JP2852015B2 - Recording control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] TECHNICAL FIELD The present invention relates toM 'The second note
Recording sheet (M 'Is a natural number and is a constant value)
After recording theM '+ I-th recording sheet (i =
1, 2,..., N) on the first side and the i-th page
Alternately with the recording of the second surface on the recording sheet of
Furthermore, 1 + n ~M '+ Nth recording sheet
Continuous with double-sided recording means for recording the second side,2M '+
The present invention relates to a recording control device capable of supplying recording information for 2n pages.
Things. [0002] 2. Description of the Related Art As a method of performing double-sided recording, a recording sheet is used.
After recording on the first side, the recording sheet is turned over and
And recording on the second side by feeding paper to the recording means.
You. [0003] SUMMARY OF THE INVENTION However, continuous
Using this method, multiple pages of recorded information can be recorded on multiple pages.
When recording on both sides of the recording sheet, compared to single-sided recording
There is a problem that the throughput is extremely reduced. This
In order to deal with this problem, an intermediate tray is
A method of separately recording several pages is conceivable,
Indispensable configuration of intermediate tray etc. that can load recording sheets
, The configuration becomes complicated, the cost increases, and the equipment becomes larger.
Causes a problem. Accordingly, an object of the present invention is to solve the above problems.
Then, the recording information of plural pages is recorded on both sides of the recording sheet.
High-throughput double-sided recording with a simple configuration
It is an object of the present invention to provide a recording control device which can perform the recording. [0005] Means for Solving the Problems To achieve the above object,
For example, the present inventionM 'The first recording sheet (M 'Is
After recording the first surface of a natural number (a constant value),
M '+ I-th recording sheet (i = 1, 2,...,
n) and the i-th recording sheet
And recording on the second side are performed alternately, and 1 + n to
M '+ 2nd recording of the nth recording sheet
For double-sided recording,2 consecutiveM '+ 2n pages of recorded information
A recording control device capable of supplying information,
Recorded and output in columnsM '+ N recording sheets are correct
Double-sided recording of recording information for each page so that the
Recording information in which the page number is incremented by 2 to be supplied to the means.
InformationM '+1 pages are sequentially supplied,M '+ 2j (j =
1, 2,..., N-1) as recording information to be supplied to the page
Then, the page number of the recording information supplied immediately before is m (m is
M 'Number determined according to the number of pages)
Supply,M '+ 2j + 1 as the recording information to be supplied to the page
The page number of the recording information supplied immediately before is increased by m + 2.
The record information of the added page number is supplied.M '+ 2n pages
As record information to be supplied after the eyes,M '+ 2n-1 page
From the page number obtained by reducing the page number of the record information of
Supply means for sequentially supplying recording information increasing by two;
Determine the value of M according to the size of the recording sheet
Decision means.It will be described in detail below.
Between M in the embodiment and the above M ′, M = 2M ′
+1 (that is, M ′ = (M−1) / 2)
You. [0006] Embodiments of the present invention will be described below in detail with reference to the drawings.
Will be described. FIG. 1 shows double-sided printing according to an embodiment of the present invention.
1 shows a sheet transport system of the apparatus. In this figure, 1-1 is paper feed
Section, 1-2 transport path before transfer, 1-3 use known electrophotographic technology
To form a toner image to be transferred onto the surface of a sheet.
1-4 transfer the toner image on drum 1-3 onto a sheet.
Transfer charger, 1-5 is the conveyance path before fixing, 1-6 is on the sheet
Fix the transferred toner image by heat and pressure
1-7, the conveyance path after fixing, and 1-8, the conveyance path for sheet
Branching mechanism before reversing, 1-9: transport path before reversing, 1-10: sheets
Using three known rollers to reverse the front and back of the paper
Reversing mechanism, 1-11 transport path after reversing, 1-12 transport before stacker
Road, 1-13 is stacker, 1-14 is branching mechanism before stacker, 1-15
Is an auxiliary tray. During double-sided printing, paper is fed from the paper feeding unit 1-1.
The transferred sheet is transferred to the drum 1-3 via the pre-transfer conveyance path 1-2.
Transported to Then, using a known electrophotographic technique,
The toner image formed on the drum 1-3 is transferred to the transfer charger 1-4.
Is transferred onto a sheet by corona discharge at
Then, the paper is transported to the fuser 1-6 via the transport path 1-5 before fusing.
You. Paper on which image fixing on the first side has been completed in fuser 1-6
Is transported via the transport path 1-7 after fusing, and
Sent to the reversing mechanism 1-10 via the mechanism 1-8 and the transport path 1-9 before reversing.
Can be [0009] The piece turned upside down in the reversing mechanism 1-10
Sheets that have been printed on the surface are turned over and before transfer via the transport path 1-11.
It is sent to the transport path 1-2, and the drum 1-3 and the transfer charger 1-4
The image on the back side (second side) in the same way as in the previous one-sided printing.
Photocopying is performed. After that, it passes through the pre-fixing conveyance path
The image is sent to 1-6, where the image on the second side is fixed. This
At this point, the double-sided printing is completed. The sheet printed on both sides is transported to the conveyance path 1 after fixing.
7 to branching mechanism 1-8 before reversing, transport path 1-12 before stacker and
And loaded on the stacker 1-13 via the branching mechanism 1-14 before the stacker.
It is. The operation for printing on both sides of one sheet is as follows.
As described above, the end of one-sided printing is actually
Wait and start printing on the next sheet
Due to the length of the path being considerably longer than the length of the sheet,
A decrease in throughput occurs. Therefore, the same throughput as that for one-sided printing is obtained.
(Ie, the number of pages that can be printed in a unit of time)
Sheet on drums 1-3 at the same interval as for simplex printing.
Need to be passed. The way to realize this function is
Therefore, in the present embodiment shown in FIG.
The time interval is set to twice the interval for single-sided printing. Change
In this embodiment, the reversing mechanism is used after printing on one side is completed.
The sheet that has been turned over by 1-10 is turned from the conveyance path 1-11 after turning over.
When it enters the pre-shooting transport path 1-2, it is sent from the paper feeder 1-1.
