the print data A specifies a size other than the paper size of the printer, the print data A is subjected to the linear density conversion processing. Printing is executed. Therefore, the print data B is continuously printed without performing an error skip or the like on the print data A, so that the operability is improved.

Further, since the linear density conversion processing is performed, even if the size of the paper to be recorded is smaller than the paper size designated by the print data, it is possible to prevent the edge portion of the print image from being lost.

In the above embodiment, as the linear density conversion processing, a method of simply interpolating with the immediately preceding dot or a method of simply thinning out the dots is used. Therefore, image information is lost and an image is output. The result can be different than desired. In order to prevent such problems,
It goes without saying that any known scaling conversion having a bit map interpolation function or the like may be used for the linear density conversion processing.

When a plurality of paper sizes can be selected on the printer side in the situation where the linear density conversion process occurs, in the second embodiment, the paper size closest to the designated paper size is selected. The maximum magnification N is 100
Although the paper size close to is selected, it is not limited to this. For example, the most frequently used paper size may be selected in advance, and the paper size may be converted to that size. As a method for realizing this, for example, the paper size of the paper cassette set at the top is preferentially selected. In addition, when selecting from a plurality of paper sizes included in the printer, it is possible to specify a mode in which priority is given to enlargement or reduction.

As described above, according to each of the above-described embodiments, a printer having improved operability is provided, and particularly when connected to a plurality of host computers via a network or the like, the operability is remarkably improved.

The present invention may be applied to a system composed of a plurality of devices or an apparatus composed of a single device. Further, it goes without saying that the present invention can also be applied to a case where it is achieved by supplying a program that causes a system or an apparatus to execute the processing defined by the present invention.

[0062]

As described above, according to the present invention, the optimum emulator can be automatically selected from the input print data and the selection result can be clearly shown to the user. Therefore, the user can easily recognize by which emulator the print data currently being processed is processed.

Further, according to another configuration, when the paper size designated by the print data is not the printable paper size, the linear density conversion is automatically performed to convert the printable paper size to the printing. It becomes possible to do. For this reason, the printing process is executed without waiting for the replacement of the paper cassette, the error skipping, or the like, and the operational burden on the user is reduced.

[0064]

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing the internal structure of a laser beam printer of this embodiment.

FIG. 2 is a schematic view of an inkjet recording apparatus (IJRA) to which the present invention can be applied.

FIG. 3 is a block diagram showing a control configuration for executing recording control of the inkjet recording apparatus of FIG.

FIG. 4 is a block diagram showing a configuration of a printer control system in this embodiment.

FIG. 5 is a block diagram illustrating a functional configuration of the printer according to the first exemplary embodiment.

FIG. 6 is a flowchart showing an operation procedure of the first embodiment.

FIG. 7 is a block diagram illustrating a functional configuration of a printer according to a second exemplary embodiment.

FIG. 8 is a flowchart illustrating an operation procedure of the printer according to the second exemplary embodiment.

FIG. 9 is a flowchart illustrating a procedure of linear density conversion processing according to the second exemplary embodiment.

FIG. 10 is a diagram illustrating an operation outline of the second embodiment.

[Explanation of symbols]

 14 CPU 15 ROM 16 RAM 16a Print data buffer 18 Input section 18a Input interface 18b Input data buffer 19 Printing section I / F 20 Printing section 100 Host computer 1500 Laser beam printer

Claims (12)

[Claims] 1. A printer equipped with a plurality of emulators, comprising: selecting means for automatically selecting a suitable emulator from the plurality of emulators based on print data input from an external device; A printer comprising: a processing unit that processes the print data by the emulator; and a notification unit that notifies a result of the selection made by the selection unit. 2. The printer according to claim 1, wherein the notification unit displays a result of selection by the selection unit on a display device included in the printer. 3. The printer according to claim 1, further comprising a transmission unit that transmits information to that effect to the external device when an appropriate emulator is not selected by the selection unit. 4. A printer for recording and outputting on the basis of print data input from an external device, and determining whether the paper size specified by the print data is the paper size of the printer. And a conversion unit that converts the image data obtained based on the print data into a size that can be recorded in the paper size of the printer when the determination unit determines that the paper size is not included in the printer. And a recording unit that executes recording using the image data converted by the conversion unit. 5. When the determination unit determines that the paper size is not included in the printer, the paper size closest to the paper size designated by the print data is selected from the paper sizes included in the printer. 5. The printer according to claim 4, further comprising a selection unit for selecting, wherein the conversion unit converts image data obtained based on print data into a paper size selected by the selection unit. 6. A selection means for selecting a paper size of a paper cassette set at a predetermined position among the paper sizes of the printer when the judgment means determines that the paper size is not included in the printer. 5. The printer according to claim 4, further comprising: the converting unit converting the image data obtained based on the print data into the paper size selected by the selecting unit. 7. A method of controlling a printer having a plurality of emulators, comprising: a selecting step of automatically selecting an appropriate emulator from the plurality of emulators based on print data input from an external device; and the selecting step. A printer control method comprising: a processing step of processing the print data by an emulator selected by the above; and a notification step of notifying a result of the selection by the selection step. 8. The printer control method according to claim 7, wherein the notification step displays the result of the selection made by the selection step on a display device of the printer. 9. The printer control method according to claim 7, further comprising a transmission step of transmitting information to that effect to the external device when an appropriate emulator is not selected in the selection step. 10. A printer control method for recording and outputting based on print data input from an external device, wherein the paper size designated by the print data is a paper size included in the printer control method. And the determination step determines that the paper size is not included in the printer control method, the image data obtained based on the print data is recorded in the paper size included in the printer control method. A printer control method comprising: a conversion step of converting to a possible size; and a recording step of executing recording with the image data converted by the conversion step. 11. When the determination step determines that the sheet size is not included in the printer control method, the size closest to the sheet size specified by the print data among the sheet sizes included in the printer control method. 11. The method according to claim 10, further comprising a selection step of selecting the paper size of, wherein the conversion step converts the image data obtained based on the print data into the paper size selected by the selection step. Printer control method. 12. When the determination step determines that the sheet size is not included in the printer control method, the sheet size of the sheet cassette set in a predetermined position among the sheet sizes included in the printer control method is determined. 12. The printer control method according to claim 11, further comprising a selecting step of selecting, wherein the converting step converts the image data obtained based on the print data into the paper size selected by the selecting step.