JP2003094624A - Method for controlling ink jet recorder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problems of a conventional method for controlling an ink jet recorder such as that, when both-side printing is accomplished on a sheet the only one face of which is treated for ink jet recording in a same printing mode, for example, in a photograph picture quality mode on the front and rear faces, the front face treated for the ink jet printing can be excellently printed without blotting or the like, while the rear side which is not treated for the ink jet printer suffers from blotting when printed in the photograph picture quality mode or the like to greatly deteriorate the printing quality, and, furthermore, if the front and rear faces have to be printed on different printing conditions, the working efficiency is deteriorated with reloading of the printing sheets or the resetting of the printing condition. SOLUTION: The deterioration of the printing quality is suppressed by constituting the controlled ink jet recorder, so that printing is performed with printing density and resolution suitable for printing on the front and rear face of the sheet to be printed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling an inkjet recording apparatus which receives print data from a host computer, analyzes and expands the print data, and controls printing.

[0002]

2. Description of the Related Art FIG. 3 shows the structure of an ink jet recording apparatus. The inkjet recording device 13 includes a tractor 17 that conveys the printing paper 16, a print head 15 that ejects ink onto the paper, and a drying mechanism unit 14 that dries the ink ejected onto the paper. FIG. 3 shows an example of a double-sided inkjet recording apparatus in which print heads are mounted on both sides of printing paper.

A print head having a width larger than the width of the printing paper is called a line head, and an ink jet recording apparatus having such a print head is called a line type ink jet recording apparatus. The print head 15 which is a line head is fixed, and in synchronization with the movement of the printing paper 16,
Printing is performed by ejecting ink from the print head 15. In contrast, the print head is moved in the direction perpendicular to the feed direction of the printing paper to scan, the paper is fed according to the printing width of the scanning operation, and the printing is repeated by the serial ink jet recording. Called a device. While the serial ink jet recording apparatus prints by alternately repeating paper feeding and scanning operations, the line ink jet recording apparatus does not require a scanning operation and prints in synchronization with paper feeding. Suitable for high-speed printing.

Regarding the ink jet controller of the ink jet recording apparatus for controlling the printing operation,
This will be described with reference to FIG.

The host computer 4 has a function of adding a command to the print data as necessary and transmitting the command to the ink jet controller 3. The inkjet controller 3 receives print data from the host computer 4 in the reception process 5, and stores the data in the reception buffer 10. In parallel with the data reception of the reception process 5, the expansion process 6 sequentially reads the data in the reception buffer 10, analyzes it, restores it to raster data, and writes it to the frame memory 11. When the expansion process for one page is completed, the engine control process 12 is instructed to perform the printing operation for one page. When the engine control process 12 receives the instruction for the printing operation for one page, the engine control process 12 issues an instruction to start printing to the engine mechanism control unit 9. The engine mechanism control unit 9 reads data from the frame memory 11 in accordance with the amount of movement of the paper, and performs printing by ejecting ink from the nozzles of the print head 15 described with reference to FIG. 3 in accordance with the data.

Further, the ink jet recording apparatus has an operation panel 7 for displaying the state of the ink jet recording apparatus and setting parameters for printing, and the operation panel 7 is controlled by a panel process 8.

Next, the expansion processing will be described with reference to FIG.

In the expansion processing, first, data is read from the reception buffer (A001), the read data is analyzed by analysis processing (A002), and raster data is written to the frame memory.
(A003) When the writing for one page is completed, the print start instruction process (A004) is executed to instruct the engine control process to perform the printing operation for one page, and the expansion process is ended.

The print data transmitted from the host computer will be described with reference to FIG. FIG. 6 shows an example of data for four double-sided prints. The print data includes a header section for determining printing conditions such as a print mode and resolution, and an actual print data section for each page. As shown in FIG. 6, in this example, first, the header portion (B001) configured by print parameters such as resolution is transmitted, and subsequently, the print data portion for 8 pages is transmitted. In the order of eight pages in this example, the data of the first page is the front side of the first sheet (B002), the data of the second page is the back side of the first sheet (B003), and the data of the third page is the second sheet. The front side (B004), the data on the 4th page is the back side of the second sheet (B005), 5
The data of page 3 is the front side of the third sheet (B006), the data of page 6 is the back side of the third sheet (B007), and the data of page 7 is the front side of the fourth sheet (B0
08), the data of the 8th page is in the order of the back side of the 4th sheet (B009). Therefore, generally, printing is performed in the print mode in which the front surface and the back surface have the same resolution.