Immediately between the unprinted paper immediately after and the unprinted paper
Constitute. By operating as described above, before the transfer,
Transfer path 1-2, drum 1-3, transfer charger 1-4, transfer path before fixing
1-5, fuser 1-6, transport path after fixing 1-7, branching mechanism before reversing 1-8
In the transport path, the sheet already printed on the back side and the first side
The sheets that have been printed only on the sheets alternately flow. The pre-reversal branching mechanism 1-8 is provided for both
Single-sided printed sheets and single-sided printed sheets
Branch to transport path 1-12 before stacker or transport path 1-9 before reversing
Let it. In this case, the transfer path 1-2 before transfer, the drum 1-3, and the fixed
Transfer path 1-5 before arrival, fuser 1-6, transfer path 1-7 after fixing, before reversal
Fork mechanism 1-8, transport path 1-9 before reversing, reversing mechanism 1-10, transport after reversing
The length of a single loop of the transport path consisting of
Must be an odd multiple of the sum of the length in the transport direction and the spacing between sheets
I have to. If it is an even multiple,
1 and the sheet from the conveyance path 1-11 after reversing.
It is said that the sheets overlap on the transport path 1-2 before transfer
Inconvenience occurs. In other words, the first side of a sheet
After arriving at the position of ram 1-3, on the odd side, the sheet
The second side of the drum returns to the position of drum 1-3 again.
And In the above-described embodiment, the interval between both sides of the sheet is
(That is, the sheet that has finished printing on the first side is
Returning to drum 1-3 and printing the second side is
Number of sheets after passing through
M). Therefore, for example, when M = 5,
After printing of the first page is completed, the new
Four sheets are printed. When printing is performed on one side only,
Make sure that the print side is down so that the
Need to be loaded on the stacker 1-13. On the other hand, both
When printing on the side, load the second printed side down
There is a need to. That is, the page order is correct when printing on both sides.
In order for the paper to be neatly arranged, the paper printed on both sides of a sheet
It is necessary to print the later page of the page for the first time.
If you consider printing from the first page,
The printing of the page precedes the odd page. FIG. 2 shows the transport system shown in FIG.
The state of the sheet to be printed, even if the gap between the two sides is 5.
FIG. In this drawing, the reversing mechanism 1-10
Means that the sheet is reversed while passing between
This is schematically shown. 2-1 is a sheet transport loop, 2-2-
1 to 2-2-5 are the sheets being conveyed. Where each
The number without parenthesis written on both sides of the sheet is
Printed or printing page number, in parentheses
The letter indicates the page number to be printed. In FIG. 2, unhatched sheets 2-2-2
2 and 2-2-4 have not yet been inverted, and
The printed sheets 2-2-1 and 2-2-3 must be turned over.
And Furthermore, the sheet 2-
2-5 is currently being reversed by the reversing mechanism 1-10
It indicates that there is. FIG. 3 shows offline printing to which the present invention is applied.
1 shows a schematic diagram of the system. In the figure, reference numeral 3-1 denotes printing information, control information, and the like.
Recorded magnetic tape (hereinafter abbreviated as MT), 3-2 is MT3-1
Magnetic information conversion device for converting the information in the to an electrical signal,
3-3 is the central processing unit (hereinafter referred to as the central processing unit) that controls the entire system.
Below, CPU is abbreviated), and 3-4 shows the print information of each page as one page.
Page buffer for storing each page, 3-5 also controls CPU3-3
To transfer print information in page buffer 3-4
Printing hardware, 3-6 is a printing device that performs actual printing, 3-
7 has multiple cash registers that store various information necessary for printing each page.
Management register group consisting of registers
3-4 Enter the page information of each page created on
When printing, the page printed on the front of the paper and the
The separation registers that separate the page and the
Print registers that control the order of the printed pages, 3-10
The last set register in the management register group 3-7
Pointer indicating data, 3-11 is in page buffer 3-4
Is the current number of printable pages created in
Page number counter that indicates whether or not, 3-12 is the separation register group 3-8
Page information is created when new page information is created.
Separate set indicating the register where the information of the page should be set
Pointers, 3-13 are currently printed out of the separation register group 3-8
Separate read point indicating register corresponding to middle page
And 3-14 are the currently printed pages of the print register group 3-9.
The print pointer indicating the register corresponding to
The register corresponding to the surface to be printed in the group of registers 3-9
3-16 registers the double-sided spacing M
The double-sided interval register, 3-17, is the number of copies (that is,
Indicates how many copies of one page are to be printed continuously)
The number of copies to be copied
This is a copy number counter indicating whether or not the image has been printed. FIGS. 4 (1), (2) and 5 show FIGS.
Shows the relationship or structure of registers, pointers, etc.
You. Here, each of the management registers 3-7
The contents of the register (see Fig. 4 (1))   The page information of the page indicated by the register exists
Page presence flag 3-7-1 indicating whether or not   The page indicated by the register is stored in the page buffer.
Page buffer pointer 3-7-2 indicating the position occupied by   Other information required to print one page
It is. Each register included in the separation register group 3-8
(See Fig. 4 (2)) is the page indicated by the register.
Represents a register in the management register group 3-7 corresponding to
This is the separation management pointer 3-8-1. Each register included in print register group 3-9
(See Figure 5)   Printing indicating whether to print the side indicated by the register
Flag 3-9-1,   Management register having page information corresponding to the surface
A print management pointer 3-9-2 indicating a register in group 3-7,   When printing multiple copies of one page,
What is the surface indicated by the register of
Part number counter 3-9-3,   The surface indicated by the register is an even-numbered page (that is,
Printing side) or an odd-numbered page (ie, 2
Page index 3-9-4 indicating whether the page is to be printed the second time)
is there. This index is used for each of the print registers 3-9.
In the register, "even" and "odd" (that is,
(Even-numbered pages, odd-numbered pages). Each of the page buffers 3-4 has one page.
Divided into multiple page buffers corresponding to the page
(See FIG. 4 (1)). Each register of the management register group 3-7
The star has a one-to-one correspondence with each partial buffer of the page buffer.
Page buffer points
(See Fig. 4 (1)). Stores information necessary for printing one page.
