JPH11179973A - Printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To print a paper by automatically selecting between rapid perfecting printing control and slow-speed perfecting printing control in accordance with a designation to switch a paper feed inlet. SOLUTION: This printing device is equipped with a switching process means 22a which switches a printing sequence in compliance with a selection between the low-speed perfecting printing mode to print a second paper after printing both sides of a first paper and the rapid perfecting printing mode to print a second paper and following papers while printing one of the faces and the other face of the first paper, and plural paper feed apertures, at least, one of which can perform only the low-speed perfecting printing. The switching process means 22a switches the printing sequence to rapidly printing the both sides of the paper, when the rapid doubleside printing is acceptable, in accordance with information on the paper feed inlet based on data pertaining to printing environments.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printer for performing double-sided printing on paper.

[0002]

2. Description of the Related Art FIG. 5 is a block diagram of a conventional apparatus, and FIG.
Is a flowchart of a conventional double-sided printing process. Less than,
This will be described with reference to FIGS. (1): Description of Apparatus Configuration In FIG. 5, the printer apparatus includes a printer control unit 2 for receiving print data from a host 1, a mechanical (engine) unit 3 as a printing mechanism, and a printing unit 4 for printing on paper. is there.

The printer control section 2 includes a data analysis processing section 21, a print schedule section 22, a registration queue 23, a mechanical control section 24, a print processing section 25, and a print queue 26.

[0004] The data analysis processing unit 21 analyzes data transmitted from the host 1 and creates print page memory data (bitmap memory data). The print schedule unit 22 determines a print schedule such as a print order from input information (paper size, paper feed port, etc.) for performing printing.

The registration queue 23 stores print input information, and can store a plurality of pages. The mechanical control unit 24 controls the mechanical unit 3 in response to a request from the print schedule unit 22. The print processing unit 25 performs print processing in the mechanical unit 3 in response to a print request from the print schedule unit 22. Print queue 2
Reference numeral 6 denotes a memory for storing the pointers of the registration queue 23 in the order in which the print request is issued to the print processing unit 25.

(2): Description of print control processing The data analysis processing section 21 analyzes data transmitted from the host 1 and creates print page memory data (bitmap memory data). When the print page memory data is created, a print request is output to the print schedule unit 22. When the print schedule unit 22 recognizes the print request, it receives input information (paper size, paper feed port, etc.) necessary for printing. Then, the print schedule unit 22 stores the print input information in the registration queue 23.

After storing the print input information in the registration queue 23, the print schedule unit 22 stores the pointers stored in the registration queue 23 in the print queue 26 in the order of requesting the print processing unit 25 for a print request. Then, the print schedule unit 22 sends the mechanical control unit 2 according to the print input information.
4 to the print processing unit 2 or the like.
5 and outputs a print request request.

[0008] The print schedule unit 22 includes a print queue 2
6 stores the pointers of three or more registration queues 23, the print queues 2 for high-speed double-sided printing unconditionally.
6 is replaced. The process of exchanging the print queue 26 for high-speed double-sided printing means that two sheets of printing are alternately printed on both sides, that is, after the first backside printing is performed, the printed paper is evacuated in a double-sided printing pass, This is a process of rearranging the order of the print request request output for printing the second back side and then discharging the evacuated sheet.

A print schedule unit 2 for high-speed double-sided printing
2, the storage order of the print queue 26 is changed to the back side of the first sheet,
The printing order control such as the back side of the first sheet, the front side of the first sheet, the front side of the second sheet, or the back side of the third sheet (when the third print mail is stored in the registration queue 23) has been performed.

[0010] The print schedule unit 22 discriminates printing on the front and back sides based on the front and back information of the print input information transmitted from the data analysis processing unit 21 and stored in the registration queue 23. In the case of the back side, after the printing is completed, the paper is reversed by the mechanical unit 3 and printed on the paper at the paper retreat position in the double-sided printing mechanism (for example, Japanese Patent Application Laid-Open No. Hei 6-2405).
No. 0).

A conventional print control process will be described below with reference to steps S21 to S28 in FIG. S21: The data analysis processing unit 21 analyzes the data transmitted from the host 1, creates bitmap memory data, stores it in the bitmap memory BMM, and proceeds to processing S22.

S22: The data analysis processing section 21 outputs a print request to the print schedule section 22, and proceeds to processing S23. S23: The print schedule unit 22 stores the print input information in the registration queue 23, stores the pointer stored in the registration queue 23 in the print queue 26 in the order of requesting the print processing unit 25 for a print request, and proceeds to step S24. Move on.

