JPH0243070A - Perfect printing control system and perfecting cut paper printer - Google Patents

Abstract

PURPOSE:To simplify the format setting and edition of printing data by a method wherein, when a printing face is specified, printing face indication information which indicates the printing face is transmitted to the side of a perfecting cut paper printer together with printing data, and an arbitrary page specified in continuous pages is forcibly positioned to the specified printing face and subjected to printing. CONSTITUTION:In the perfect printing of printing data transmitted from a host 40 on each cut paper 111 or the like by a perfecting cut paper printer 30 in the order of continuous pages, the printing data for a page specifying a printing face is issued from the host 40 with the addition of printing face indication information which indicates the printing face. If the printing face indication information is detected during the perfect printing of the printing data on the respective cut paper 111 or the like in the order of continuous pages by the perfecting cut paper printer 30, a printing is conducted with the printing face of the printing data for a corresponding page forcibly positioned to the printing face indicated by the printing face indication information.

Description

[Detailed Description of the Invention] [Summary] Regarding a double-sided printing control method for cut paper that positions the printed side of a desired page on the front or back side of cut paper and performs double-sided printing, and a double-sided cut paper printer thereof, the printed side is printed along with print data. This is sent from the host computer (HO3T) with the purpose of sending I indication information to the printer side, and forcing the printer to position and print any specified page among consecutive pages on the specified printing surface. In the duplex printing control method when print data is printed on both sides of continuous pages on each cut paper using a duplex cut paper printer, HO3T adds information specifying the print side to the print data of the page specifying the print side. When the printer prints the print data on each cut paper on both sides of consecutive pages, if the print side instruction information is detected, the printer prints the print side of the print data of the corresponding page on the print side. The configuration is such that printing is forcibly positioned on the printing surface indicated by the instruction information.

[Industrial application field]

The present invention relates to a double-sided printing control method for positioning and printing the print side of a desired page on the front or back side when performing double-sided printing on cut paper cut to a standard size, and a double-sided cut paper printer used therein.

[Conventional technology]

Cut paper printers that print on cut paper that has been cut to a standard size are suitable for outputting various documents because the printed content is directly printed on cut paper of the desired size, and it is easy to store and manage. Because of this, it has become popular in recent years. In particular, double-sided printing of cut sheets is often used in the field of bookbinding because cut sheets printed on both sides can be bound immediately.

When performing double-sided printing on cut paper, if there is a change in the ``Chapter 1'' or ``Title'', the printing side of the page such as ``Chapter'' or ``Title'' is intentionally designated as the front or back side. There is.

When specifying the print side of a specific page in this way, the first front page is the first page, and the specific page (D Previous (D
It is necessary to insert blank pages as appropriate depending on whether the printed pages are odd or even pages.

For example, if you select the print side of a certain print page as the front side, and the print page of the previous cut sheet is an even number, the print side of the selected print page will be the front side of the next cut sheet, so there is no problem. do not have. However, if the print page of the previous cut sheet is an odd number, it is necessary to print the print data of the specified page on the front side of the next cut sheet after making the back side of the cut sheet a blank page. It is.

On the other hand, if you specify the printing side of a certain print page as the back side,
If the print page of the previous cut sheet is an odd number, the selected print page can be printed immediately on the back side of that cut sheet, but if it is an even number page, the front side of the next cut sheet can be printed as a blank page. After that, the print data of the selected page is printed on the back side.

In the conventional double-sided printing control system, when specifying the printing side of an arbitrary page in this way, it is necessary to check for each specified page whether the printing side is the front side or the back side and the previous side of the selected page. The printer checks whether the number of pages to be printed is odd or even, inserts necessary blank pages, and creates print data so that each desired print page is printed on a designated printing surface.

[Problems to be Solved by the Invention] In the conventional double-sided printing control system for cut paper, as described above, when the printing surface of a certain page among continuous pages is intentionally positioned on the front or back side, the designated Print data is created by keeping in mind the print surface and previous print page for each print page, and inserting necessary blank pages as appropriate so that each desired print page is printed on the designated print surface.

Therefore, when the print side of a certain page among consecutive pages is designated, there is a problem in that it takes time and effort to create print data. In particular, when the number of pages changes gravity, there is an inconvenience that new print data must be created by deleting or inserting blank pages each time.

