JPH0220358A - Printing apparatus - Google Patents

Abstract

PURPOSE:To print complicated image data by small memory capacity without erasing the same even when an overrun error is generated by performing split printing to the same surface of a recording medium by controlling the driving of a re-feed mecha nism on the basis of the error judge result of a judge means for judging the generation of the transmission error of image developing data. CONSTITUTION:When an overrun error is generated, an overrun error judge part 4 judges said error to discharge all of recording papers 11a fed already and new recording paper 11a is fed on the basis of the printing order from a control part 10. At this time, the control part 10 is performing the development processing of the image data of printing data to a bit map developing part 6 in parallel and starts the printing of the dot image developed on the developing part 5. In the first printing, printing is performed until the development completion of the developing part 6 becomes a state incapable of following the printing of a printing part to transfer to the re-feed processing of the recording paper 11a. The recording paper 11a printed by predetermined quantity is fed toward a photosensitive drum 15 and, at the point of time when the positioning of the recording paper 11a is competed and the image corresponding to printing data on and after interruption is written in the photosensitive drum 15 and printing is continued until the next overrun error is generated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a printing device having a paper refeeding mechanism for feeding a fed recording medium to a printing section.

(Problems to be Solved by the Invention) Conventionally, as this type of device, a printing device called a page printer that processes one page of manually printed information has been proposed.

Then, the input printing information (control command).

The printer is configured to analyze a print code (print code, etc.), generate image information, develop it in a bitmap memory, and send the developed image information to the printing section as a video signal.

However, since the above-mentioned bitmap memory is very expensive, it is rare for it to store all the image information for one page, but it is used for printing in which only a predetermined amount of Q image information is sequentially expanded and sent to the printing unit. Information deployment control is often executed.

[Problem to be solved by the invention]

However, if the print information (control commands, print data) input from a host computer etc. is very complex vector data, etc., the expansion address calculation becomes complicated when expanding it to the bitmap memory. If a situation occurs where the processing time exceeds the image development completion time or there is a part of a page that is overwritten many times, the development to the bitmap memory may be delayed until the video signal is sent. An overrun error occurs that prevents the process from completing.

When the above-mentioned overrun error occurs, printing on that page is deemed impossible, and printing processing on the next page is continued.

Therefore, there is a problem in that printing of overrun error pages ends in a half-finished printing state.

The present invention has been made to solve the above problems, and includes monitoring the overrun error state during the image development process to the bitmap memory and controlling the refeeding of the recording medium during printing. It is an object of the present invention to provide a printing device which can print complicated image information with a small storage capacity without losing print even if an overrun error occurs.

(Means for Solving the Problems) A printing device according to the present invention analyzes input page-by-page print information to determine whether a transfer error has occurred in the image development information transferred from the image storage means to the printing section. and a print control means for controlling the drive of the re-feeding mechanism based on the transfer error determination result by the determination means and performing divided printing on the same side of the fed recording medium.

[Effect]

In this invention, when print information for each page is input, the determination means determines whether a transfer error has occurred in the image development information transferred from the image storage means to the printing section, and the print control means operates based on the result of this determination. The driving of the re-feeding mechanism is controlled to perform division printing on the same side of the fed recording medium, and print one page of image development information of the inputted print information on the same side of the recording medium.

〔Example〕

FIG. 1 is a block diagram illustrating the configuration of a printing device showing an embodiment of the present invention, in which 1 is a human interface;
It receives print information (control commands, print data consisting of print codes, etc.) input from a host computer (not shown). 2 is the command analysis section, input interface 1
parse control commands received via. 3 is a data analysis unit that analyzes print data received via the input interface 1;

Reference numeral 4 denotes an overrun error judgment section which is a judgment means of the present invention, which analyzes the input printed information in page units and determines whether overrun transfer of image development information has occurred, which is developed into a bitmap development section 6 which is an image storage means. Determine the presence or absence. A page buffer 5 stores print data for one page. The bitmap development section 6 develops and stores the dot image of print data into a bitmap. Reference numeral 7 denotes an engine interface which converts the dot data read out from the bitmap development section 6 into a video signal and outputs it to a laser unit of the printing section (not shown).

Reference numeral 8 denotes a paper path selection switch which, based on a drive control signal output from the control section 10, divides the direction of conveyance of recording paper fed from a paper feeding section, which will be described later, into paper refeeding and paper ejection. Reference numeral 9 denotes a paper feed selection switch which, based on a drive control signal outputted from the control unit 10, distributes the paper feed between paper feed from the paper feed unit and paper feed from the paper refeed port.