S24: The print schedule unit 22 exchanges the print queue 26 for high-speed double-sided printing.
Move to processing S25. S25: The print schedule unit 22 registers the replacement processing of the print queue 26 in the print queue 26, and proceeds to processing S26.

S26: The print schedule unit 22 determines whether or not the pointer for performing the replacement process is in the print queue 26. If it is determined in this determination that the pointer for performing the replacement process is in the print queue 26, the process returns to step S24; otherwise, the process proceeds to step S27.

S27: The print schedule unit 22 outputs a print request request to the print processing unit 25, and proceeds to processing S28. S28: The print processing unit 25 performs a print process in the mechanical unit 3.

[0016]

The above-mentioned prior art has the following problems. : A problem occurred due to a change in the printer specification. That is, the types of paper sizes that can be printed have been expanded (increased) due to changes in the printer device specifications, but some paper sizes do not allow high-speed duplex printing control (for example, small sizes such as large sizes and postcards). Further, the paper feed port is roughly classified into two types: printing from a cassette paper feeding and printing from a paper feeding tray. However, printing from a paper feeding tray is a device specification in which high-speed double-sided printing control cannot be performed. For this reason, when printing is performed under the high-speed double-sided printing control under the printing conditions in which the high-speed double-sided printing control cannot be performed, a paper jam occurs. Therefore, there has been a problem that it is necessary to switch between high-speed double-sided printing control and normal low-speed double-sided printing control in accordance with printing conditions.

In order to perform high-speed double-sided printing control, three or more print data (for three pages) are required in the print queue 26 of the print schedule unit 22. If there are three or more print data at the time of registration in the print queue 26, the printing order is switched for high-speed double-sided printing, but printing must wait until three or more print data is received. . Therefore, there has been a problem that the printing processing speed is reduced.

The present invention solves such a conventional problem, and a plurality of print data transmitted from a host are mixed.
When switching the paper feed port or paper size is specified, switching between high-speed double-sided printing control and low-speed double-sided printing control is performed accordingly. It is an object of the present invention to eliminate the need to wait for data to be stored in a plurality of print queues.

[0019]

FIG. 1 is a diagram illustrating the principle of the present invention. In FIG. 1, 1 is a host, 2 is a printer control unit,
3 is a mechanical unit, 22a is a replacement processing unit, 23 is a registration queue, 26 is a print queue, and 25a is a print processing unit.

The present invention is configured as follows to solve the above-mentioned conventional problems. (1) Low-speed double-sided printing in which the first sheet is printed on both sides after printing on both sides, and high-speed double-sided printing in which the second and subsequent sheets are printed between the first and second sides of the first sheet. Correspondingly, a switching processing means 22a for changing the printing order, and at least one paper feeding port is provided with a plurality of paper feeding ports capable of performing only the low-speed double-sided printing. If the high-speed double-sided printing is possible according to the paper mouth information, the printing order is changed, and the high-speed double-sided printing is performed.

(2) Low-speed double-sided printing for printing the second sheet after printing on both sides of the first sheet, and high-speed printing for printing the second and subsequent sheets between printing on one side and the other side of the first sheet The image processing apparatus includes a replacement processing unit 22a for replacing a printing order corresponding to double-sided printing, and a plurality of sizes of at least one paper size capable of performing only the low-speed double-sided printing. If the high-speed double-sided printing is possible according to the paper size information, the printing order is switched, and the high-speed double-sided printing is performed.

(3) Low-speed double-sided printing for printing the second sheet after printing on both sides of the first sheet, and high-speed printing for printing the second and subsequent sheets between printing on the first and second sides of the first sheet Switching processing means 22a for changing the printing order corresponding to double-sided printing; a plurality of paper-feeding ports in which at least one paper-feeding port is capable of only the low-speed double-sided printing; The paper exchange processing means 22a includes a plurality of sizes of paper capable of performing the above-described processing, and the exchange processing unit 22a performs an exchange processing of a printing order when the high-speed double-sided printing is possible by using a paper supply port and paper size information of printing environment information. Perform high-speed double-sided printing.

(4) Low-speed double-sided printing for printing the second sheet after printing on both sides of the first sheet, and high-speed printing for printing the second and subsequent sheets between the printing on one side and the other side of the first sheet The image processing apparatus includes a switching processing unit 22a for switching the printing order corresponding to double-sided printing, and a timer for setting a time from printing of one side to printing of the other side. According to the front and back information, the timer is started when double-sided printing is started, and if the next print data is received within the timer time, the print order corresponding to high-speed double-sided printing is switched, and the high-speed double-sided printing is performed. I do.