When specifying the print side, the present invention sends print side instruction information that specifies the print side along with the print data to the double-sided cut paper printer side, and specifies any specified page among the continuous pages on the double-sided cut paper printer side. A double-sided printing control method that allows printing to be forcibly positioned on the printing surface, thereby making it possible to freely specify the printing surface of any page and making it easy to create and edit print data, and a double-sided cut paper printer used therefor. The purpose is to provide

[Means for Solving the Problems] In order to solve the above-mentioned problems, the double-sided printing control method of the present invention and the means adopted by the double-sided cut paper printer used therein will be explained with reference to FIG. FIG. 1 is a block diagram showing the basic configuration of a double-sided cut paper printer of the present invention.

In FIG. 1, reference numeral 30 denotes a double-sided cut paper printer, which includes a printer mechanism section 10 and a printer control section 20, and prints each print data on both sides of each cut paper in the order of consecutive pages.

The printer mechanism section 10 includes a hopper 12 that accommodates the cut paper 11 and the like, transport sections 13A and 13B that transport the cut paper 11, a printing section 14 that includes a photosensitive drum 141 and performs single-sided or double-sided printing on the cut paper 11, and a double-sided printer. It includes mechanisms such as a paper reversing mechanism 15 for reversing paper during printing, and a stacker 16 for storing stamped cut sheets 115, etc., and performs single-sided or double-sided printing on each cut sheet in the order of consecutive pages. In addition,
When it is necessary to distinguish between each cut paper, use the code "11".
Cut paper 11 with a subscript attached to it. ．． Differentiated by IL etc. Furthermore, although the hopper 12 and the stacker 16 are provided for each paper size, one set is shown in the figure.

The printer control unit 20 controls each operation of single-sided printing or double-sided printing performed by the printer mechanism unit 10.

In the printer control unit 20, 21 is a print control means,
The host computer (hereinafter referred to as HO3) is the upper system.
Sending and receiving various commands and data to and from 40 (indicated by T),
In addition to various processes such as converting print data into a character pattern storage area address, it controls the overall operation of the printer control section 20.

Reference numeral 22 denotes a print control table creation means (hereinafter referred to as PRCT creation means), in which each page information including the position of the print data of each page received from the HO3T40 and the print surface instruction information of the page designated as the print surface is created as a print page. When the printing surface of the assigned page is the same as the printing surface of the immediately preceding page, the printing control table (hereinafter referred to as 221 (indicated by PRCT) is performed.

Reference numeral 23 denotes a printing pattern creation means, which refers to each page information area of the PRCT 221 in the printing order corresponding to the number of passes of the cut sheets 11 during double-sided printing, obtains page information of the page to be printed, and selects the page specified by this page information. The print data is taken out from the print control means 21, and a process is performed to create a print pattern for one page to be printed on each cut sheet.

Reference numeral 24 denotes a printing mechanism control means that controls the printer mechanism section 10 in accordance with the printing order corresponding to the number of passes of cut sheets during double-sided printing.
controls the paper feeding, paper reversal, and paper ejection operations of each cut paper 111, etc., and double-sided prints each one-page print pattern created by the print pattern creation means 23 on each cut paper 118, etc. in a predetermined printing order. Take control.

The HO3T 40 exchanges various commands and data necessary for printing with the double-sided cut paper printer 30 and performs initialization processing for the double-sided cut paper printer 30. When specifying the print side, print side instruction information is issued as a command for the print data of that page.

Next, the double-sided printing control system of the present invention is implemented by the double-sided cut paper printer 30 and HO3T 40 described above, and is configured as follows.

That is, in the duplex printing control method when the print data sent from the HO3T40 is printed on both sides in the order of consecutive pages on each side, throat 11, etc. by the double-sided cut paper printer 30, (A) the printing side is printed from the HO3T40. (B) The double-sided cut paper printer 30 issues the print data of the specified page with print side instruction information indicating the print side, and (B) the double-sided cut paper printer 30 issues
etc., when printing data on both sides in consecutive page order,
When the printing surface instruction information is detected, the printing surface of the print data of the corresponding page is forcibly positioned on the printing surface specified by the printing surface instruction information and printed.

[For production]

Since the operation of the double-sided printing control system of the present invention is common to the operation of the double-sided cut paper printer of the present invention, the following will focus on the operation of the double-sided cut paper printer of the present invention with reference to FIGS. 2 and 3. An example will be explained in which the print data of the fourth page is printed on the front side. FIG. 2 is an explanatory diagram of PRCT, and FIG. 3 shows a double-sided printing control method in the case of a face-down method in which pages are stacked so that the first page is at the bottom. Figure 3 (A) shows the duplex printing control method when the number of passes is one, (B) shows the two-sided printing control method when the number of passes is two, and (C) shows the two-sided printing control method when the number of passes is three. It is something that The algorithms of these double-sided printing control systems are related to the number of passes and are not related to paper size, and as will be explained in detail in the embodiment section, even if the number of passes existing in the paper reversing mechanism 15 changes. , since the double-sided printing control algorithm is the same, the following is shown in the same figure (B).
The double-sided printing control operation of the present invention will be described by taking as an example the case where the number of passes is two as shown in FIG.