Ink jet paper is more expensive than plain paper because it is processed to reduce ink bleeding. In addition, compared to a paper processed for inkjet only on one side, a paper processed for inkjet on both sides becomes more expensive. In the case of printed matter such as printing photos or graphics on one side and text on the other side, it is ideal to print on both sides of the paper processed for inkjet, but reduce the paper cost. Therefore, there are cases where it is desired to print on paper that has been processed for inkjet only on one side. When printing is performed on the unprocessed surface of the paper that has been inkjet-processed on only one side under the same printing conditions as the inkjet-processed paper, bleeding will occur and the print quality will deteriorate significantly. There is a case. Therefore, it is necessary to print in the photo quality mode on the surface processed for inkjet and to change the printing conditions such as lowering the print density or lowering the resolution on the other unprocessed surface. is there.
For this reason, when performing double-sided printing on paper that has been processed on one side only for inkjet printing, first perform single-sided printing on the front side only, and after finishing printing, print with a print density and resolution different from the printing set on the front side. I am dealing with it by changing the conditions and then printing on the back side.

[0011]

According to the above-mentioned method, for a sheet having only one side processed for ink jet,
When double-sided printing is performed on the front surface and the back surface in the same print mode, for example, the photographic image quality mode, excellent printing without bleeding can be performed on the surface processed for inkjet. However, since the other back surface is not processed for an inkjet printing apparatus, bleeding or the like occurs when printing is performed in a photographic image quality mode or the like, and print quality is significantly deteriorated. Further, if the front side and the back side are to be printed under different printing conditions, it is necessary to reload the paper and reset the printing conditions, so the work efficiency is poor.

Therefore, in order to avoid the above problems, it is an object of the present invention to perform double-sided printing on a sheet having only one side processed for ink jet, and also for a surface not processed for ink jet. An object of the present invention is to provide a method for controlling an inkjet recording device that can suppress deterioration of print quality.

[0013]

When printing is performed on a sheet that has not been processed for ink jet, bleeding occurs. For example, even if you print dots of 1200dpi (Dot Per Inch),
In this case, the size of 1 dot equivalent to 00dpi is blurred. On the other hand, by lowering the resolution of the data to be printed in consideration of the amount of bleeding and reducing the number of dots to be ejected, or by printing in a print mode with a low print density, it is possible to suppress a decrease in print quality.

That is, the first structure of the present invention for solving the above-mentioned problems is to move one or a plurality of print heads composed of a plurality of nozzles for ejecting ink and a printing material. A control unit having a mechanical unit for ejecting ink in synchronism with the movement of the material to be printed and a printing process for receiving print data from a host computer, expanding the print data, and converting the print data into raster data. Section, and an ink jet recording apparatus having a mechanism section that enables double-sided printing on the printed material, having means for separately specifying the resolution on the front surface and the back surface of the printed material, and according to the designation of the resolution, This is because the front side and the back side are controlled to print at different resolutions.

A second structure of the present invention for solving the above-mentioned problems is to move one or a plurality of print heads composed of a plurality of nozzles for ejecting ink, and a material to be printed. A control unit for ejecting ink in synchronization with the movement of the print head,
In an inkjet recording apparatus having a development processing unit that receives print data from a host computer, expands the print data and converts the print data into raster data, and a mechanism unit that enables double-sided printing on the printing target, There is a means for separately designating the resolution for the front side and the back side of the printed matter, and according to the designation of the resolution, the front side and the back side of the printing medium are controlled to be printed at different resolutions.

In addition to the above configuration, it is preferable to have means for separately designing print densities on the front side and the back side of the printing object, so that the front side and the back side of the printing object are printed at different printing densities in accordance with the designation of the printing density. It is good to control to. Alternatively,
The print density or resolution of the front and back sides can be specified by the instruction from the operation panel or from the host computer.
It should be changeable.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A printing apparatus and a control method as an example of the present invention will be described with reference to FIGS.

FIG. 2 shows a block diagram of the ink jet controller of the present invention. The double-sided printing resolution setting process 2 is newly added to the inkjet controller of the conventional inkjet recording apparatus. In the double-sided print resolution setting process 2, a double-sided print resolution input process is newly added to the panel process 8 and has a function of inputting the front side resolution and the back side resolution from the panel, and the input resolution is stored in the double sided print resolution storage table. The function to save to is added.

Next, regarding an example of the expansion processing of the print control,
This will be described with reference to the expansion processing explanatory diagram of FIG.

In the expansion processing, like the conventional processing, first, data is read from the reception buffer (S001), the read data is analyzed by analysis processing (S002), and raster data for one page is written in the frame memory (S003). Next, in the print resolution conversion process 1 newly added in this example, it is determined whether the developed data and the resolution input in the double-sided print resolution setting process 2 described in FIG. 2 are the same (S004). If the same, the print start instruction process (S006) is executed as in the conventional process. If they are different, in the resolution conversion process (S005), the expanded print data is converted to have the resolution input in the double-sided print resolution setting process 2 described above. After the conversion is completed, the print start instruction process (S006) for instructing the print operation for one page is executed as in the conventional process, and the expansion process is ended.