(Operation) The operation based on the above configuration will be described. When high-speed double-sided printing can be performed by the replacement processing unit 22a based on the paper feed port information of the printing environment information, the printing order is switched and high-speed double-sided printing is performed. Therefore, printing can be automatically performed by switching between low-speed double-sided printing and high-speed double-sided printing based on the paper feed port information.

If high-speed double-sided printing can be performed by the replacement processing means 22a based on the paper size information of the printing environment information, the printing order is replaced and high-speed double-sided printing is performed. Therefore, printing can be automatically performed by switching between low-speed double-sided printing and high-speed double-sided printing based on the paper size information.

Further, if high-speed double-sided printing can be performed by the replacement processing means 22a based on the paper feed port and paper size information of the printing environment information, the printing order is replaced and high-speed double-sided printing is performed. For this reason, printing can be automatically performed by switching between low-speed double-sided printing and high-speed double-sided printing based on the paper feed port and paper size information.

Also, the timer sets the time from the printing of one side to the printing of the other side, and the switching processing means 22a uses the front and back information for the double-sided printing of the printing environment information to start the timer when starting the double-sided printing. Is started, and if the next print data is received within the timer period, the process of changing the printing order corresponding to the high-speed double-sided printing is performed, and the high-speed double-sided printing is performed.
Therefore, when performing high-speed double-sided printing, there is no need to wait for print data to be stored in the multiple print queue 26.

[0028]

DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the present invention, a print schedule section refers to print input information before performing replacement processing when pointers of a plurality of registration queues are stored in a print queue, and sets conditions for high-speed double-sided printing. Is satisfied, a print queue exchange process for high-speed double-sided printing control is performed.

Further, a timer is started when the back side printing is requested. In this timer time, the paper transport time from the back side printing to the paper retreat position in the duplex printing mechanism is set. If the next print data is received by the print schedule unit within the timer time, the process proceeds to the high-speed double-sided printing process if the printing conditions allow high-speed double-sided printing. When the timer time is exceeded, the front side print data is printed on the sheet at the sheet retreat position and discharged.

FIGS. 2 to 4 are views showing an embodiment of the present invention. Hereinafter, embodiments of the present invention will be described with reference to the drawings. (1): Description of the device configuration FIG. 2 is a device configuration diagram. In FIG. 2, the printer device includes a printer control unit 2 for receiving print data from a host 1, a mechanical (engine) unit 3 as a printing mechanism, and a printing unit 4 for printing on paper.

The printer control section 2 includes a data analysis processing section 21, a print schedule section 22, a registration queue 23, a mechanical control section 24, a print processing section 25, a print queue 26, a printer print environment information setting section 27, a replacement processing section. 28 are provided.

The data analysis processing section 21 analyzes data transmitted from the host 1 and creates print page memory data (bitmap memory data). The print schedule unit 22 determines a print schedule such as a print order from input information (paper size, paper feed port, etc.) for performing printing.

The registration queue 23 stores print input information in a nonvolatile memory or the like, and can store a plurality of pages. The mechanical control unit 24 controls the mechanical unit 3 in response to a request from the print schedule unit 22. The print processing unit 25 includes a print schedule unit 22
The printing process is performed by the mechanical unit 3 in response to a printing request from the user. The print queue 26 is a memory that stores the pointers of the registration queue 23 in the order in which the print request is made to the print processing unit 25. The printer printing environment information setting unit 27 controls duplex printing on the printer device side. The exchange processing unit 28 exchanges the order of print queues for high-speed double-sided printing control.

(2): Description of print control processing The data analysis processing section 21 analyzes data transmitted from the host 1 and creates print page memory data (bitmap memory data). When the print page memory data is created, a print request is output to the print schedule unit 22. When the print schedule unit 22 recognizes the print request, it receives input information (paper size, paper feed port, etc.) necessary for printing. Then, the print schedule unit 22 stores the print input information in the registration queue 23.
When the print schedule information is stored in the registration queue 23, the print schedule unit 22 next stores the pointer of the registration queue 23 in the print queue 26. At this time, the replacement processing unit 28 controls the high-speed double-sided printing. Print queue 2
6 to determine whether or not to change the order of the pointers in the registration queue 23.