(2) The paper size and the number of passes in the paper reversing mechanism 15 are set by the initialization process performed on the double-sided cut paper printer 30 from the HO3T40. Currently, the number of passes is 2
It is assumed that the paper size is A4 (the following operations are not related to the paper size).

- When the initialization process is completed, the HO3T 40 exchanges commands with the print control means 21 and sequentially transmits print data starting from the first page (hereinafter, page X is indicated by P and X). If you want to specify the printing side of a page,
The print data for the page is added with print side instruction information that specifies the print side and is issued.

The print control means 21 holds the print data sent from the HO3T 40 for each page, and also holds the printing surface instruction information of the designated page. Now, assume that the printing side of P, 4 is specified to be the front side.

(2) The PRCT creation means 22 allocates the print surfaces in the order of the pages to be printed based on each page information including the position of the print data of each page held by the print control means 21 and the print surface designation information of the page designated as the print surface. If the printed side of the specified page is the same as the printed side of the previous page, insert blank page information that specifies the blank data area between the two,
Create PRCT221.

FIG. 2 shows an example of the PRCT 221 created in this way. The pages are arranged sequentially starting from page information P and 1, and the front and back printing surfaces are alternately allocated. According to the printing surface instruction information from HO3T40, "front" is specified as the printing surface of P, 4, but since the "front" of this printing surface matches the "front" of the immediately preceding printing surface of P, 3. , P, 3 and P.

Blank page information is inserted between 4 and 4 as shown in the figure. The meaning of each pointer such as FTP, PNP, and PBM will be explained in the embodiment section.

■ The print pattern creation means 23 refers to the PRCT 221 and first obtains the page information of P and 2 according to the printing order corresponding to the number of passes (=2) of cut sheets during double-sided printing, and thereby the print control means 21 Extract the print data of P and 2 located in , and create a print pattern for one page to be printed on cut paper. The procedure for determining is explained in the Examples section).

(2) On the other hand, the print control means 21 instructs the printing mechanism control means 24 according to the printing order when the number of sheets passed is two, and prints the first cut sheet 11. is taken out and fed into the printing unit 14 by the paper transport unit 13A.

1st cut paper 11. When the feeding of paper to the printing section 14 is finished,
When the print pattern creation means 23 finishes creating the print pattern P, 2, the print control means 21 instructs the printing mechanism control means 24 to control the printing section 14,
The printing pattern P, 2 created by the printing pattern creating means 23 is printed on the back side of the cut paper 11 ((a) in FIG. 3(B)).

■ Cut paper 11. After printing P and 2 on the back side of the
The printing control means 21 instructs the printing mechanism control means 24 to control the paper reversing mechanism 15 to reverse the cut paper 111,
Next, the second cut paper 11□ is sent from the hopper 12 to the printing section 1.
4 ((b) in FIG. 3(B)).

■ During this time, the print pattern creation means 23 prints the PRCT2
21, the blank page information inserted before P and 4 is obtained according to a predetermined printing order, and a blank pattern is created based on this blank page information.

■ When the creation of the blank pattern is completed and the feeding of the cut paper 11□ is completed, the print control means 21 instructs the printing mechanism control means 24 to print the print pattern creation means 22 on the back side of the second cut paper 11t. The created blank pattern is printed ((b) in FIG. 3(B)). In this case, nothing is printed on the back side of the second cut sheet 11□, leaving it blank.

■ When the printing of the blank pattern on the back side of the cut paper 11□ is completed, the print control means 21 instructs the printing mechanism control means 24 to control the paper reversing mechanism 15 to reverse the cut paper 11□ (Fig. 3). (B) of (C)).

[Phase] During this period, the printing pattern creation means 23
221, this time P, 1 according to the predetermined printing order.
Based on this, the print data of P,1 stored in the print control means 24 is retrieved, and a print pattern for one page of P,2 is created.