The page buffer 3-4 and the management register group 3-7
However, it is necessary to separate these 3-4 and 3-7.
Information in the management register is stored in the page buffer.
It is also possible. However, memory capacity limitations, etc.
Cannot place page buffer in main memory due to
In some cases, page buffers that require
Placed on a secondary storage medium (such as a magnetic disk)
And put the management registers in main memory
You can also deal with it. Based on the information read from MT3-1,
The page information created on the page buffer 3-4 is the first page.
Page, 2nd page, 3rd page
You. However, the sheet on which the first side is to be printed as in the present embodiment.
A sheet in which sheets and sheets for printing the second side alternately flow
In the system, the order of pages to be printed is continuous.
No. Therefore, the means to absorb and adjust for this difference
Requires a step. The separation register group 3-8 shown in FIG.
The print register group 3-9 serves as this adjusting means. Ie minutes
The release registers 3-8 store the page buffer 3-4 (and manage
The pages created in order in the register group 3-7) are
A few pages (that is, the pages printed on the first side)
A few pages (ie the pages printed on the second side)
Plays the role of separation. On the other hand, the print registers 3-9
The order of pages to be printed is the prescribed order required for duplex printing
It plays the role of adjusting to the next pattern. The print register group 3-9 adjusts the printing order.
In order to perform the operation, a transport loop during duplex printing (see FIG. 2)
See 2-1 below) Sumire the top sheet page (both sides)
To By the print register indicated by the print pointer 3-14,
The page currently being printed (the third page on the sheet 2-2-3 shown in Fig. 2)
Page 3) and the print pointer indicated by the print pointer 3-14.
Switch the register sequentially to support paper movement on the transport loop
I do. Then, print the page order on the print register group 3-9.
The order of pages to be done. Prior to printing, first, each register group,
Initialize the interface and counter. FIG. 6 shows the initialization process.
Shows a raw chart. First, the page of the management register currently focused on is
Set the page presence / absence flag 3-7-1 to "No" (step 5-
1) Then, initialize the information of the management register,
This is repeated until initialization of the management register is completed.
(Steps 5-3 and 5-4). In steps 5-5 to 5-7, the print register group
Print flag 3-9-1 of all registers in 3-9
And set the part number counter 3-9-3 to all
To "1". Also, page index 3-9-4 is correct
Even (even-numbered pages) and odd (odd-numbered pages) alternate.
Set as follows. In step 5-8, the management register group 3-7
The appropriate registers in page pointers 3-10.
Cut. In step 5-9, the page number counter 3-11
Then, zero is set to the print counter 3-15. In step 5-10, the separation register group 3-7
Of print information for the first page of each register
Register that should be set first
Set to pointer 3-12. At step 5-11, the separation register group 3-8
Of the set registers in the separate set register 3-12
Separate the register following the register set as the period value
Set to read pointer 3-13. That is,
To set the register corresponding to the second page.
You. In step 5-12, the print register group 3-9
Of the registers in the first print on the sheet
Initialize the register corresponding to the surface to the print pointer 3-14.
Set. This register contains even-numbered pages (
That is, if page index 3-9-4 is not a register of "even")
No. In step 5-13, depending on the size of the sheet,
Is set in the double-sided interval register 3-16.
You. In step 5-14, copy part number counter 3-18
Is set to 1 and initialization is completed. When the initialization is completed in this way, the CPU 3
-3 starts creating the page. FIG. 7 is a flowchart showing the procedure for creating a page.
It is a chart. In the condition determination steps 6-1 and 6-2,
New page in the page buffer for unprinted pages.
Not create pages. In condition determination step 6-3, the page
The end of the process. If there is data on MT3-1, CPU3-3
Reads information on MT3-1 via device 3-2 (step
6-4), analyze this and manage register page buffer
Pointer 3-7-2 (specified by page pointer 3-10
Page information is created in the page buffer indicated by This
Here, creating page information means printing it on the page buffer.
Registers the information and sets the corresponding management register page presence flag.
G means that 3-7-1 is set to "Yes". Next, in step 6-5, the number of pages
Update the counter 3-11. Further, in step 6-6, the page point
The set register 3-12 separates the management register indicated by
Set in the indicated separation register. This is now created
Register the registered page in the separation register group 3-8.
To taste. In step 6-7, the separation set pointer is set
Update. In steps 6-8 and 6-9, the next page
Search for a management register that creates page information. That is,
While moving the page pointer 3-10 one by one,
Check the page presence flag 3-7-1 of the
Repeat until finding a management register with the null flag set to `` No ''.
Return. Thereafter, control is returned to step 6-1 again. In step 6-3, the mark on MT3-1 is
If it is determined that the printing information has been completed, step 6-11
The control is shifted to the judgment. In step 6-11, the separated set pointer and
From the position relative to the separate read pointer, the current page is
Check whether the page is odd or even.
If it is an odd page, the page creation ends.
If it is an even page, control is transferred to step 8-12.
You. Here, the separation read pointer must be an even number
Pointing to a page. Therefore, the separate read pointer and
Relative position to the set pointer (how many
If it is an even number, separate set pointer
Is also an even page, so the current page is
Odd number. If the relative position is an odd number,
Page is even. In step 6-12, the page pointer 3-10
Create blank page information in the indicated page buffer.
You. In the process of step 6-12, the print information of MT3-1 is odd.
If it ends with several pages (k pages), the next even number
Creating a dummy page on page (k + 1 page)
means. In this embodiment, printing of even-numbered pages is performed.
Performs before odd-numbered pages and feeds even-numbered pages
To do. Therefore, the dummy (k + 1 page) to be printed first
If there are no pages, print k pages and k + 1 pages.
The sheet is not fed. That is, for page k
Indicates that although a toner image is formed on drum 1-3,
K pages are not printed as a result
And The determination and step in step 6-11 are performed.
Even if the print information on MT3-1 is
Even if the report ends on an odd page, a dummy even page
Prevents missing pages as described above by creating
can do. Also, the last page is an even page.
When printing, it is natural to print correctly to the last page.
Can be. In steps 6-1 to 6-2, create a page
If it is determined that is impossible, wait for step 6-10.
