JP2002059594A - Printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a printer capable of efficiently executing printing to both sides and delivering recorded sheet in order of page numbers. SOLUTION: The printer develops print data for both surface and reverse into a bit map in a page buffer having two-page capacity when a request from a host device is printing to both sides and sequentially executes printing to both sides, first even pages and then odd pages and executes printing to one side using a both-sides unit and normal printing to one side not using the both- sides unit based on bit map data for the odd page in the page buffer in response to selection of a user without executing development of bit map data to a page buffer for an even page when only bit map data for an odd page as a last page remains in the page buffer and delivers the sheet onto a delivery tray with the printed side faced down (Step S101 to S111).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printer device, and more particularly, to a printer device for discharging recorded paper in a more efficient two-sided printing and in a page order.

[0002]

2. Description of the Related Art Conventionally, when printing data on both sides of a recording sheet, a method of sequentially printing on both sides of the recording sheet in the order of data pages has been adopted, and data of the first page is printed on one side of the recording sheet. Thereafter, the printing operation process of inverting the recording paper and printing the data of the second page on the back side is repeated to perform double-sided printing on the recording paper.

[0003] However, there is a problem that the printing efficiency is poor when double-sided printing is performed by such a printing method.

Therefore, the present applicant has previously proposed a recording paper double-sided printing method for improving the printing efficiency of double-sided printing. That is, after the data transmitted from the host device is printed on the one side of the recording paper by the printer, all the data of the odd pages are printed, and then the data of the even page is printed on the back side of the recording paper, and both sides of the recording paper are printed. The printer recognizes the number of pages of the transmitted data, and supplies the recording paper from the recording paper tray to the printing means when the data is an odd number of pages. The data is printed on one side thereof, and the recording paper is stacked on the intermediate tray. If the data is an even-numbered page, the data is temporarily stored in the memory of the printer. A double-sided printing method for recording paper, characterized in that the recording paper inverted from the recording paper is fed to a printing means and the storage data called from the memory is printed on the back side of the recording paper (Japanese Patent Laid-Open No. H10-260,086). 7 See Japanese Unexamined Patent Publication No. 154547).

[0005] That is, this double-sided printing method of recording paper is
After temporarily storing even-numbered page data and continuously printing odd-numbered page data on one side of the recording paper, continuous printing of the memory data on the back side of the recording paper allows printing on recording paper without lowering printing efficiency. Both sides are printed, and the last page and odd or even pages of the data to be printed are recognized and printed on a recording sheet, so that the data is surely printed on the paper side corresponding to the number of pages.

A conventional printing control device is connected to a printing device for sequentially printing on each of the front and back surfaces of a recording medium. The printing control device sends print data for a desired number of copies continuously to each printing device. In the case where the last page of each section corresponds to the front side of a recording medium, a printing control apparatus is proposed in which a blank page is inserted on the back side (see JP-A-11-70717).

That is, if the last page is an odd numbered page, the printing control apparatus requests a print by adding a blank page to the even numbered page, and outputs the print data of the odd numbered page using the duplex printing of the printing apparatus. At this time, the boundaries of the respective parts are not arranged on the same sheet, and are divided into sets.

[0008] Further, conventionally, the first type related to the first side printing has been described.
Number of copies judging means for judging whether or not the number of prints is equal to or greater than a predetermined number of copies in a printing apparatus capable of performing double-sided printing, comprising a sheet feeding means and a second sheet feeding means related to second-side printing And an odd number determining means for determining whether or not the total number of pages in the job is an odd number. When the affirmative determination is made by the copy number determining means and the affirmative determination is made by the odd number determining means, the last sheet is supplied to the first feeding section. The paper is fed only by the paper means, only the first side of the paper is printed, and the paper is discharged. If the negative determination is made by the copy number determining means and the affirmative determination is made by the odd number determining means, the final sheet is replaced with the second paper. Control means for feeding paper by one paper feeding means and printing the first side of the paper, and subsequently feeding by the second paper feeding means to print and discharge the second side of the paper based on white page data And a printing device characterized by comprising: That (see Japanese Patent Laid-Open No. 8-262814).

That is, this printing apparatus attempts to print at a higher speed even when the total number of printed pages is an odd number by using two paper feeding means in combination based on the total number of printed pages and the number of copies.