2 and 3 are a cross-sectional view and a cross-sectional view of essential parts for explaining the configuration of the printing device shown in FIG. 1, and the same parts as in FIG. 1 are given the same reference numerals.

In these figures, reference numeral 11 denotes a paper feed cassette that serves as a paper feed section, and a pickup roller 12 drives a recording paper 11a.
feed into the aircraft. A laser unit 13 scans the photosensitive drum 15 with a laser beam modulated based on the video signal output from the engine interface 7.

A developing unit 14 develops the electrostatic latent image drawn on the photosensitive drum 15 into, for example, black.

] 6 is a fixing device which fixes the developer transferred to the recording paper 11a conveyed via the print guide 1B by heat and pressure. 17 is a switchback roller that can be driven in reverse;
During double-sided printing, the recording paper 11a is once conveyed by a predetermined amount, and once it passes the paper path selection switch 8, it is stopped once, and then it is driven in reverse rotation to move in the direction set by the paper path selection switch 8, that is, the paper refeed guide 20. Pull the paper in the direction of . Reference numeral 19 denotes a paper discharge guide, which functions as a paper path for discharging and transporting the recording paper 11a on which printing has been completed.

21 is a paper ejection guide, and the recording paper 11 after printing IA processing has been completed.
It functions as a paper bus for transporting paper a. A paper discharge roller 22 conveys and discharges the recording paper 11a along the paper discharge kite 21.

In addition, during normal one-sided printing, press the paper path selection switch 8.
is set upward to the right, and causes the recording paper 11a conveyed via the print guide 18 to be conveyed in the direction by the paper discharge roller 22. In addition, when printing on the front surface of double-sided printing, the paper path selection switch 8 is set horizontally, and the recording paper 11a conveyed via the printing guide 18 is once conveyed in the direction of the switchback roller 17, and then the paper path selection switch 8 is set horizontally. 8 on the recording paper 11a
When the trailing edge of the paper has passed, the switchback roller 17 is stopped, the conveyance of the recording paper 11a is stopped, and the paper path selection switch 8 is set to the upper right direction. After that, the switchback roller 17 reverses and feeds the recording paper 11a to the paper guide 2 again.
Pull and feed paper in the 0 direction.

Furthermore, when printing on the back side of double-sided printing, the paper path selection switch 8 is set horizontally, and the recording paper 11a that has been printed on the front side is fed again from the re-feeding port provided in the re-feeding guide 20, and the paper path selection switch 8 is set horizontally. 18. Paper ejection roller 22. The recording paper 11a transported via the paper ejection guide 21 is ejected and transported.

Next, the printing control operation according to the present invention will be explained with reference to FIGS. 4(a) to 4(C).

FIGS. 4(a) to 4(c) are timing charts illustrating the printing control operation according to the present invention, and BD receives the laser beam scanned from the laser unit 13 immediately before the photosensitive drum 15 scans with a horizontal synchronization signal. The image signal (video signal) V is generated in synchronization with this horizontal synchronization signal BD.
IDEO is output from the engine interface 7, and the photosensitive drum 15 is scanned with a laser beam modulated based on the image signal (video signal) VIDEO. If the overrun error determination unit 4 determines that an overrun error has occurred based on the analysis result of one page of printed information received via the human interface 1, the recording paper 11a that has already been fed and remains in the machine eject all of the paper and prepare for overrun printing processing.

Then, when the preparation for overrun printing processing is completed, the paper feed cassette 11 is
Then, the recording paper 11a is fed. At this time, the control section 10 processes the image information of the print data developed in the page buffer in parallel to the bitmap development section 6, and the dots developed in the bitmap development section 6 in synchronization with the horizontal synchronization signal BD. Start printing the image. And the first
In the second printing, printing is continued until the bitmap development unit 6 completes development in time for the printing by the printing unit (see FIG. 4(a)), and the process proceeds to line B for refeeding the recording paper 11a. That is, as shown in FIG. 3, the paper path selection switch 8 is set upward to the left, and the conveyed recording paper 11a is conveyed in the direction of the paper refeed guide 20. At this time, since the paper feed selection switch 9 is set upward to the right, the recording paper 11a on which a predetermined amount of printing has been printed is fed toward the photosensitive drum 15. Using this transport time, the control section 10 continues the dot image development process in the bitmap development section 6.
When the alignment of the recording paper 11a is completed, an image corresponding to the print information after the interruption has been written on the photosensitive drum 15. Therefore, as shown in FIG. 4(b), printing is continued until the next overrun error occurs.