Enter the state. This means that the page will only be printed for one page
Interrupts the creation of the page,
Pages that have not been created
Prevent destruction. Note that the CPU 3-3 sets “L” before printing.
Create a page for the page. This is
The order of pages created and the order of pages printed
This is a measure to absorb the difference. And page creation
After completion of printing, printing of the page is started. this
“L” is the reference value in condition judgment step 6-1.
The total number of page buffers in page buffer 3-4
(And each management register included in the management register group 3-7
Total number). FIGS. 8 and 9 are schematic flowcharts of the printing procedure.
Indicates a chart. In step 7-1, copy part number
1 is set to data 3-18, and initialization is performed. In step 7-2, the print pointer 3-14
Corresponding to the print management pointer 3-9-2 of the print register specified by
To the separation register specified by the separation read pointer 3-13.
Set the contents of the separation management pointer 3-8-1 in
Copy part number counter in the part number counter 3-9-3 of the print register.
Set the value of 3-18 and set the print flag 3-9-
Set 1 to "OK". In step 7-3, the print counter 3-15
Is set to 1. As described above, according to steps 7-1 to 7-3.
The first side of the page to be printed first (the second page)
Set in the print register. In step 7-4, CPU 3-3 prints
Adjust the print flag 3-9-1 of the print register indicated by the printer 3-14.
If it is "OK", the print register
Is determined to be printable and printing is performed (step
7-5 and later). In step 7-5, CPU 3-3 prints
Print management register 3-9-2 of the print register indicated by the printer 3-14
From the management register of the page to be printed from
Check the register page presence flag 3-7-1. The result
As a result, if "Yes", it is determined that there is a page to be printed.
Then, printing is performed according to steps 7-6 and below. In step 7-6, CPU 3-3 prints
Print management register 3-9-2 of the print register indicated by the printer 3-14
From the management register, and its page buffer pointer
The page buffer indicated by 3-7-2 (that is, the page to be printed)
Page). And printing hardware 3-5 and marking
The printer 3-6 is appropriately controlled to print one sheet (one side).
U. In addition, printing itself must occupy CPU3-3.
Since there is no printing,
Perform the page creation procedure. When printing of one sheet (one side) is completed, control is performed.
Move to step 7-7. In step 7-7, the CPU 3-3 sets the printing device
3-6 Whether printing was performed normally based on signals from
Check if printing is normal, and
Transfer control to step 7-8. In step 7-8, the CPU 3-3 sets the printing device
Based on the signal from 3-6 etc., the previous print is generated during printing.
Check whether the sample print is
If not, control is transferred to step 7-9. In step 7-9, the print pointer 3-14
Set the print flag of the print register indicated by
You. In step 7-10, the value of the print counter
By one. That is, steps 7-9 and
And 7-10 correspond to the side printed in step 7-6
The print register to be used. At step 7-11, the print pointer 3-14 is indicated.
The value of the part number counter 3-9-3 in the print register
Compare the value of the copy number register 3-17. And match
If so, the total number of copies of the page
It is determined that printing has been completed, and the page
Transfer control to open buffer. At step 7-12, the print pointer 3-14 is indicated.
From the print management pointer 3-9-2 of the print register,
Obtain the management register of the page that has been printed,
Set the null flag 3-7-1 to “None”. In step 7-13, the page number counter 3-11
Is reduced by one. Steps 7-12 and 7-13 described above
The page buffer that has finished printing is released by the process of
During the page creation procedure, a new
Page creation is possible. In step 7-14, the print pointer 3-14
Check the page index 3-9-4 of the print register indicated by
If so, the control is transferred to step 7-15. In step 7-15, the currently printed even
Print the odd page information on the back of several pages
(The details will be described later). At step 7-16, the print counter 3-15
Is incremented by one. At step 7-17, copy part number
1 is set to data 3-18, and initialization is performed. At step 7-18, the separation read pointer 3-
13 from the currently displayed separation register
Set the second isolation register, counting in the direction Figure
Initialization procedure shown in step 5-11
Step 3-13 already shows an even page, so
The separate read pointer 3-13 is always
Shows an even page. At step 7-19, the separation read pointer 3-
Separation management pointer 3- in the separation register specified by 13
8-1 (that is, the next register to be printed)
(Corresponding to several pages), and the page presence flag 3-
Examine 7-1. If "yes", it should be printed next
Since even pages have been created on the page buffer,
Set this even page from step 7-20
You. At step 7-20, the separation read pointer 3-
13 and the copy part number counter 3-18.
The power even page information is set in the print register. In step 7-21, the process in step 7-20
The print counter corresponding to the page set of the print register
Is incremented by one. At step 7-22, the print pointer 3-14
Is advanced by 1 and the next print register is set. In step 7-23, the print counter 3-15
Check the value of .If it is not zero, there is still a print side
Control is returned to step 7-4 again. In step 7-4, the print pointer 3-14
If the print flag 3-9-1 of the print register indicated by
If so, the control moves to step 7-32. In step 7-32, one blank print is performed.
U. Here, “blank print” is necessary to print one sheet.
Interrupt printing for a certain period of time or completely empty
This means that one white page is printed. In addition, empty
When printing, the page indicated by the print pointer 3-14 is an even number
Do not feed even pages. In addition, CPU3-3,
The same as when printing in step 7-6 for blank printing
Then, execute the page creation procedure. In step 7-5, the page to be printed
If is "NO", the control is moved to step 7-28. In step 7-28, one blank print is performed.
U. In step 7-29, the CPU 3-3 determines the distance between the two sides.
Read the double-sided interval M from register 3-16 and print pointer
M-th from the print register shown in 3-14
(That is, touch the back of the even-numbered
The print flag in the print register
To In double-sided printing according to this embodiment, even-numbered pages
Is configured to precede odd page printing.
You. Therefore, because the page creation is not in time, etc.
The page to be printed is “None” only for even pages.
Can be At step 7-30, the print pointer 3-14 is indicated.
Print register contents (print flag 3-9-1, print management
Counter 3-9-2 and part number counter 3-9-3) in the printing direction.