[0010]

However, in such a printing apparatus described in this publication, improvement is necessary in order to print a plurality of pages of print data on both sides and place the printed sheets in page order. In addition, there was a need to improve the printing efficiency.

That is, the double-sided printing method described in Japanese Patent Application Laid-Open No. Hei 7-15447 is not suitable for a printing apparatus that sequentially processes a print job for each print job including reception of print data. In addition, the printing apparatus may be complicated and expensive.

In the print control apparatus described in Japanese Patent Application Laid-Open No. H11-70717, if the last page is an odd page, a blank page is added to the even page to request printing, and printing of the odd page is performed. When the data is output using double-sided printing of the printing device, the boundaries of each set are not arranged on the same sheet and are divided into sets, so when the command indicating the end of the job is received, If the last page is an odd page, it is necessary to add a blank page to the even page and request printing, which not only wastes the page buffer but also results in poor printing efficiency. Even in the case of an odd-numbered page, in the case of a printer system device that prints from both sides, it is necessary to go through the duplex unit, and the printing efficiency is poor. Was Tsu.

Furthermore, in the printing apparatus described in Japanese Patent Application Laid-Open No. 8-262814, the total number of printed pages is an odd number by using two paper feeding means in combination based on the total number of printed pages and the number of copies. However, since printing is to be performed at a higher speed, at least two paper feeding units are required, and the size of the apparatus is increased and the cost is increased.

Therefore, according to the first aspect of the present invention, at the time of double-sided printing, received print data is expanded every two pages in a data storage unit having a storage capacity of two pages, and the two pages of the data storage unit are expanded. Of the even-numbered page is sequentially sent to the image printing means to print on one side of the sheet from the even-numbered page, the sheet is turned over by the reversing means, and the odd-numbered page is turned on the other side of the sheet. After printing the odd-numbered pages on the paper output unit, the page is sorted in page order without carrying the paper on a complicated path by performing a printing process in which the printed surface is placed with the surface on which the odd-numbered pages are printed facing down. It is an object of the present invention to provide a printer device which is inexpensive and has good usability by sequentially placing printed paper on a paper discharge unit.

According to a second aspect of the present invention, when the last page of the print data is an odd page, the printing process is performed without expanding the even page of the last page to the data storage means, so that the last page is obtained. The print data of the odd page is developed by printing only the print data of the odd page, the sheet is inverted by the reversing unit, and the odd page is printed on the surface of the inverted sheet. An object of the present invention is to provide a printer device that can be used for development and can improve the printing efficiency of the entire document.

According to a third aspect of the present invention, when the last page of the print data is an odd page, the paper is not conveyed to the reversing means, but is based on the developed data of only the odd pages developed in the data storage means. By performing the printing process, the print data of which the last page is an odd page is developed, and only the print data of the odd page is developed, and the odd page is printed on the surface of the sheet at the time of single-sided printing without inverting the sheet by the reversing unit. It is an object of the present invention to provide a printer device capable of printing and utilizing a data storage means for developing the next page and subsequent pages, and saving time for transporting a sheet to a reversing unit to further improve the printing efficiency of the entire document. And

According to a fourth aspect of the present invention, at the time of double-sided printing, when the page size of the even-numbered page is different from the page size of the odd-numbered page corresponding to the even-numbered page at the time of expanding the print data to the data storage means, If the page size is changed on the front and back sides during the duplex printing of the document by performing the printing process without expanding the page to the data storage unit, if the even page has a different page size from the odd page Without expanding the even-numbered pages, only the print data of the odd-numbered pages is expanded, the sheet is inverted by the reversing unit, and the odd-numbered pages are printed on the surface of the inverted sheet. An object of the present invention is to provide a printer device that can be used for subsequent development and that can improve the printing efficiency of the entire document.

According to a fifth aspect of the present invention, at the time of double-sided printing, when the print data is expanded in the data storage means, the page size of the print data of the even page is different from the page size of the odd page corresponding to the even page. By performing print processing based on the development data of only the odd-numbered pages developed in the data storage means without carrying the paper to the reversing means, it is possible to change the page size on the front and back sides during the duplex printing of the document. If the even page has a different page size from the odd page, only the print data of the odd page is expanded without expanding the even page, and the paper for single-sided printing is not inverted by the inverting unit. Prints an odd number of pages on the side of There are, it is an object to provide a printer device capable of further improving the printing efficiency of the entire document.