That is, the registration queue 2 is stored in the print queue 26.
When three or more pointers are stored, the print schedule unit 22 determines whether or not a high-speed double-sided paper feed port is available from the print input information stored in the registration queue 23 using the stored registration queue 23 pointer. It is to judge. Hereinafter, the print control process will be described in detail.

[Explanation of Processing of Data Analysis Processing Unit 21] The data analysis processing unit 21 receives and analyzes data transmitted from the host 1. Then, the print data is developed in a bitmap memory (not shown). When the development of one page is completed, a print request is output to the print schedule unit 22.

[Explanation of Processing of Print Schedule Unit 22]
When recognizing the print request, the print schedule unit 22 stores in the registration queue 23 the print input information output from the data analysis processing unit 21 together with the print request. This print input information stores information such as a paper feed port, a paper size, the number of copies required for printing, front and back information for double-sided printing, a development offset, a printing direction (portrait, landscape), and a bitmap memory address. Have been.

The print schedule unit 22 registers the registration queue 2
When the print input information is stored in the print queue 26, the registration queue 23 is stored in the print queue 26 in the order in which the print request is transmitted to the print processing unit 25.
Store the pointer of The pointer of the registration queue 23 is an offset value from the head of the registration queue 23 (a value of a position stored in the registration queue 23). When a print request is output to the print processing unit 25, the pointer of the registration queue 23 at the start address stored in the print queue 26 is packed and deleted. When the printing is completed, the print input information stored in the registration queue 23 is also deleted.

If the speed at which the print request is received from the data analysis processing unit 21 is faster than the speed at which the print request is output to the print processing unit 25, the print queue 26 stores a plurality of pointers in the registration queue 23 waiting for the print request. Will be done. Here, three or more registration queues 23 are stored in the print queue 26.
Is stored, the print schedule unit 22
Refers to the print input information in the registration queue 23 to determine whether high-speed double-sided printing control can be performed.

[Explanation of Processing of Interchange Processing Section 28] The print schedule section 22 first refers to the paper feed port information of the print input information. The paper feed port information stores paper feed destination information such as cassette paper feed or a paper feed tray. If the paper feed port information is a paper feed port capable of performing only low-speed double-sided printing, the print queue 26 is not subjected to the process of changing the print order,
If there is a pointer of another registration queue 23 in 6, it is determined again whether the next stored pointer of the registration queue 23 is capable of high-speed double-sided printing. If the pointer of another registration queue 23 is not stored, the process of changing the printing order of the print queue 26 is ended, and the print schedule unit 2
2 outputs a print request to the print processing unit 25.

The print schedule unit 22 refers to the paper size information of the print input information stored in the registration queue 23 if the paper feed port is capable of high-speed double-sided printing. If the paper size is such that only low-speed double-sided printing is possible, the process of changing the printing order of the print queue 26 is not performed, and the print queue 2
If there is another pointer in the registration queue 23 in 6, it is determined again from the beginning whether the pointer of the next stored registration queue 23 is capable of high-speed double-sided printing. If the pointer of another registration queue 23 is not stored, the print queue 2
The print order change process of No. 6 is completed, and the print request is output from the print schedule unit 22 to the print processing unit 25.

If the paper size is such that high-speed double-sided printing is possible, the print schedule unit 22 performs a process of changing the storage order of the pointers of the registration queue 23 stored in the print queue 26 by the replacement processing unit 28. In this exchange processing, the pointer of the registration queue 23 on the front side of the first sheet and the pointer of the registration queue 23 on the back side of the second sheet are set in the print queue 26.
The order of registration is changed. When the replacement process is completed, if the pointer of another registration queue 23 exists in the print queue 26, the print schedule unit 22 determines whether the next stored pointer of the registration queue 23 is capable of high-speed double-sided printing or restarts from the beginning. judge. Another registration queue 23
If the pointer of the print queue 26 is not stored, the process of changing the print order of the print queue 26 is terminated, and the print request is output from the print schedule unit 22 to the print processing unit 25.

[Description of Setting of Timer] The print schedule section 22 gives a timer time when receiving the back side print request and starts the timer. After the timer is started, a print request for the back side print data is sent to the mechanical control unit 24.
Is output to the print processing unit 25 and printing is performed. When the back side printing is completed by the mechanical unit 3, the printed sheet is transported to a sheet retreat position in the double-sided printing mechanism. The paper transport time from the back side printing to the paper retreat position is set as a timer time, and when the print schedule unit 22 receives the next print data within the timer time, if the paper size and the paper feed port are capable of high-speed double-sided printing, the received print data Mechanical control unit 2 prints the back of the page
4 and the print processing unit 25.