Second (that is, the even-numbered side to be printed next)
Copy to the star. This is marked because the page is "none"
Print even numbered pages that cannot be printed at the next even side printing
It means to do. At step 7-31, the print pointer 3-14
Set the print flag 3-9-1 of the print register indicated by
To In step 7-30, page information is set.
In step 7-31, the print register is opened.
The value of the print counter 3-15 is in steps 7-28 to 7-31.
It doesn't change. If the printing is abnormally terminated, the control is stopped.
Move to step 7-29 (step 7-7). Further, a sample in which the previous printing occurred during printing was performed.
If so, transfer control to steps 7-29
(Step 7-8). Copy part number of the printed side (print pointer 3-
Of the part number counter 3-9-3 in the print register indicated by 14.
Value) is smaller than the value of the copy number register 3-17.
Indicates that the page has not finished printing the specified number of copies.
Therefore, control is transferred to step 7-24 (step 7-11). At step 7-24, the print pointer 3-14 is indicated.
Check the page index 3-9-4 of the print register.
If so, control is transferred to step 7-25. In step 7-25, steps 7-15
By the same procedure, the odd numbered page on the back side
set. In step 7-26, the print counter 3-15
Is incremented by one. In step 7-27, a copy portion of the printed side
Set the value obtained by adding 1 to the copy number counter 3-18
You. In steps 7-14 and 7-24
If the printed page is an odd page (that is,
Page index 3-9-4 of the print register indicated by
If "odd" is determined, go to step 2-22
Transfer control. Further, in step 7-19, the next step is to print.
If it is determined that the even-numbered page is
Transfer control to Step 7-22. This means that the next even page is still
Since it has not been created, the corresponding print register
Means not to set the page. At step 7-23, the print counter 3-15
Is determined to be zero, the print register group
3-9 Since there are no more pages to print on the
Finish printing. FIG. 10 shows steps 7-6 shown in FIG.
3 is a detailed flowchart of a single-sheet printing procedure according to the first embodiment. here
The paper is fed only for printing even-numbered pages. At step 8-1, the print pointer 3-14 is indicated.
From the print management pointer 3-9-2 of the print register,
The management register of the page to be read is read. In step 8-2, the result obtained in step 8-1 is obtained.
Indicated by the page buffer pointer 3-7-2 of the management register
Directs the page buffer to the printing hardware 3-5. In step 8-3, the printing hardware is sent from the CPU 3-3.
Print command to the hardware 3-5 and the printing device 3-6.
You. In step 8-4, the print hardware
3-5 is the mark on the page buffer specified in step 8-2
The printing information (for one page) is transferred to the printing
The transferred print information is printed by the printer 3-6. Printing hardware 3-5 and printing device 3-6
CPU operates autonomously while printing one page.
Executes the printing procedure for this one page during printing, and prints
In response to the one-page printing end signal from the device 3-6, the printing
Return to order. FIG. 11 shows steps 7-15 and FIG.
Detailed flow of Step 7-25 (the contents of both steps are the same)
This is a chart where odd page information is set to the print register.
Here are the details of the procedure. In step 9-1, the double-sided interval register 3-16
To obtain the double-sided space M. In step 9-2, the print pointer 3-14 is displayed.
Mth print register counting from the printing position in the printing direction
(Corresponding to the odd numbered page on the back of the printed even numbered page.
Register). At step 9-3, the separation read pointer 3-
The contents of the separation register one before the separation register indicated by 13.
(That is, the odd number on the back of the even page just printed)
Step 9-
Set the print management pointer 3-9-2 of the print register
Cut. At step 9-4, the print pointer 3-14 is displayed.
The value of the part number counter 3-9-3 in the print register
Set the part number counter 3-9-3 in the
To In step 9-5, the M-th print register
Set the print flag 3-9-1 in "OK" to "OK". FIG. 12 is a flowchart showing steps 7-20 (even number) shown in FIG.
Procedure for setting several pages of information in the print register)
3 shows a flowchart. In step 10-1, the display of the print pointer 3-14 is performed.
The second print register (count
That is, the even side to be printed next to the even page just printed
(Register corresponding to (first surface)). In step 10-2, the separation read pointer 3-
The contents of the separation register indicated by 13 (that is,
Of the management register of the current page)
Set the print management pointer 3-9-2 in the print register of
To In step 10-3, the copy part number counter 3-
The value of 18 to the part number counter 3-9-3 of the second print register
set. In step 10-4, the second print register
Set the print flag 3-9-1 in "OK" to "OK". FIG. 13 shows steps 7-28 and FIG. 8 shown in FIG.
And detailed flow of step 7-32 (blank print execution procedure)
The chart is shown. In step 11-1, the CPU 3-3 sends the print
Blank pages for software 3-5 and printer 3-6.
Instruct printing. Then, in step 11-2, a blank page
Is printed, and the CPU 3-3 executes the page creation procedure.
You. In the printing procedure of this embodiment described above,
When printing on one side of an even page ends normally
After releasing the print register corresponding to the surface,
See steps 7-9 and 7-10), the side you just printed
Odd pages (steps 7-15, 7-16 and
And steps 7-25 and 7-26) and the next even number on the printed side
Face (see steps 7-20 and 7-21) and the print register.
To On the other hand, after printing on one side of the odd page,
Although the print register is released,
No cuts are made. Odd page shown in steps 7-15 and 7-25
After printing an even page by the setting procedure of
The odd numbered page corresponding to the back side is printed on the first sheet
Is guaranteed to be correct and page handling on both sides of the sheet is correct
It will be. [0125] In addition, the even numbered
Pages are guaranteed to print in the correct page order
You. Therefore, steps 7-15 / 7-25 and 7-20
Due to the page set procedure, both print registers 3-9
Pages are set in the order of pages required for two-sided printing
Will be done. FIG. 14 and FIG.
It is a schematic diagram which shows the aspect of surface printing. Where it breaks radially
Rings equally divided by lines are ring-shaped print registers 3-9
The arrow points to the print pointer 3-143-14, and the center of the ring is the mark.
Each represents a printing counter. Also, printing points
The direction of travel (printing direction) of 3-143-14 is clockwise in this figure.