[0019]

According to a first aspect of the present invention, a printer device according to the first aspect of the present invention develops received print data once in a data storage unit for each page, and then performs a printing process on a sheet for each page by an image printing unit. In addition to discharging onto the paper discharge unit, the sheet printed on one side by the image printing unit is turned upside down by the reversing unit, printed again on the unprinted surface of the paper by the printing unit, and discharged onto the paper discharge unit. In a printer device having a two-sided printing function, the data storage means has a capacity for storing two pages of expanded data obtained by expanding the print data, and when duplex printing, the received print data is stored in the data every two pages. The data storage means,
The expanded data for the pages are sequentially sent to the image printing means from the expanded data of the even pages, and the printing is performed on one side of the sheet from the even pages. The above object is achieved by providing control means for performing a printing process of printing the odd-numbered page on the discharge unit after printing on the other side of the sheet. .

According to the above configuration, at the time of double-sided printing, the received print data is expanded into data storage means having a storage capacity of two pages every two pages, and the expanded data of two pages of the data storage means is expanded. The expanded data of the even pages were sequentially sent to the image printing means to print on one side of the paper from the even pages, the paper was reversed by the reversing means, and the odd pages were printed on the other side of the paper. After that, since the printing process for placing the odd-numbered page on the paper output unit with the surface on which the odd-numbered page is faced down is performed, the printed paper is sorted in the page order without performing the complicated paper conveyance. Can be sequentially placed on the paper discharge section, and can be recorded and output in page order at a low cost with a simple configuration, and the usability can be improved.

In this case, for example, when the last page of the print data is an odd page, the control unit develops even pages of the last page in the data storage unit. Alternatively, the print processing may be performed.

According to the above configuration, if the last page of the print data is an odd page, the printing process is performed without expanding the even page of the last page to the data storage means. Some print data
By developing only the print data of the odd numbered page, the sheet can be inverted by the reversing unit and the odd numbered page can be printed on the face of the inverted sheet, and the data storage unit can be used for the development of the next and subsequent pages. Thus, the printing efficiency of the entire document can be improved.

For example, as described in claim 3, when the last page of the print data is an odd page, the control means does not carry the paper to the reversing means, and The printing process may be performed based on the development data of only the odd pages developed in the storage unit.

According to the above arrangement, if the last page of the print data is an odd page, the printing process is performed based on the developed data of only the odd page developed in the data storage unit without carrying the sheet to the reversing unit. Therefore, the print data whose last page is an odd-numbered page is developed, and only the print data of the odd-numbered page is developed, and the odd-numbered page is printed on the surface of the sheet at the time of single-sided printing without inverting the sheet by the inversion unit. Thus, the data storage means can be used for the development of the next and subsequent pages, and the time required to convey the sheet to the reversing unit can be omitted, so that the printing efficiency of the entire document can be further improved.

Further, for example, as set forth in claim 4, at the time of the double-sided printing, when the print data is expanded in the data storage means, the page size of the even-numbered page is set to the even-numbered page. When the page size is different from the page size of the odd-numbered page, the printing process may be performed without expanding the even-numbered page to the data storage unit.

According to the above configuration, at the time of double-sided printing, when the page size of the even-numbered page is different from the page size of the odd-numbered page corresponding to the even-numbered page at the time of expanding the print data to the data storage means, Since the printing process is performed without expanding the data to the data storage unit, the page size is changed on the front and back sides during the duplex printing of the document. Without expanding the page,
By developing only the odd-numbered page print data, the sheet can be inverted by the reversing unit and the odd-numbered page can be printed on the inverted sheet surface, and the data storage unit can be used for the development of the next and subsequent pages. The printing efficiency of the entire document can be improved.

[0027] For example, as described in claim 5, at the time of the double-sided printing, when the print data is expanded in the data storage means, the page size of the print data of the even-numbered page is set as follows: When the page size is different from the page size of the odd page corresponding to the even page, the printing process is performed based on the development data of only the odd page developed in the data storage unit without carrying the sheet to the reversing unit. May be performed.