■ Cut paper 11 on which the print pattern of P, 1 has been created and reversed. When the paper is fed into the printing section 14, the printing control means 24 instructs the printing mechanism control means 24 to
4 to print the print pattern P, 1 on the front side of the first sheet of cut paper 111 that has been reversed ((d) in FIG. 3(B)). As a result, the first cut paper 11
．． The contents of P,1 and P,2 are printed on both sides.

o First cut paper 11. When the printing of P, 1 is completed on the front side of the paper, the printing control means 21 instructs the printing mechanism control means 24 to print the first cut paper 11'.

The sheets are discharged to the stacker 16 and stacked face down.

During this time, the print pattern creation means 23 prints the PRCT 221
, and according to the predetermined printing order, the page information for P, 3 is retrieved from the print control means 21, and a print pattern for one page of P, 3 is created. .

When the printing patterns P and 3 are created and the inverted cut paper 11□ is fed into the printing section 14, the printing control means 21 instructs the printing mechanism control means 24 to control the printing section 14. Then print the printing pattern P, 3 on the front side of the second sheet of cut paper 112 that has been reversed (the third sheet (B
) of (e)). As a result, P and 3 are printed on the front side of the second cut sheet 11□, and the back side is left blank.

■ When the printing of P and 3 on the front side of the second cut paper 11□ is completed, the print control means 21 instructs the printing mechanism control means 24 to eject the second cut paper 11□ to the stacker 16. and stack in a face-down manner (Fig. 3 (f))
.

■ P for the first pass number of 2 sheets as described above.
, 1 to P, and 3 are completed, double-sided printing is performed for the second pass number of sheets. P.

Assuming that there is no specification for the printing side of the print data of 4 to P and 7, 3
Sheet of cut paper 11. P, 4 is printed on the front side, P, 5 is printed on both sides of the back side, and the fourth cut paper 11. P and 6 are printed on the front side and P and 7 are printed on both sides of the back side.

The explanation has been given using an example where the number of passes is 2 and stacking is performed in the face-down method. However, when stacking in the face-up method, P and 1 are printed on the surface of the first cut paper 111 → Reverse the cut paper 118 and print P and 3 on the surface of the second cut paper 11□→Cut paper 1
1. (click) 11□ Reverse → 11th cut paper 1
1. Print P and 2 on the back side of → 11th cut paper 1
1. 22nd cut sheet 11□ is ejected and stacked face-up, and the back side of the second cut sheet 11□ is left blank. → Double-sided printing is performed by ejecting the 22nd cut sheet 11□ and stacking it face-up. be exposed. As a result, the first P
, 1 is on top, and the second and third double-sided printed cut sheets are stacked in page order at the bottom.

When the number of passes is 1 or 3, double-sided printing is performed using the control method shown in Figures 3 (A) and (C), but the control details are as described above when the number of passes is 2. Since this is obvious from the double-sided printing control method, a description thereof will be omitted.

As explained above, by adding printing side instruction information that specifies the printing side to the print data and inputting it to the double-sided cut paper printer, the double-sided cut paper printer side can insert or delete necessary blank pages and specify The printed page can be printed on a specified printing surface. As a result, when creating print data, you can freely specify the print side of any page without having to be aware of the print side of each page. Therefore, creating and editing print data becomes easier, and the creator It can lighten the burden.

[Embodiment] An embodiment of the double-sided control system and double-sided cut paper printer of the present invention will be described with reference to FIGS. 2 to 5. FIG. 4 is an explanatory diagram of the configuration of a double-sided cut paper printer, and FIG. 5 is a processing flowchart of an embodiment of the double-sided printing control system. 2 and 3 are as already explained.

The duplex control method of the present invention will be described below, taking as an example a case where the number of sheets passed in the paper reversing mechanism is 2, the sheets are stacked in a face-down manner, and the print data of P and 4 are specified to be printed on the front side. An embodiment of a double-sided cut paper printer will be described. Note that an embodiment of the double-sided printing control method will be explained in conjunction with the explanation of the operation of the embodiment of the double-sided cut paper printer.

(A) Structure of double-sided cut paper printer In FIG. 4, printer mechanism section 10, cut paper 11 hopper 12, paper transport sections 13A and 13B, printing section 14, photosensitive drum 141, paper reversing mechanism 15, stacker 16
, printer control unit 20, print control means 21, PRCT creation means 22, PRCT 221, print pattern creation means 2
3. Printing mechanism control means 24, double-sided cut paper printer 30
and HO3T40 are as described in FIG.

In the print control means 21, a host interface section 211 (hereinafter referred to as HIF section) performs processing for exchanging commands and data with the H0ST 40.

212 is an intermediate buffer in which data received from HO3T40 is temporarily stored.