There is. Then, the arrow points to the print pointer 3-143-
14 represents a print register. In addition, ring-shaped printing
The numbers in registers 3-9 are set in the print registers.
The page number marked on the center circle of the ring.
Indicates the value of the printing counter 3-15. (1) of FIG. 14 corresponds to step 7-3 in FIG.
Between 7 and 7-4, ie first page (second page)
FIG. 14 shows a state immediately after setting in the printing register.
(2) to (23) in FIG. 15 show the state immediately before entering step 7-22.
(24) of FIG. 15 shows the state at the time of completion of printing. Ma
Also, numbers in the ring are erased with backslashes (＼).
This means that the page is printed just before and the print register is
Indicates that it has been released. Furthermore, it is not erased by (＼)
The print register where the page number is written is the print flag.
3-9-1 is "OK" and other print registers are "NON".
It indicates that there is. In FIG. 14 and FIG.
The number of registers in the printing register group 3-9 is 10, the number of copies is 1, and all
18 pages, all pages are printed normally (sample print
Not) indicates the case where everything is printed normally
I have. Hereinafter, each case will be described in detail. FIG. 14A shows the first page of the second page to be printed.
Page shows the state immediately after being set. In FIG. 14 (2), the second page is printed (scan).
The print register is released (see step 7-6).
See pages 7-9 and 7-10).
One page and second page (see steps 7-15 and 7-16)
And the fourth page, which is the next even page,
Set to page M and page 2 from the position of Inter 3-9
(Steps 7-4 to 7-21). FIG. 14 (3) shows a state after printing the second page.
Immediately after performing blank print (see step 7-33)
State. In this embodiment, even pages are first
When a sheet printed on one side goes around the transport loop,
Print odd pages for the first time. Therefore, for a while after the start of printing, the even number
Odd pages should be printed between pages and even pages
No sheet will be present. Also, according to this embodiment
In duplex printing, paper is fed for printing even-numbered pages.
The paper feed interval is twice that of single-sided printing (ie,
(Every other sheet). Therefore, the initial printing
In, printing of even-numbered pages and blank printing alternately
Need to repeat. (1) to (5) in FIG.
1 shows an initial transient state. FIG. 14 (7) shows the first page which is an odd page.
Page is printed (see step 7-6) and the print registry
After the data is released (see steps 7-9 and 7-10)
(Steps 7-4 through 7-14 through 7-22
Immediately before). The steps from (6) in FIG. 14 to (17) in FIG.
Indicates steady state in printing, even and odd pages
Are printed alternately. At this time, the value of the print counter
Becomes 4,3 alternately (ie, after printing even pages)
3 → 4, 4 → 3 after printing odd pages). (18) to (23) of FIG.
Indicates the status. (18) in FIG. 15 prints the last 18th page.
(See step 7-6), and after releasing the register (step
See pages 7-9 and 7-10) and print the 17th page on the back.
Set in the register (see steps 7-15 and 7-16)
State. Here, page 18 is the last page,
In the judgment of Step 7-19, the next page is “Nothing”, so
20 pages are never set. After (19) in FIG. 15, no paper is fed and
Printing of several pages and blank printing are performed alternately. (23) in FIG. 15 is the last odd page.
Page 17 (ie the last page, page 18
After printing on the back of the printer, the value of the print counter 3-15 becomes zero,
This shows the state where printing is completed (12-24). In addition, page creation
As described in steps 6-12 of the procedure,
Page is created in the page buffer regardless of whether it is odd or even.
The last page to be written is always an even page. Next, in the print register group 3-9,
The number of print registers to be executed will be described. First, in the print register group 3-9, the even
Since several pages and odd pages are reliably separated,
The number of print registers must be even. FIG. 16 shows a print register in a printing process.
FIG. 14 is a schematic diagram showing a state of a print pointer 3-14 and a print pointer 3-14.
The case where the surface interval M = 7 and the number of print registers = 10 is shown.
In this figure, as in FIG. 14 and FIG.
Print registers 3-9 are represented by rings, and arrows are represented by arrows.
Represents the print pointer 3-143-14. Each section of the ring
Is set in each print register by the number in
Indicates the page number. In addition, the page number is
Is erased with a hash mark (＼).
Indicates that the register has just been opened. Printing cash register
Page number that is not erased by backslash
Is written, the print flag 3-9-1 is "OK" and other
Represents all "non". And even pages
Only the even page numbers to distinguish them from odd pages
Is enclosed in "brackets" ([,]). The direction of travel (printing direction) of the print pointer 3-14
Is clockwise. Also, the arrow on the outside of the ring
Minimum required print register range at each time
Is shown. In addition, the "M-1" and "M +"
`` 1 '', `` M '', and `` M-1 '' are print registers
Indicates the number of Note that, in this specification, cursive lowercase letters are used.
"P" is used as a character corresponding to the "L". FIG. 16A shows a P-th page (P is an even number).
Is being printed. As described above, this P is
It represents the lowercase letter L. At this time, the print register
Page is the (P-M) in addition to the P-th page.
Page, (1-M + 2) page, ..., (1-3) page
The odd numbered pages of the page
1st, 3rd,…, M-2th
You. Therefore, the number of print registers required in this case is (M-
1) FIG. 16 (2) shows that after the P-th page is printed,
The second (P + 2) th page in the printing direction
(P-1) The page is set in the Mth print register
State. At this time, it must be placed on the print register
The unprinted odd pages are the (PM) page, the (PM) page.
(M + 2) page,..., Page (P-1). this
Odd pages are set every other page on the print register.
Are on the print register at the same time.
The number of print registers only needs to be (M + 1)
Will be. FIG. 16C shows the k-th page (k is an odd number).
Is being printed. At this time, it exists on the print register
The page to be done is the kth page, the (k + 2) th page,…, (k
+ M-1) page and the (k + M + 2) page.
You. Therefore, the number of print registers in this case is M
That would be good. FIG. 16D shows a state after the k-th page is printed.
The state of is shown. Here, the print register of the k-th page is released.