According to the above configuration, when the print data is expanded in the data storage means during the double-sided printing, if the page size of the print data of the even page is different from the page size of the odd page corresponding to the even page, the reverse is performed. Since the printing process is performed based on the expanded data of only the odd numbered pages developed in the data storage means without carrying the paper to the means, the page size changes on the front and back sides during the duplex printing of the document. If the page is different in page size from the odd-numbered page, only the print data of the odd-numbered page is expanded without performing the expansion of the even-numbered page, and the sheet is printed on one side of the sheet during single-sided printing without being inverted by the reversing unit. Odd pages can be printed, the data storage means can be used for the development of the next and subsequent pages, and the paper is transported to the reversing section. Omitted between, the printing efficiency of the entire document can be further improved.

[0029]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. It should be noted that the embodiments described below are preferred embodiments of the present invention, and therefore, various technically preferable limitations are added. However, the scope of the present invention is not limited to the following description. The embodiments are not limited to these embodiments unless otherwise specified.

FIGS. 1 to 4 are views showing an embodiment of the printer of the present invention. FIG. 1 is a diagram showing one-side printing of the printer 1 to which the embodiment of the printer of the present invention is applied. FIG. 2 is a schematic configuration diagram of the printer device 1 at the time of double-sided printing, and FIG.

In FIG. 1 and FIG.
Is a printer engine 3 (see FIG. 3) in the main body housing 2.
In addition, a printer controller 4 (see FIG. 3) and the like are built in, and a paper feed unit 5 is disposed below the main body housing 2. In the printer device 1, a transport path 6 is provided along the right side of the main body housing 2, and a duplex unit (reversing means) 7 is provided along the transport path 6. In the printer device 1, a paper discharge tray (paper discharge unit) 8 is formed at an upper portion of the main body housing 2, and the printed paper 9 is conveyed onto the paper discharge tray 8 by the conveyance path 6 to perform printing. The paper 9 is discharged with the surface facing downward (toward the main body housing 2).

The printer engine (printing means) 3 is a PC
This is a so-called electrophotographic printer engine having a U (photoconductor unit) 10. In addition to the PCU 10, a charging unit, an optical writing unit, a developing unit,
A transfer unit, a fixing unit, and the like are provided. The printer engine 3 uniformly charges the PCU 10 with the charging unit, and irradiates the PCU 10 with modulated light corresponding to the print data with the optical writing unit to form an electrostatic latent image. The developing unit attaches toner to the PCU 10 and develops the toner. The toner image on the PCU 10 is transferred to the sheet 9 by the transfer unit on the sheet 9 conveyed from the sheet feeding unit 5 to the PCU 10 through the conveying path 6. The paper 9 onto which the toner image has been transferred is heated and pressed by a fixing unit disposed on the transport path 6 to fix the paper, and then further transported, and the printed surface is placed on the discharge tray 8 with the print surface facing down. Then, the printed paper 9 is discharged.

The paper supply unit 5 includes a paper supply tray on which a plurality of papers 9 are placed, and separates the papers 9 in the paper supply tray one by one and sends out the papers 9 to the transport path 6.

In the case of single-sided printing, the paper 9 sent out from the paper supply unit 5 to the transport path 6 is transported along the transport path 6 as indicated by an arrow in FIG. 1, and a toner image is transferred by the PCU 10 on the way. The toner image is transferred to paper 9 by a fixing unit not shown.
Is discharged onto the discharge tray 8 with the printing surface facing down.

The duplex unit 7 arranged along the transport path 6 transports the paper 9 printed on one side by the PCU 10 of the printer engine 3 along a transport path indicated by an arrow in FIG. 9 in a state where the front and back surfaces of the sheet 9 are turned over, sent out to the transport path 6 again, and printed by the printer engine 3 on the unprinted side of the sheet 9, that is, in a state where the unprinted side of the sheet 9 faces the PCU 10 side. To the transport path 6.

The printer 1 prints on the unprinted surface of the sheet 9 which has been sent to the conveyance path 6 with the front and back surfaces reversed by the duplex unit 7, and conveys the paper 9 on the conveyance path 6 to discharge. The paper is discharged onto the paper tray 8 with the printing surface facing down.

As shown in FIG. 3, the printer controller 4 includes a control unit 20 and a program ROM (Read Only).
Memory) 21, RAM (Random Access Memory) 22,
A host I / F 23, a page buffer unit 24, a printer engine control unit 25, and the like are provided, and the above units are connected by a bus 26.