A character code conversion unit 213 converts each character data in the print data received from the HO3T40 into an internal code that indicates the address of a corresponding character pattern in a character generator, which will be described later.

214 is a page buffer (hereinafter referred to as PB) in which character data of each page converted into internal code is stored.

215 is a pointer table (hereinafter referred to as PTT), in which each pointer (FTP
, PNP, PBM) and the number of printed pages PCNTN
is stored.

216 is a first processor (hereinafter referred to as the first MPU);
Controls the operation of each part within the print control means 21, and
Controls the overall operation of the printer control section 20.

The first MPU 216 also functions as a part of the PRCT creation means 22, and performs the process of creating the PRCT 221 and
221 pointer is updated. FIG. 2 shows an example of the PRCT 221 created in this way. As explained earlier, the number of passes is two, P,
This is a case where the printing side of 4 is instructed to be the front side.

In Figure 2, P T P (Pass Top P
o1nter), PNP (PassNow Po
1nter) and P B M (Pass Botto
mPo1nter) is each pointer for extracting print data, that is, character data, of each page according to the double-sided printing algorithm for a predetermined number of passes, and its contents are as follows.

PTP: PRCT22 of the first page, i.e. P, 1
Indicate the address above 1.

PNP: PR targeted for this print pattern development process
Specify the address on CT221.

This PNP is updated every time the printing pattern development process for one page is completed. PNP=F regardless of the number of passes
It is calculated from TP+1.

PBM: Final PRCT221 for a predetermined number of passes
Specify the address above. This PBM is updated every time double-sided printing processing for a predetermined number of passes is completed. If the number of printed pages printed in one double-sided printing by the paper reversing mechanism 15 with a predetermined number of passes is PCNTN, then PBM=PT
It is determined by P0PCNTN-1.

In the print pattern creation means 23, 231 is a bitmap memory (hereinafter referred to as BMM) in which print data for each page is expanded into a print pattern for one page to be printed and stored.

232 is a character generator (hereinafter referred to as CG) in which character patterns of various characters are stored using internal codes as addresses.

233 is a second processor (hereinafter referred to as second MPU);
CG character data of address information specified by PB214
232 and develops one page's worth of print patterns on the 8MM 231.

In the printing mechanism control means 24, 241 is a print processing section (
(hereinafter referred to as MC), hopper 1 in printer mechanism section 0
Mechanical operations in the printer mechanism section 10, such as selection and paper feeding control of the paper transport section 2, transport control of the cut paper 11 in the paper transport sections 13A and 13B, control of the paper reversing mechanism 15, selection and paper ejection control of the stacker 16, printing control, etc. control.

242 is a printer control unit (hereinafter referred to as PRC), which has an 8M
The printing pattern of a predetermined page developed on the M231 is taken out and sent to the printing section 14 of the printer mechanism section 10, and the printing conditions instructed from the first MPU 217 are sent to the MC241 to be printed. As printing conditions, the stacker or hopper to be used, the start time, etc. are specified.

(B) Operation of the Embodiment Since the single-sided printing operation is performed in the same manner as the conventional one, the print control operation for the double-sided printing of the embodiment is performed by the paper reversing mechanism 15.
An example will be explained in which the number of passes is two.

Further, the stacking method is determined by the structure of the cut paper printer, and in this embodiment, it is assumed that it is a face-down method. Therefore, when the number of passes is 2, Fig. 3 (B
Double-sided printing is performed using the control method shown in ).

(i) Initialization Processing From HO3T40, initialization processing for the double-sided cut paper printer 30 is performed, and the paper size is specified. In this embodiment, it is assumed that the paper size is A4 and the number of passes is two.

When paper size A4 is specified by HO3T40, the lth
If the paper size A4 is different from the default value of the printer, the MPU 216 sends a message to the MC 241 via the PRC 242.
to the hopper (same 1) that corresponds to paper size A4.
2) and the stacker (also shown as 16).

Further, the first MPU 216 calculates the number of printed pages PCNTN when the number of passed pages is 2 as follows: PCNTN=number of passed pages x 2, and stores the result in the PTT 215.

When the number of passes is two, PCNTN is four pages.

Furthermore, the first MPU 217 sets PTP as the first record of the PST 235, calculates the values of PNP and PBM from PNP=PTP+1 PBM=PTP+PCNTN-1, and sets them as initial values in the PTP, PNP, and PBM pointer areas of the PTT 215. . The initial value of each pointer is FTP=1
, PNP=2, and PBM=4.