After that, page (k + 2), page (k + 4),…, (k + M-
1) There is an odd page and the (k + M + 2) page
Therefore, the number of print registers to be required is M. As is clear from the above description, the print registration
The number of print registers of the star group 3-9 is the maximum double-sided spacing M_max
(Odd), M_max Good if it is an even number of +1 or more
Will be. Next, in the page buffer 3-4,
The number of page buffers to be used will be described with reference to FIG. As shown in FIG. 16A, the P-th page (P
(Even number) is printed on the print register during printing (P-
M) page, page (P-M-2),…, page (P-3)
Odd pages (total (M-1) / 2 pages) and the Pth page
Total (M + 1) / 2 pages are set
Page only exists in the page buffer.
You. As shown in FIG. 16 (2), the mark on page P
After printing, pages (P + 2) and (P-1)
After setting the page, the (PM) page, (PM-2) page
Page,…, odd pages of the (P-1) th page (total (M + 1) /
2) and the (P + 2) th page is the total (M + 1) / 2 + 1 page
Set on the print register. Here, page P
The print register and page buffer share
Was just opened to the public at this point.
A new page is still created on the page buffer where the page existed.
Not done. Also, the (P + 2) th page (even number) exists.
If there is, of course the (P + 1) page (odd number)
Also exists on the page buffer. Therefore, (2) of FIG.
(M + 1) / 2 +3 page buffers at the time shown
is necessary. As shown in FIG. 16C, the k-th page (k
(Odd number) is printed on the k-th page during printing.
Page, (k + 2) page,…, odd page of (k + M-1) page
Page (total (M + 1) / 2 pages) and (k + M + 2) pages
 (M + 1) / 2 + 1 pages exist. Also, (2) of FIG.
Similarly, the (k + M + 1) th page exists on the page buffer
Therefore, the number of required page buffers is (M + 1) / 2
+2. As shown in FIG. 16D, the mark of the k-th page
After printing, except when the k-th page is released (FIG. 16)
Page (3)), and the page where page k exists
No new pages have been created yet in the page buffer
Thus, the number of page buffers is (M + 1) / 2 + 2. As is clear from the above description,
The required minimum value of the buffer number is the maximum_max Against
T (M_max +1) / 2 +3. Next, the necessary minimum number of separation registers 3-8
explain about. First, the page set in the page buffer is set.
Is always set in the separation register.
The number of data must be greater than or equal to the number of page buffers. Now, the number of page buffers is set to n (n ≧ (M + 1)
/ 2 +3), the required number of separation registers is considered below.
Sympathize. The required number of separation registers is
From the oldest page on the page buffer to the
It is a continuous page leading to a new page (printed
The page also remains on the detach register). Paraphrase
For example, page buffer for n pages of page buffer
Oldest page (even pages are printed oddly)
The oldest page must be an odd page because it precedes several pages.
Printed) and the page buffer
It is the sum of the number of open even pages. In the case shown in (1) and (2) of FIG.
Even pages before the page are open and oldest
Since the page is the (PM) page (odd number),
-M) Even number from page to page (P-1)
The number of pages is (M-1) / 2. So the separation that should be needed
The number of registers is n + (M-1) / 2. This is further explained
Then, it becomes as shown below. [0161] (Equation 1) However, [0163] [Outside 1] (Odd) indicates an odd page. In the case of (3) and (4) in FIG.
That is as follows. [0166] (Equation 2) Therefore, the required minimum number of separation registers is
The beam becomes n + (M-1) / 2. Next, a procedure for responding to an illegal paper feed will be described.
explain about. In the printing apparatus 3-6, an illegal paper feed is detected.
Printer 3-6 informs the CPU 3-3 of the occurrence of illegal paper feed.
At the same time, the illegally fed sheet is discarded. The reason
Expect normal printing on misfed sheets
Not printable, abnormally printed sheets
It is not advisable to mix in printed sheets
is there. Moreover, incorrectly fed sheets can cause jams.
Easy to move, especially through complex transport elements such as reversing mechanisms
This is because it is not preferable. Incorrect feeding in the paper feed mechanism 1-1 (see FIG. 1)
The sheet that has produced the paper is transported after fixing via the transport path 1-2 before transfer.
It is carried to transmission route 1-7 and reaches branching mechanism 1-8 before inversion. This anti
In the pre-forward branching mechanism 1-8, unlike the normal
Branching to the transport path 1-12 is performed. Branch before stacker
In mechanism 1-14, this illegally fed sheet is placed in the auxiliary tray.
Branch output to 1-15. As described above, the illegally fed sheet is transported.
Discarded without going through the transmission loop. Therefore, if an illegal paper feed occurs,
Even pages, odd pages that should have been printed on both sides of the sheet
Several pages need to be printed correctly on another sheet.
The following describes the processing procedure when an illegal paper feed occurs with reference to the drawings.
Will be described. FIGS. 17 and 18 correspond to FIGS.
In the schematic diagram of double-sided printing shown in 5
FIG. 7 is a schematic diagram in a case in which the occurrence of the problem occurs. In addition, this implementation
In the example, paper is fed only for printing even-numbered pages.
So, of course, incorrect paper feeding will occur
At the time of printing. (1) to (5) of FIG. 17 correspond to (1) to (5) of FIG.
Since this is exactly the same as that of FIG. FIG. 17 (6) shows the state when the sixth page is printed.
Thus, the state at the time when an illegal paper feed has occurred is shown. Incorrect at the time of printing in step 7-6 shown in FIG.
When a paper feed occurs, step 7-7
Branch to 29. In step 7-29, the illegally fed sheet
Printing odd pages that were to be printed on the second side of the paper
Open the register. This marks the odd page
Blank print at the timing when it was to be printed
(See (11) in FIG. 17). This is printed here
The sheet that was to be transferred is discarded and transferred to transfer position 1-4.
Corresponding to not reaching. [0177] Next, in step 7-30, illegal paper feeding is performed.
The even page that could not be printed on the next even
Set in the print register of the surface. This causes incorrect paper feeding
Even pages that could not be printed successfully by
Is reprinted when the next paper is fed (see (8) in FIG. 17).
See). In step 7-31, a normal mark is obtained due to improper paper feeding.