The host I / F 23 has a LAN (Local Ar
ea Network) or a communication line 30 such as a serial line.
Requests the printer device 1 to perform a printing process via the communication line 30. The host I / F 23 receives a print job (print data) from the host device 31 via the communication line 30, transfers the print data of the print job to a memory or the like in the control unit 20, and stores the print data. The print data from 31 is transmitted as a series of data for each print job,
Print data of a plurality of print jobs is not received at the same time.

Page buffer section (data storage means) 24
Has page buffers 24a and 24b for two pages, and print data to be printed by the printer engine 3 by the control unit 20 is developed into a bitmap.

The print engine control unit 7 is connected to the printer engine 3 and controls the conveyance of the paper 9 by the printer engine 3 and the printing process on the paper 9 based on the print data under the control of the control unit 20. .

The program ROM 21 stores the printer 1
The RAM 22 stores various programs such as a basic processing program and a double-sided printing control processing program described later, and various data necessary to execute these various programs. And stores various data.

The control unit (control means) 20 stores the program R
Based on the program in the OM 21, each unit of the printer device 1 is controlled to execute basic processing as the printer device 1, and to execute double-sided printing control processing described later.

That is, the control unit 20 controls the host device 30
If the print request is a one-sided print, the received print data is sequentially transferred to the page buffer 24 of the page buffer unit 24.
a and 24b are transferred to the optical writing unit of the printer engine 3 via the printer engine control unit 25 via the printer engine control unit 25, and the print data of the printer engine 3 is transferred via the printer engine control unit 25. By controlling the driving, the printing process is sequentially performed only on one side of the paper 9.

That is, the printer 1 is connected to the PCU 10
Is formed on the basis of the print data as described above, and the paper 9 is sent from the paper supply unit 5 to the transport path 6, and
After transferring and fixing the toner image of the CU 10 to the paper 9 conveyed along the conveyance path 6, the printed paper 9 is sequentially discharged onto the paper discharge tray 8 with the printing surface facing down.

When the print request from the host device 30 is a double-sided printing, the control unit 20 copies the first page (odd page) and the second page (even page) of the received print data to the page buffer unit. 24, the bitmap is sequentially developed in the page buffer 24a and the page buffer 24b. When the bitmap development of the second page is completed, the paper 9 is fed from the paper feeding unit 5 via the printer engine control unit 25, First, the PCM 10 of the printer engine 3 forms an image of the bitmap data of the second page (even-numbered page) developed in the page buffer 24 b on the paper surface, which is the back surface of the paper 9, and transfers the image to the duplex unit 7 from the transport path 6. To be transported. The printer device 1 reverses the front and back sides of the paper 9 with the duplex unit 7, sends out the paper 9 to the transport path 6, and transmits the bitmap data of the first page (odd page) developed in the page buffer 24 a to the printer engine control unit 25. The image data is transferred to the printer engine 3 through the PCU 10 of the printer engine 3 on the paper surface serving as the front surface of the paper 9, and the formation surface of the first page image is formed on the discharge tray 8 through the transport path 6. Drain it down. Therefore, a sorted document is obtained as an output result.

Next, the operation of the present embodiment will be described. When performing double-sided printing, the printer device 1 of the present embodiment prints odd pages later, discharges the odd pages down to the discharge tray 8 with the odd pages down, and the last page is an odd page. The printing process is performed without expanding the image data of the page corresponding to the back side of the last page in the page buffer unit 24, and according to the selection, without passing the sheet 9 through the duplex unit 7. The feature is that the paper 9 is discharged in an appropriate sorting state, and the printing process is efficiently performed to improve the printing speed.

That is, as shown in FIG. 4, upon receiving a print request from the host device 30, the control unit 20 first checks whether the print request is double-sided printing (step S101). At the time of single-sided printing instead of printing, as shown by an arrow in FIG. 1, the toner image is printed by the PCU 10 on the paper 9 sequentially sent from the paper supply unit 5 to the transport path 6 without passing the paper 9 through the duplex unit 7. After the transfer and the fixing process, a normal single-sided printing process is performed in which the printing surface is sequentially turned down on the paper discharge tray 8,
When printing of all print data is performed, the process ends (step S102).