■ When the above initialization process is completed, the print control means 23
The first MPU 216 of HO3 via the HIF section 211
It exchanges commands with T40 and receives print data for each page in order from P and 1.

When specifying a printing surface, the HO3T 40 issues a command including printing surface instruction information as a command for the print data of that page. In this embodiment, it is assumed that printing surface instruction information indicating that the printing surface of P, 4 is the front side is issued by a command of print data of P, 4.

The first MPU 216 instructs the character code conversion unit 213 to convert each character data in the received print data into CG2.
The address of the corresponding character pattern in PB 214 is converted into an internal code indicating the address, and stored in a predetermined position of PB 214. Here, each time one page of print data is completed, the page information is set in the PRCT 221 sequentially from the print data of P and 1. P,
When the print data up to 4 is completed, the page information of P, 1 to P, 4 is set sequentially as shown in FIG. As described above, the page information of each page includes the start address and number of data on the PB 214 of the print data of that page.

If the printing side of P, 4 is specified as the front side, the immediately preceding P,
Blank page information is inserted between the page information of 3 (printed side is the front side), and as explained earlier, the page information shown in Fig. 2 is inserted.
RCT221 is created. Among the pointers of the PTT 215 obtained earlier, FTP points to the page information area of P and 1, and PNP points to P.

2, and PBM indicates a blank page information area.

The process of receiving the print data of each page from the HO3T 40 and the process of sequentially setting each page information in the PRCT 221 are performed asynchronously with the double-sided printing process described below.

Hereinafter, with reference to the processing flowchart of FIG. 5, the double-sided printing process will be mainly explained according to its processing steps.

■ Processing S.

The first MPU 216 uses the PN set in the PTT 215.
Refer to the page information area of P, 2 of PRCT 221 indicated by P (=2), and complete the input of page information of P, 2, that is, input P to PB 214.

Wait until the input of print data for one page in step 2 is completed. Inputting the print data P, 2 to the PB 214 is performed by the input process described in (2) above.

PNP of PRCT221 as explained in above ■
When the page information of P, 2 is set in the area indicated by , the first MPU 216 uses this page information to
Extract the print data of P and 2 from 4 and send it to the 2nd MPU.
Send to 233. The second MPU 233 extracts each character data of P and 2 from the CG 232 from the address of the print data, expands it to a predetermined position on the 8MM 231, and outputs it to the first MPU 233.
Notify U216.

(2) Processing S2 When the first MPU 216 finishes developing the print data for one page of P, 2, it instructs the PRC 242 to print the printing conditions, and causes the printing of P, 2.

The PRC 242 takes out the print pattern P, 2 from the 8MM 231 and supplies it to the printing section 14.
The printing conditions instructed by the PU 216 are sent to the MC 241. The MC 241 takes out the first sheet of A4 cut paper 11+ from the hopper 12 according to the print condition instructions, feeds the paper to the printing section 14 by the paper conveyance section 13A, and prints the cut paper 11.
Print the printing pattern P and 2 on the back side of the (3rd
(a) in Figure (B)).

■ Processing Sz, S4, ss 1st A4 cut paper 11. When P, 2 is printed, the first MPU 216 determines whether PNP=PBM (processing SS). When printing P, 2, PNP=
2. Since PBM=4, PNP<PBM and PNP=PBM does not hold.

When PNP=PBM does not hold, the first MPU 216
Increment NP by 2 pages and change PNP of PTT233 to P
Update to NP+2=4 (processing S4).

Next, the first MPU 216 determines whether the updated PNP is larger than the PBM (processing si. This time, P
Since NP=4=PBM, PNP>PBM is denied and the process returns to the first process S.

■ Processing S,,S.

Refer to PRCT221 in the same manner as the above-mentioned processing SI,
This time, the instruction blank page information of the updated PNP (=4) is detected. In the case of blank page information, a blank pattern is developed at a predetermined position on the 8MM 221 (processing S+).

On the other hand, when the first MPU 216 finishes printing P and 2 on the cut paper 11+, it instructs the MC 241 via the PRC 242, controls the paper reversing mechanism 15, and controls the paper reversing mechanism 15 to print the cut paper 11+. Invert.

Next, when the first MPU 216 detects the completion of development of the blank pattern, it instructs the PR0242 in the same manner as in the above-mentioned ■, and this time prints the second A4 cut paper 11□ on the printing unit 14.
A blank pattern is printed on the back side of the sheet (process S2, (b) in FIG. 3(B)).

■ Processing S, l, S.