Release the print register of the even-numbered page that could not be printed. Step 7-7, steps 7-29 to 7-31
Is set on the print register when passing
Since the number of pages does not change, the value of print counter 3-15 is
It does not change. Basic Algorithm of Printing Procedure According to this Embodiment
The message is, “A certain even page has been printed successfully,
First, the odd pages to be printed on the back side, and the next
And even pages are set. " Therefore,
Even if the regular paper feed is continued many times, it is loaded on the stacker
There is no effect on the page order of the sheet. Further, as is apparent from the above description,
Even if the normal paper feed occurs, the mark of one sheet (for two pages)
Only delays printing and minimizes throughput loss
Can be fastened. (FIGS. 17, 18 and 14, FIG. 1
5). That is, it is caused by (6) in FIG.
Due to incorrect paper feed, printing is two pages faster than in the case of FIG.
18 (that is, one sheet), and in (24) of FIG.
Page 17 is still unprinted. [0182] As described above, according to the present invention,
When recording information of multiple pages on both sides of a recording sheet
High-throughput double-sided recording with a simple configuration
Can be.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram showing a sheet transport system of a duplex printing apparatus according to an embodiment of the present invention. FIG. 2 is a schematic diagram showing a state of a transport system shown in FIG. 1 and sheets flowing thereon. FIG. 3 is a schematic diagram of an offline printing system to which the present invention is applied. FIG. 4 is a diagram illustrating a structure of a register and the like illustrated in FIG. 3; FIG. 5 is a diagram illustrating a structure of a register and the like illustrated in FIG. 3; FIG. 6 is a flowchart showing an initialization procedure. FIG. 7 is a flowchart illustrating a procedure for creating a page. FIG. 8 is a schematic flowchart showing a printing procedure. FIG. 9 is a schematic flowchart showing a printing procedure. FIG. 10 is a detailed flowchart showing a printing procedure for one sheet. FIG. 11 is a detailed flowchart showing an odd page setting procedure. FIG. 12 is a detailed flowchart showing a procedure for setting an even page. FIG. 13 is a detailed flowchart showing a procedure for executing a blank print. FIG. 14 is a schematic diagram illustrating a state during double-sided printing. FIG. 15 is a schematic diagram illustrating a state during duplex printing. FIG. 16 is a schematic diagram illustrating a state during double-sided printing. FIG. 17 is a schematic diagram illustrating a procedure for responding to the case where an illegal paper feed has occurred. FIG. 18 is a schematic diagram showing a procedure for responding to the case where an illegal paper feed has occurred. [Description of Signs] 1-1 Paper feeder 1-2 Transfer path before transfer 1-3 Drum 1-4 Transfer charger 1-5 Transfer path before fixing 1-6 Fixer 1-7 Transfer path after fixing 1-8 Branching mechanism before reversing 1-9 Transport path before reversing 1-10 Reversing mechanism 1-11 Transport path after reversing 1-12 Transport path before stacker 1-13 Stacker 1-14 Branching mechanism before stacker 1-15 Auxiliary tray 2-1 sheets Sheet transport loop 2-2-1 to 2-2-5 Sheets being transported 3-1 Magnetic tape (MT) 3-2 Magnetic information converter 3-3 Central processing unit (CPU) 3-4 Page buffer 3-5 Printing hardware 3-6 Printing device 3-7 Management register group 3-8 Separation register group 3-9 Printing register group 3-10 Page pointer 3-11 Page number counter 3-12 Separation set pointer 3- 13 Separate read pointer 3-14 Print pointer 3-15 Print counter 3-16 Duplex interval register 3-17 Copy number register 3-18 Copy number counter 3-7-1 Page presence flag 3-7-2 Page buffer pointer 3 -8-1 Separation management pointer 3-9-1 Print 3-9-2 Print management pointer 3-9-3 Part number counter 3-9-4 Page index (even / odd) 5-1 to 5-14, 6-1 to 6-12, 7-1 to 7-32, 8-1 to 8-4, 9-1 to
9-5, 10-1 to 10-4, 11-1 to 11-2 Control steps

Continuation of the front page (51) Int.Cl. ⁶ Identification code FI G03G 15/00 104 G03G 15/00 518 518 H04N 1/00 C 21/14 108M H04N 1/00 1/21 108 G03G 21/00 372 1 / 21 B41J 3/00 S (56) Reference JP-A-8-234631 (JP, A) JP-A-49-32519 (JP, A) JP-A-53-45932 (JP, A) JP-A-56-121056 (JP, A) JP-A-57-89771 (JP, A) JP-A-58-7797 (JP, A) JP-A-57-207940 (JP, A) JP 5-19860 (JP, B2) Kohei 5-19861 (JP, B2) (58) Fields investigated (Int. Cl. ⁶ , DB name) G03G 15/00 106 G03G 15/00 510-534 G03G 21/00 370-540 G03G 21/14

Claims (1)

(57) All Claims 1.1 to M 'th recording sheet (M' is a natural number, a constant value) after the recording of the first surface of, M '+ i th The recording of the first surface on the recording sheet (i = 1, 2,..., N) and the recording of the second surface on the i-th recording sheet are alternately performed, and 1 + n to M ′ + n. the double-sided recording means for recording the second surface for sheet of the recording sheet, a recording control device capable of supplying recording information 2 M '+ 2n pages that successive recorded and output by the double-side recording unit In order to supply the recording information for each page to the double-sided recording means so that the M ' + n recording sheets have the correct page order, the recording information in which the page number is incremented by 2 is sequentially increased by M' + 1 pages. Supply, M '
+ 2j (j = 1, 2,..., N-1) As the recording information to be supplied to the page, the page number of the recording information supplied immediately before is m (m is a number determined according to M ′ ). The recording information of the reduced page number is supplied. As the recording information supplied to the M ' + 2j + 1 page, the recording information of the page number increased by m + 2 with respect to the page number of the recording information supplied immediately before is supplied.
M ' + 2 As recording information to be supplied to the second and subsequent pages, M' +
Supply means for sequentially supplying recording information in which the page number is incremented by 2 from the page number in which the page number of the recording information of the 2n-1 page is decreased by m, and the value of M according to the size of the recording sheet A recording control device comprising: a determination unit that determines