In step S101, if the print request is for double-sided printing, the control unit 20 checks with the print command whether reception of all print data has been completed (step S101).
103) If not all the print data has been received, it is checked whether or not the bitmap in which the second (even-numbered) print data is expanded is accumulated in the page buffer 24b of the page buffer unit 24 (step S1).
04).

When the bit map of the second print data is stored in the page buffer 24b, the control unit 20 determines that it is the print timing and conveys the paper 9 along the conveyance path indicated by the arrow in FIG. Then, the printing process is performed on both sides of the sheet 9 from the even-numbered pages, and after the sheet 9 is reversed by the duplex unit 7, the odd-numbered pages are printed and the printed sheet 9 is completed.
, A normal double-sided printing process of discharging the document onto the discharge tray 8 with the odd-numbered pages on the lower side is performed, and the process returns to step S103 (step S105).

In step S104, when the bit map obtained by expanding the second print data is not stored in the page buffer 24b of the page buffer unit 24, the control unit 2
If "0", the process returns to step S103 to check whether all data reception is completed (step S103).

When the reception of all print data is completed in step S103, the control unit 9 performs a printing process for passing through the duplex unit 7 and a printing process for not passing through the duplex unit 7 according to the selection.

That is, the control unit 9 determines in step S103
When the reception of all the print data is completed, it is checked whether or not print data remains in the page buffers 24a and 24b of the page buffer unit 24 (step S106). Since the printing of the print data has been completed, the printing process ends.

In step S106, the page buffer unit 2
When the print data remains in No. 4, the control unit 20
It is checked whether the remaining print data (bitmap data) is a bitmap of an odd page, that is, whether bitmap data remains only in the page buffer 24a of the page buffer unit 24 (step S10).
7) When bitmap data remains in both the page buffer 24a and the page buffer 24b of the page buffer unit 24, the even-numbered pages and the odd-numbered pages are conveyed to both sides of the sheet 9 along the conveyance path indicated by the arrow in FIG. A normal double-sided printing process for printing the page is performed, and the process ends (step S108).

In step S107, the page buffer unit 2
When the bitmap data remains only in the page buffer 24a of the fourth page, that is, when only the bitmap data of the odd page remains, the control unit 20 performs the single-sided operation using the double-sided unit 7 according to the user's selection. Print processing to the printer. The selection of the user may be performed by a key operation of an operation unit (not shown) of the printer device 1 or may be performed by transmitting a command specifying a processing method from the host device 30.

When the use of the double-sided unit is selected, the control unit 20 transmits a bit to the page buffer 24b for expanding even-numbered pages of the page buffer unit 24 as indicated by an arrow in the transport path in FIG. Without expanding map data, for example, expanding blank data,
The bitmap data of the odd pages in the page buffer 24a is transferred to the printer engine 3, and the paper 9 is transported from the paper feeding unit 5 to the duplex unit 7 through the transport path 6 (step S109). The PCU 1 is turned upside down and sent out again to the transport path 6.
At 0, the toner image is printed on the front side (both sides) of the paper 9. The control unit 20 conveys the printed paper 9 through the conveyance path 6 and discharges the printed paper 9 onto the paper discharge tray 8 with the printing surface facing down (step S110).

If it is determined in step S107 that bitmap data of an odd page remains and that the use of the double-sided unit 7 is selected, the control unit 20
Transfers the bitmap data of the odd-numbered pages of the page buffer 24a to the printer engine 3 as indicated by an arrow in FIG. 5 is sent to the transport path 6 and printing is performed on the paper 9 as it is. The control unit 20
The printed paper 9 is transported through the transport path 6 and discharged onto the paper discharge tray 8 with the printing surface facing down (step S111).

As described above, the printer device 1 of the present embodiment stores the received print data in the page buffer 24a and the page buffer 24b of the page buffer unit 24 having the storage capacity for two pages during the duplex printing. Each time, the expanded data of two pages of the page buffer unit 24 is sequentially sent to the printer engine 3 from the expanded data (bitmap data) of the even page, and the printing is performed on one side of the sheet 9 from the even page. Paper 9 into duplex unit 7
After printing the odd-numbered pages on the other side of the paper 9, the printing process is performed such that the odd-numbered pages are placed on the paper output tray 8 with the printed side down. .

Therefore, the printed paper 9 can be sequentially placed on the paper discharge tray 8 in a state of being sorted in the page order without carrying the paper in a complicated path. Recording and output can be performed, and usability can be improved.