When this backside printing is requested, the mechanical unit 3 executes the backside printing of the next print data while retracting the paper in the double-sided printing mechanism. If the print schedule unit 22 has not received the next print data after the timer time,
Even under the printing conditions that enable high-speed double-sided printing, the print data on the front side is printed and discharged on the sheet at the sheet retreat position in the double-sided printing mechanism without waiting for the next print data.

Instead of setting the timer, a sheet position detecting means or the like is provided to determine whether or not the sheet has been conveyed to a predetermined sheet retreat position in the double-sided printing mechanism. It is also possible to switch between printing the print data and executing the back printing of the next print data.

[Description of Printer Printing Environment Information Setting Unit 27] In the above example, double-sided printing control is performed using printing environment information attached to print data. It is also possible to automatically perform double-sided printing control such as switching between high-speed double-sided printing and low-speed double-sided printing based on the contents (printing environment information).

(3) Description of page control for high-speed double-sided printing FIG. 3 is an explanatory diagram of page control for high-speed double-sided printing. FIG.
3A illustrates the print order of the print request from the data analysis processing unit, FIG. 3B illustrates the storage state of the registration queue of the print schedule unit, and FIG. It is a description of a print order for a print request.

In FIG. 3A, the data analysis processing unit 2
The print order when a print request is made to the print schedule unit 22 from No. 1 is shown. This printing order is from 1 page to 1
The order is up to page 0. The odd page (for example, one page) becomes the front side, and the even page (for example, two pages) becomes the back side.

FIG. 3B shows the printing order in the storage state of the registration queue in the printing schedule section. This printing order is a low-speed double-sided printing order, that is, 2 pages → 1 page → 4 pages → 3 pages → 6 pages → 5 pages.

FIG. 3C shows the printing order of high-speed double-sided printing requested by the print schedule unit to the print processing unit 25. This printing order is 2 pages → 4 pages → 1 page → 6 pages → 3 pages → 8 pages...

(4): Description of Printing Process by Flowchart FIG. 4 is a flowchart of the duplex printing process. Hereinafter, FIG.
The processing will be described according to the processing S1 to S11.

S1: The data analysis processing unit 21 is the host 1
Is analyzed, bit map memory data is created and stored in the bit map memory BMM, and the process proceeds to step S2.

S2: The data analysis processing section 21 outputs a print request to the print schedule section 22, and proceeds to processing S3. S3: The print schedule unit 22 stores the print input information in the registration queue 23, stores the pointers stored in the registration queue 23 in the print queue 26 in the order of requesting the print processing unit 25 for a print request, and proceeds to step S4. Move on.

S4: When three or more pointers of the registration queue 23 are stored in the print queue 26, the print schedule unit 22 sets the designated paper feed port (by the host 1 or the printer print environment information setting unit 27) to high speed. It is determined whether double-sided printing control can be performed. If it is determined that the paper feed port can perform high-speed double-sided printing control, the process proceeds to step S5. If not, the process proceeds to step S8.

S5: The print schedule unit 22 determines whether the currently used paper feed port can perform high-speed double-sided printing control. If it is determined that the current paper feed port can perform the high-speed double-sided printing control, the process proceeds to step S6. If not, the process proceeds to step S8. May be used).

S6: The print schedule unit 22 determines whether the paper size can perform high-speed double-sided printing control. If it is determined that the paper size allows high-speed double-sided printing control, the process proceeds to step S7. If not, the process proceeds to step S8.

S7: The print schedule unit 22 uses the print queue 26 for the high-speed double-sided printing control in the exchange processing unit 28.
The process of exchanging the pointer of the registration queue 23 is performed, and the process proceeds to S8.

S8: If the high-speed double-sided printing is not possible in steps S4 to S6, the print schedule unit 22
When the replacement process is performed in the process S7, the pointer of the replacement registration queue 23 is registered in the print queue 26, and the process proceeds to the process S9.

S 9: The print schedule unit 22 determines whether or not there is a pointer to the registration queue 23 (three or more) to be replaced with the print queue 26. The registration queue 2 which is determined to be replaced with the print queue 26 by this determination
If the pointer of No. 3 exists, the process returns to step S4, and if not, the process proceeds to step S10.

S10: The print schedule unit 22 outputs a print request to the print processing unit 25 according to the order of the pointers of the registration queue 23 stored in the print queue 26,
Move to processing S11.