Next, the recording paper 11a is conveyed in the same manner as described above, the print information is developed into a bit map, and printing is executed as shown in FIG.
A is discharged by performing conveyance control for single-sided printing.

As a result, as shown in FIG. 5, single-sided split printing processing is performed on the recording paper 11a a plurality of times, and printing for one page is finally completed.

In addition, in the above embodiment, the switchback roller 17
The case where the conveyance of the recording paper 11a is controlled by the paper feed selection switch 91 and the paper path selection switch 8 has been described, but as shown in FIG. By enabling the paper roller 22 to be driven to rotate in reverse, it is possible to cope with similar overrun error printing processing and also with double-sided printing processing.

FIG. 7 is a flowchart illustrating an example of an overrun error printing processing procedure according to the present invention. In addition, (1
) to (15) indicate each step.

First, wait for one page of print information to be received.1)
, starts analyzing the printed information (2).

Next, the overrun error determination unit 4 determines whether an overrun error will occur during bitmap development based on the print information for one page (3), N.

If so, please wait for a print command 4) and paper feed cassette 11.
The recording paper 11a is then fed (5) and normal printing processing is executed. Then, after printing is completed, the recording paper 11a is ejected in the specified direction (6), and the process proceeds to step (14) onwards.

On the other hand, if the determination in step (3) is YES, the paper conveyance direction of the recording paper 11a is set, that is, the paper feed selection switch 91 and paper path selection switch B are set (7).

Next, the printer waits for a print command (8), and after sending the print command, feeds the recording paper 11a from the paper feed cassette 11,
Printing of the dot image developed in the bitmap development section 6 is started (9). Next, in step 1, it is determined whether or not an overrun error has occurred (10). If NO, return to step (9) and continue printing; if YES, temporarily stop the recording paper 11a that is being printed and re-feed it. Feed in the paper direction 11
), the paper is re-fed toward the photosensitive drum 15 via the paper feed selection switch 9 (12). Then, resume printing 13).
How to determine whether an overrun error has occurred14
), YES, return to step (11), No
Then, determine whether printing for one page has been completed (15), N
If YES, the process returns to step (11); if YES, the next printing process is resumed.

〔Effect of the invention〕

As described above, the present invention includes a determining means for analyzing manually printed page-by-page printed information and determining whether a transfer error has occurred in image development information transferred from an image storage means to a printing unit, and a determining means for determining whether a transfer error has occurred in the image development information transferred from the image storage means to the printing section, and the transfer by this determining means. The print control means controls the drive of the re-feeding mechanism based on the error determination result and performs division printing on the same side of the fed recording medium, so there is no need to expand the storage capacity for bitmap development. ,
Can handle overrun error printing processing. Therefore, 1
No matter how complicated the print information of a page is or how large the print data is, an excellent effect is achieved in which the page can be printed with just the right amount and the right amount.

[Brief explanation of the drawing]

FIG. 1 is a block diagram illustrating the configuration of a printing device showing an embodiment of the present invention, and FIGS. 2 and 3 are sectional views and main part sectional views illustrating the configuration of the printing device shown in FIG. 1. 4(a) to 4(C) are timing charts explaining the printing control operation according to the present invention, FIG. 5 is a schematic diagram showing an example of divided print output according to the present invention, and FIG. 6 is a diagram showing an example of the divided print output according to the present invention. FIG. 7 is a sectional view illustrating the configuration of another printing device, and is a flowchart illustrating an example of an overrun error printing processing procedure according to the present invention. In the figure, 1 is the input interface, 2 is the command analysis section,
3 is a data analysis section, 4 is an overrun error judgment section, 5
1 is a page buffer, 6 is a bitmap development section, 7 is an engine interface, 8 is a paper path selection switch, and 9 is a paper feed selection switch.

Claims (1)

[Claims] an image storage means for storing a predetermined amount of image development information based on the input page-by-page print information; a printing section that prints on both sides or one side of a recording medium based on the image development information stored in the image storage means; In a printing device having a re-feeding mechanism for re-feeding the recording medium fed to the printing unit to the printing unit, the printing information is analyzed in units of pages and is transferred from the image storage means to the printing unit. determining means for determining the occurrence of a transfer error of image development information to be transferred to the same side of the recording medium fed by controlling the drive of the re-feeding mechanism based on the transfer error determination result by the determining means; 1. A printing device comprising a printing control means for performing divisional printing into.