The printer 1 of the present embodiment is
If the last page of the print data is an odd page, the printing process is performed without developing the even page of the last page in the page buffer unit 24.

Therefore, the print data of which the last page is an odd page is developed, only the print data of the odd page is developed, and the sheet 9 is inverted by the duplex unit 7 so that the odd page is placed on the face of the inverted sheet 9. It can be printed, and the page buffer unit 24 is used for developing the next page and subsequent pages.
The printing efficiency of the entire document can be improved.

Further, the printer 1 of the present embodiment
When the last page of the print data is an odd page, printing is performed based on the development data (bitmap data) of only the odd page developed in the page buffer unit 24 without carrying the sheet 9 to the duplex unit 7. Processing is in progress.

Therefore, the print data of which the last page is an odd page is developed, and only the print data of the odd page is developed, and the odd page is printed on the surface of the sheet 9 at the time of single-sided printing without inverting the sheet 9 by the inversion unit. Printing can be performed, the page buffer unit 24 can be used for the development of the next page and subsequent pages, and the time for transporting the paper 9 to the duplex unit 7 can be omitted, thereby further improving the printing efficiency of the entire document. it can.

In the double-sided printing process, when the bit size of the print data is expanded in the page buffer unit 24, if the page size of the even-numbered page is different from the page size of the odd-numbered page corresponding to the even-numbered page, The printing process may be performed without expanding the page into the page buffer 24b.

In this way, if the page size is changed on the front and back sides during double-sided printing of the document, and the odd-numbered page is different from the odd-numbered page, the odd-numbered page is not expanded and the odd-numbered page is not expanded. By developing only the print data of the page, the sheet 9 can be inverted by the duplex unit 7 and an odd page can be printed on the inverted side of the sheet 9, and the page buffer 24, in particular, the page buffer 24b is replaced with the next page. It can be used for the subsequent development to improve the printing efficiency of the entire document.

In the double-sided printing processing, when the page size of the print data of the even-numbered page is different from the page size of the odd-numbered page corresponding to the even-numbered page when the print data is expanded in the page buffer unit 24, The printing process may be performed based on the development data of only the odd pages developed in the page buffer unit 24 without transporting the sheet 9 to the page buffer 7.

In this manner, if the page size is changed on the front and back sides during double-sided printing of the document, and the odd-numbered page is different from the odd-numbered page, the odd-numbered page is not expanded and the odd-numbered page is not expanded. , The odd number pages can be printed on the surface of the paper 9 during single-sided printing without inverting the paper 9 by the duplex unit 7, and the page buffer unit 24 is used for the development of the next and subsequent pages. In addition to the above, the time for transporting the paper 9 to the duplex unit 7 can be omitted, and the printing efficiency of the entire document can be further improved.

Although the invention made by the inventor has been specifically described based on the preferred embodiments, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the invention. It goes without saying that it is possible.

[0068]

According to the printer device of the first aspect of the present invention, at the time of double-sided printing, received print data is expanded for every two pages in the data storage means having a storage capacity for two pages, and the data storage is performed. The two pages of expanded data of the means are sequentially sent to the image printing means from the even-numbered page expanded data, and printing is performed on one side of the paper from the even-numbered pages. After printing on the other side, the printing process is performed in which the odd-numbered page is placed on the paper output unit with the surface on which the odd-numbered page is printed facing down.
Printed sheets can be sequentially placed on the sheet discharge section in a state of being sorted in page order without performing sheet conveyance on a complicated path, and can be recorded and output in page order at a low cost with a simple configuration. , The usability can be improved.

According to the printer device of the second aspect of the present invention, if the last page of the print data is an odd page, the printing process is performed without developing the even page of the last page into the data storage means. The print data whose last page is an odd-numbered page is developed, and only the print data of the odd-numbered page is developed, and the odd-numbered page can be printed on the surface of the inverted sheet by inverting the sheet by the inversion unit. The storage unit can be used for the development of the next page and thereafter, and the printing efficiency of the entire document can be improved.