S11: The print processing section 25 performs a print process in the mechanical section 3. As described in the above embodiment, when a plurality of print data transmitted from the host by the application are mixed and specified by switching the paper feed port or the paper size, high-speed double-sided printing control and low-speed Printing can be performed by automatically switching the duplex printing control. In addition, since the sheet conveyance waiting time from the back side printing to the sheet retreat position in the double-sided printing mechanism is set in the timer, it is not necessary to wait for print data to be stored in a plurality of print queues when performing high-speed double-sided printing.

[0062]

As described above, the present invention has the following effects. (1): When the high-speed double-sided printing is possible by the exchange processing means based on the paper supply port information of the printing environment information, the printing order is exchanged and the high-speed double-sided printing is performed. Printing can be performed by switching between low-speed double-sided printing and high-speed double-sided printing.

(2): When high-speed double-sided printing is possible with the paper size information of the printing environment information by the replacement processing means, the printing order is replaced and high-speed double-sided printing is performed. In addition, printing can be performed by switching between low-speed double-sided printing and high-speed double-sided printing.

(3) If the high-speed double-sided printing can be performed by the replacement processing means based on the paper feed port and the paper size information of the printing environment information, the printing order is replaced and the high-speed double-sided printing is performed. For this reason, printing can be automatically performed by switching between low-speed double-sided printing and high-speed double-sided printing based on the paper feed port and paper size information.

(4): A timer is set for the time from printing of one side to printing of the other side, and when the two-sided printing is started by the exchange processing means based on the front and back information for the two-sided printing of the printing environment information. Activate the timer, and if the next print data is received within the timer time, the printing order corresponding to high-speed double-sided printing will be changed, and high-speed double-sided printing will be performed.
When performing high-speed double-sided printing, there is no need to wait for print data to be stored in a plurality of print queues.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating the principle of the present invention.

FIG. 2 is a device configuration diagram in the embodiment.

FIG. 3 is an explanatory diagram of page control for high-speed double-sided printing in the embodiment.

FIG. 4 is a flowchart of a duplex printing process according to the embodiment.

FIG. 5 is a configuration diagram of an apparatus of a conventional example.

FIG. 6 is a flowchart of a conventional double-sided printing process.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Host 2 Printer control part 3 Mechanical part 22a Exchange processing means 23 Registration queue 25a Print processing means 26 Print queue

Claims (4)

[Claims] 1. A low-speed double-sided printing in which a second sheet is printed after a first-sided double-sided printing, and a high-speed double-sided printing in which a second and subsequent sheets are printed between the first and the other sides of the first sheet. And a plurality of paper feed ports in which at least one paper feed port is capable of performing only the low-speed double-sided printing, wherein the replacement processing means feeds print environment information. A printer apparatus characterized in that when the high-speed double-sided printing is possible according to the mouth information, the printing order is changed and the high-speed double-sided printing is performed. 2. A low-speed double-sided printing in which a second sheet is printed after a first-sided double-sided printing, and a high-speed double-sided printing in which a second and subsequent sheets are printed between the first and second sides of the first sheet. And a plurality of sizes of at least one paper size capable of performing only the low-speed double-sided printing, wherein the replacement processing unit is configured to perform printing based on paper size information of printing environment information. A printing apparatus for performing a high-speed double-sided printing when the high-speed double-sided printing is possible; 3. Low-speed double-sided printing for printing the second sheet after printing on both sides of the first sheet, and high-speed double-sided printing for printing the second and subsequent sheets between the first and second sides of the first sheet. Switching processing means for changing the printing order in accordance with the following; a plurality of paper feed ports in which at least one paper feed port is capable of performing only the low-speed double-sided printing; and at least one paper size capable of performing only the low-speed duplex printing. A plurality of sizes of paper, wherein the replacement processing means performs a printing order replacement process when the high-speed double-sided printing is possible according to a paper supply port and paper size information of printing environment information, and performs the high-speed double-sided printing. Printer device characterized by performing. 4. A low-speed double-sided printing in which a second sheet is printed after a first-sided double-sided printing, and a high-speed double-sided printing in which a second and subsequent sheets are printed between the first and the other sides of the first sheet. And a timer for setting the time from printing of one side to printing of the other side, wherein the replacement processing section includes front and back information for double-sided printing of printing environment information. By starting the timer when double-sided printing is started, if the next print data is received within the timer time, the printing order corresponding to high-speed double-sided printing is replaced, and the high-speed double-sided printing is performed. Characterized printer device.