By controlling in this manner, when double-sided printing is performed on a sheet having only one side applied for ink jet printing, even if data of the same resolution is sent from both sides of the host computer, different resolutions are used for the front and back sides. By having the function of designating the print speed and the function of converting the resolution in the expansion processing, it is possible to perform good printing without blurring on the surface not processed for inkjet.

In the above-mentioned example, the case where double-sided printing is performed at different resolutions has been described, but the same effect can be obtained by changing the development conditions for the front surface and the back surface according to the print density instead of the resolution. You can For example, by lowering the print density on the back surface as compared to the front surface, the amount of ink adhering to the back surface can be reduced, and as a result, bleeding on the print surface of printing can be suppressed.

In the above description, the print conditions such as the resolution and the print density are set from the operation panel. However, the print condition of each page is included in the header part of the print data transmitted from the host computer, and the print of the header part is performed. The same effect can be obtained by controlling each page to be printed according to the conditions.

In the above-mentioned example, the case of the line type ink jet recording apparatus has been described, but the same applies to the case of the serial type. That is, in the line system, a print head having a length corresponding to the width of the print object is used, the print object is moved without moving the print head, and ink is ejected from the print head in synchronization with the movement amount. In contrast to the printing method, the serial method
This is a method in which the carriage is moved while the printing object is stationary, and ink is ejected from the print head in synchronization with the movement to perform printing. Even in the case of this serial type, bleeding occurs when double-sided printing is performed on the front side and the back side in the same print mode for a sheet of which only one side is processed for inkjet. The same effect can be obtained.

[0025]

EFFECTS OF THE INVENTION According to the present invention, by setting printing conditions of different resolutions and print densities on the front side and the back side to be printed, there is no bleeding even when double-sided printing is performed on a paper which has only one side processed for inkjet. High quality printing is possible. Further, even if the printing conditions on the front surface and the back surface are different, it is not necessary to reload the paper or reset the printing conditions, so that there is an effect that the working efficiency does not decrease.

[Brief description of drawings]

FIG. 1 is a flowchart showing an example of expansion processing of the present invention.

FIG. 2 is a controller configuration diagram of an inkjet recording apparatus as an example of the present invention.

FIG. 3 is a schematic configuration diagram of an inkjet recording apparatus.

FIG. 4 is a flowchart showing an example of conventional expansion processing.

FIG. 5 is a controller configuration diagram of a conventional inkjet recording apparatus.

FIG. 6 is an explanatory diagram of print data for double-sided printing.

[Explanation of symbols]

Reference numeral 1 is a print resolution conversion process, 2 is a double-sided print resolution setting process, 13 is an inkjet recording device, 14 is a drying mechanism unit, 15 is a print head, 16 is printing paper, and 17 is a tractor.

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 2C055 KK00 KK02 KK10 KK11                 2C056 EA05 EA09 EC07 EC72 EC78                       EC80                 2C087 AA16 AC07 BA03 BA12 BC05                       BD05 CB12

Claims (5)

[Claims] 1. An ink having one or a plurality of print heads composed of a plurality of nozzles for ejecting ink and a mechanism section for moving an object to be printed, the ink being synchronized with the movement of the object to be printed. A control unit for ejecting the print data, a development processing unit that receives print data from a host computer, expands the print data and converts the print data into raster data, and a mechanism unit that enables double-sided printing on the printing material. In an inkjet recording apparatus having the above, a means for separately designating a resolution for the front surface and the back surface of the printing object is provided, and according to the designation of the resolution, the front surface and the back surface of the printing object are controlled to print at different resolutions. Inkjet recording device. 2. An ink jet printer having one or a plurality of print heads composed of a plurality of nozzles for ejecting ink and a mechanism section for moving an object to be printed, the ink being synchronized with the movement of the print head. And a developing unit that receives printing data from a host computer, expands the printing data and converts the printing data into raster data, and a mechanism unit that enables double-sided printing on the printing material. In the ink jet recording apparatus having the above, it has a means for separately designating a resolution on the front surface and the back surface of the printing object, and according to the designation of the resolution, controlling to print the front surface and the back surface of the printing object at different resolutions. Characteristic inkjet recording device. 3. The ink jet recording apparatus according to claim 1, further comprising means for separately designating a print density on the front surface and the back surface of the printing object, and according to the designation of the printing density, the front surface and the back surface of the printing object. The inkjet recording apparatus is characterized in that it is controlled so as to print at different print densities. 4. The ink jet recording apparatus according to any one of claims 1 to 3, wherein the print density or resolution of the front surface and the back surface can be changed by an instruction from an operation panel. 5. The ink jet recording apparatus according to any one of claims 1 to 3, wherein the print density or resolution of the front surface and the back surface can be changed by an instruction from a host computer.