When the blank pattern is printed on the second A4 cut sheet 11□, the first MPU 2L6 determines whether PNP=PBM holds true (processing S3).

When printing a blank pattern, PNP=4, so PNP=
4=PBM is established.

When PNP=PBM is established, the first MPU 216 updates PNP to the FTP value (=1) in S6), S
Return to the process of l.

■ Processing S,,S.

In the same way as each process S described above, this time the updated PN
The print data of P and l specified by P (=1) is PB21
4. Wait for the input to be completed (processing SI). When the input of the print data of P, 1 to the PB214 is completed, the first MPU2
16 takes out the print data of P, 1 from the PB 214 and sends it to the second MPU 233 . The second MPU 233 obtains each character data of P and 1 from the CG 232 according to this print data and develops it at a predetermined position on the 8MM 231 (processing S+).

On the other hand, when the first MPU 216 finishes printing the blank pattern on the cut paper 11g, the first MPU 216 sends a message to the MC 23 via the PRC 242.
6 and controls the paper reversing mechanism 15 to also reverse the second cut sheet 11□ ((C) in FIG. 3(B)).

Next, when the first MPU 216 detects the completion of the development of the print data for one page of P, 1, it instructs the PRC 242 in the same manner as in the above-mentioned (2), and this time, it instructs the PRC 242 to print the reversed first sheet of cut paper 11. is fed into the printing unit 14, P, 2
P on the printed side opposite to the printed side.

1 is printed (process sz, (d) in FIG. 3(B)).

As a result, the first 84 cut sheets 11. niP.

The contents of 1, P, and 2 are printed on both sides.

■ Processing S3, S4 First cut paper 11. When double-sided printing of P, l and P, 2 is performed, the first MPU 216 prints PNP=PB.
It is determined whether M holds true (processing S3).

P on the back of the first cut paper 11+, P when printing 1.
Since NP=1 and PBM=4, PNP=PBM
does not hold true.

When PNP=PBM does not hold, similarly to the above ■,
The first MPU 216 converts the PNP of the PTT 215 into PNP+
2 (=3) (processing S4).

Next, the first MPU 216 determines whether the updated PNP is larger than the PBM (processing SS). PNP
Since PNP=3 and PBM=4, PNP>PBM is also denied this time and the process returns to the first process Sl.

[Phase] Processing St, Sz In the same way as each processing SI described above, this time the updated PN
P (=3) indicates P, 3 print data is PB
214 until the input is completed (processing Sl). PB23
When the input of the print data of P and 3 is completed, the first MP
The U216 takes out the print data of P and 3 from the PB214 and sends it to the second MPU233. The second MPU 233 obtains each character data of P and 3 from the CG 232 according to this print data and develops it at a predetermined position on the 8MM 231 (processing S1).

On the other hand, the first MPU 216 instructs the MC 241 to complete the double-sided printing of P, 1 and P, 2 on the first cut paper 11, discharges the first cut paper 111 to the stacker 16, and prints the first cut paper 111 face down. Stack by method.

Next, when the first MPU 216 detects the end of development of the print data for one page of P and 3, it instructs the PRC 242 in the same manner as in the above-mentioned ■, and this time sends the reversed second cut sheet 11□ to the printing section. 14, and print P on the printing side (front side) opposite to the printing side (back side) of the blank pattern.
3 (process S2, (e) in FIG. 3(B)),
, : As a result, P, 3 and a blank pattern are printed on both sides of the second cut sheet 11□.

■ Processing S2. S4 When the P, 3 and blank patterns are printed on both sides of the second cut sheet 11□, the first MPU 216 prints the PNP
= Determine whether PBM is established (processing S, l). When printing P and 3 on the surface of the second cut paper 11z, PNP
Since PNP=3 and PMB=4, PNP=PBM does not hold.

When PNP=PBM does not hold, similarly to the above ■,
The first MPU 216 converts the PNT of the PTT 215 into PNP+
2 (=5) (processing S4).

Next, the first MPU 216 determines whether the updated PNT is larger than the PBM (processing S). This time, PNP=5 and PBM=4, so PNP>PBM holds true.

@ Processing S,,S,,S.

When PNP (=5)>PBM (=4) holds true, the first MPU 216 updates the PT of the PTT 215 using the update formula (PBM=4): PBM+1→PTP.
P is updated to "5" (process 37).

Next, the update formula PTP+PCNTN-1→PBM (
FTP=5, PCNTN=4), P of PTT215
Update BM to "8".

Furthermore, by the update formula FTP+1→PNP (FTP=5), the PN of PTT215
Update P to "6".