According to the printer device of the third aspect of the invention, if the last page of the print data is an odd page, the paper is not conveyed to the reversing means and only the odd page developed in the data storage means is not transferred. Since the printing process is performed based on the expanded data, the print data whose last page is an odd page is expanded, and only the print data of the odd page is expanded.
Odd-numbered pages can be printed on the side of the sheet during single-sided printing without reversing the sheet at the reversing unit, and the data storage means can be used for the development of the next and subsequent pages.
It is possible to further improve the printing efficiency of the entire document by saving time for transporting the sheet to the reversing unit.

According to the printer device of the fourth aspect of the invention, at the time of double-sided printing, when the print data is expanded in the data storage means, the page size of the even-numbered page is set to the page size of the odd-numbered page corresponding to the even-numbered page. If they are different, the printing process is performed without expanding the even-numbered pages to the data storage means.Therefore, there is a change in the page size on the front and back sides during the duplex printing of the document. If different, it is possible to develop only the odd-numbered page print data without inverting the even-numbered page, and invert the sheet in the inversion section to print the odd-numbered page on the inverted sheet surface. By using the data storage means for the development of the next and subsequent pages, the printing efficiency of the entire document can be improved.

According to the printer apparatus of the fifth aspect, at the time of double-sided printing, when the print data is expanded in the data storage means, the page size of the print data of the even-numbered pages is
When the page size is different from the page size of the odd-numbered page corresponding to the even-numbered page, the printing process is performed based on the expanded data of only the odd-numbered page expanded in the data storage unit without carrying the sheet to the reversing unit. If the page size is changed on the front and back sides during double-sided printing and the page size of the even page is different from that of the odd page, only the print data of the odd page is expanded without expanding the even page. Odd pages can be printed on the side of the paper during single-sided printing without reversing the
The data storage means can be used for the development of the next page and thereafter, and the time for transporting the sheet to the reversing unit can be omitted, so that the printing efficiency of the entire document can be further improved.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a printer device to which one embodiment of the present invention is applied at the time of single-sided printing.

FIG. 2 is a schematic configuration diagram of the printer device of FIG. 1 during double-sided printing.

FIG. 3 is a circuit block diagram of the printer of FIGS. 1 and 2;

FIG. 4 is a flowchart showing print control processing by the printer of FIGS. 1 and 2;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 printer device 2 main body housing 3 printer engine 4 printer controller 5 paper feed unit 6 transport path 7 duplex unit 8 paper discharge tray 9 paper 10 PCU 20 control unit 21 program ROM 22 RAM 23 host I / F 24 page buffer unit 24a, 24b page buffer 25 printer engine control unit 26 bus 30 communication line 31 host device

Claims (5)

[Claims] An image printing means for printing the received print data on a page-by-page basis in a data storage means for each page, and discharging the print data to a paper output unit; In a printer device having a double-sided printing function of reversing the paper printed in step 2 with a reversing means, printing the unprinted surface of the paper with the printing means again, and discharging the paper onto a paper output unit, the data storage means Has a capacity for storing two pages of expanded data obtained by expanding the print data, and at the time of duplex printing, expands the received print data in the data storage means every two pages, and stores the data for two pages of the data storage means. The expanded data is sequentially sent from the expanded data of the even pages to the image printing means, and printing is performed on one side of the sheet from the even pages. Printer on the other side of the paper, and a control unit for performing a printing process for placing the odd-numbered page on the paper ejection unit with the surface on which the odd-numbered page is printed facing down. apparatus. 2. The printing apparatus according to claim 1, wherein the control unit performs the printing process when the last page of the print data is an odd page without expanding even pages of the last page into the data storage unit. The printer device according to claim 1, wherein 3. When the last page of the print data is an odd-numbered page, the control means does not carry the sheet to the reversing means and develops only the odd-numbered page in the data storage means. 3. The printer according to claim 2, wherein the printing process is performed based on data. 4. The control unit according to claim 2, wherein said page number of said even-numbered page is different from a page size of said odd-numbered page corresponding to said even-numbered page when said print data is expanded in said data storage unit during said double-sided printing. And without expanding the even page to the data storage means.
2. The printer device according to claim 1, wherein the printing process is performed. 5. The control unit according to claim 2, wherein, during the double-sided printing, when the print data is expanded in the data storage unit, the page size of the print data of the even page is changed to a page size of the odd page corresponding to the even page. If different from the size, without carrying the paper to the reversing means,
5. The printer device according to claim 4, wherein the printing process is performed based on the development data of only the odd pages developed in the data storage unit.