■ Using the PTP, NP and PBM updated in this way as page information pointers of the PRCT 221, the second two cut sheets 11 are fed to the paper reversing mechanism 15.
3 and 11. On the other hand, the contents of P, 4 to P, 7 are printed on both sides. In this case, PBM points to the page information area of P, 7, and FTP and PNP initially point to the page information area of P, 4, and 6.

As a result, assuming that there is no designation for the printing side of the print data of P, 4 to P, 7, P, 4 are printed on the front side of the third cut sheet 113 by the same double-sided printing process as in the above ■ to @. , P and 5 are printed on both sides on the back side, and the fourth cut paper 11. P on the front side.

6. P and 7 are printed on both sides on the back side.

The above has described an example in which the number of passes is two, but even when the number of passes is other than two, each pointer FTP, PNP
Then, the PBM is set and updated, and double-sided printing is performed on the number of cut sheets for each pass. For example, when the number of passes is three, the number of printed pages PCNTN=6. Therefore, initially PTP=1, PNP=FTP+2=3, and PBM=PTP+PCNTN-1=6.

Hereinafter, FTP, PNP are updated every time each page is printed according to the processing flowchart in FIG. 8, PBM=12
, and double-sided printing is performed for the second pass number of three sheets.

Even if the paper size is different, if the number of passes is the same, double-sided printing is performed using the same procedure.

As mentioned above, in order to print a specific page on a designated printing surface, in addition to inserting a blank page, the blank page may also be deleted.

〔Effect of the invention〕

As explained above, according to the present invention, the following effects can be obtained.

(1) By adding print side instruction information that specifies the print side to the print data and inputting it to the double-sided cut paper printer,
By inserting or deleting necessary blank pages on the double-sided cut paper printer side, a specific print page can be printed on a designated print side.

(2) According to (1) above, when creating print data, you can freely specify the print side of any page without being aware of the print side of each page, and therefore, create and edit print data. This makes it possible to reduce the burden on the creator.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the basic configuration of a double-sided cut paper printer of the present invention, FIG. 2 is an explanatory diagram of a print control table (PRCT) used in the double-sided cut paper printer of the present invention and an embodiment thereof, FIG. 3 is an explanatory diagram of the duplex printing control method in each pass, FIG. 4 is an explanatory diagram of the configuration of an embodiment of the duplex cut paper printer of the present invention, and FIG. 5 is a process of an embodiment of the duplex printing control method of the present invention. It is a flowchart. 23... Printing pattern creation means, 24... Printing mechanism control means.

Claims (1)

[Claims] 1. Double-sided printing control system when print data sent from a host computer (40) is printed on both sides of each cut sheet (11_1, etc.) in consecutive page order by a double-sided cut sheet printer (30) (A) The host computer (40) issues print data for a page that specifies the print side with print side instruction information that specifies the print side, and (B) the double-sided cut paper printer (30) ), when printing the print data on both sides of each cut sheet (such as 11_1) in the order of consecutive pages, if the print side instruction information is detected, the print side of the print data of the corresponding page is printed on the print side according to the print side instruction information. A double-sided printing control method that is characterized by forcibly positioning and printing on the specified printing surface. 2. When the specified print side of the specified page is the same as the print side of the immediately previous page, printing that specifies the print side of the specified page by forcibly inserting a blank page between the two with the print side instruction information 2. The double-sided printing control system according to claim 1, wherein the double-sided printing control method is forcibly positioned on a surface. 3. A printer mechanism unit (10) that is equipped with a paper reversing mechanism (15) and performs double-sided printing in page order on cut paper (11_1, etc.) cut to a standard size, and this printer mechanism unit (
10), which receives printing surface instruction information issued from a host computer (40) together with print data for a page specifying a printing surface, and A double-sided cut paper printer (30) that prints print data on both sides in the order of consecutive pages, the printer (30) comprising: (A) determining the position and print side of each page of print data received from a host computer (40); Each page information including print side specification information is arranged by assigning the print side in the order of print pages, and when the print side of the specified page is the same as the print side of the previous page, specify a blank data area between the two. (B) a print control table creation means (22) for creating a print control table (221) into which blank page information is inserted; (B) a print control table (221) according to the printing order corresponding to the number of passes of cut sheets during double-sided printing; print pattern creation means (23) that refers to each page information area of , obtains the page information of the page to be printed, and creates the print data of the page specified by this page information into a print pattern for one page to be printed on cut paper; ), and a printer control unit (20).