JPS62170346A - Ink supply controller for printing press - Google Patents

Abstract

PURPOSE:To make it possible to obtain a printing area ratio in the step of editing a printing surface and to set an appropriate ink supply quantity, by a system wherein the content of a file part containing dot images is divided in a printing width direction into a plurality of divisional areas, and the ratio of printing area to non-printing area is calculated for each of the divisional areas. CONSTITUTION:The content of a machine plate surface (e.g., each page of a newspaper) edited by a terminal unit 2 is converted into character codes, which are stored into a makeup file part 3, then the content of the file part 3 is converted into dot images (for example, a printing area is assigned '1' while a non-printing area is assigned '0'), which are stored into a paper file part 4. A central controller 1 divides each dot train thus stored in the printing width direction into a plurality of regions, sums up the number of bits '1' corresponding to the printing area for each of the divisional regions, and calculates a printing area ratio by dividing the number of the bits '1' by the total number of bits in the divisional region. Based on the printing area ratios, an ink-supplying means 8 is controlled through an ink supply controlling panel 7.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an ink supply control device for a printing press.

In particular, an ink supply control device having an ink adjustment means that adjusts the ink supply amount according to the print area of the printing plate surface is equipped with a terminal device for editing the printing plate surface, and the content edited by the terminal device is used for printing. Printing configured to perform a plurality of divisions in the width direction, calculate the line ratio for each divided plane, and adjust the ink supply amount for each divided plane based on the line ratio. This invention relates to an ink supply control device in a machine.

[Conventional technology]

For example, there is a device for setting the ink supply amount of a printing press.
1 (Published by Japan Newspaper Association), pages 39 to 41
As disclosed on the page, the method detects the actual printing surface density at each division as appropriate in the width direction of the printing plate, and sets the ink supply amount by comparing the data with a preset standard density. Or, as disclosed in Japanese Patent Publication No. 56-24634, a plate-making film is prepared, and the film is sandwiched between a light emitter and a photoreceptor made of a photoelectric converter,
A method that extracts the amount of light transmitted through the film as an analog signal using a photoreceptor, converts this into digital image area ratio data via an A/D converter, and sets the ink supply amount according to the image area ratio. It has been known.

[Problem that the invention seeks to solve]

Among the conventional methods mentioned above, in the method of measuring the printing surface density and setting the ink supply amount, a so-called trial printing is performed before printing starts, and the ink supply amount is determined by checking the printing surface density obtained by the trial printing. I try to set the amount. That is, in this method, the ink supply amount cannot be set before printing starts. Therefore, there is a problem in that the above-mentioned trial printing has to be performed each time the printing surface is changed. On the other hand, in a method in which a plate-making film is sandwiched between a light emitting body and a light receiving body, and the ink supply amount is set by obtaining the print area ratio from the amount of light transmitted, the ink supply amount can be set before printing starts. Although the above-mentioned problems with the method of measuring the printed surface density are solved, the work of measuring the 9-line ratio can be done for all printed surfaces, that is, for newspaper printing, for example, for all pages of a newspaper. Furthermore, each time the layout of each page is changed, it is necessary to manually perform the above-mentioned drawing ratio measurement work for each plate-making film in a short time so as not to interfere with either the upstream or downstream processes. , and must be handled in a manner that does not damage the film. Therefore.

There is an undesirable problem in that the operator is required to have a high degree of skill and is also forced to be under a heavy burden.

[Means for solving problems]

The present invention aims to solve the above-mentioned problems, and therefore, the ink supply control device for a printing press of the present invention includes an ink adjustment means for adjusting the ink supply amount in accordance with the printing area of the printing plate surface. In an ink supply control device in a printing press having a central control device that controls the ink supply control device.

The apparatus includes at least a terminal device for editing the printing plate surface, and a file section in which print information edited by the terminal device is stored in dot images.

The central control device divides the contents of the file section into a plurality of parts in the printing width direction, and calculates the ratio of the print area to the non-print area for each divided plane.

The invention is characterized in that the ink adjustment means is controlled so that the ink supply amount for each divided surface is set based on the ratio.

[Effect]

In the present invention, 1, for example, the entire printing plate surface is edited using a terminal device equipped with a display, and the print content edited by the terminal device is set to, for example, "1" for the printed area and "0" for the non-printed area. Dots converted to a matrix of bits
Save the image to a file. Then, the content of the file is divided into a plurality of parts in the printing width direction, and the number of bits of "1" indicating the above-mentioned image area is counted for each divided plane. Next, the line ratio is calculated by dividing the total number of bits by the total number of bits for each divided plane. Then, based on the image ratio, the ink supply amount is set for each of the divided surfaces. Therefore.

The present invention promotes significant rationalization of the printing process by automatically setting an appropriate ink supply amount at the editing stage of the printing plate surface.

〔Example〕

FIG. 1 is a schematic diagram of an embodiment of the present invention.

FIG. 2(A) is an explanatory diagram regarding the drawing information stored in the paper file section in the embodiment illustrated in FIG.

FIG. 2(B) shows an explanatory diagram regarding the manner in which the contents of the paper file section are divided. Reference numeral 1 in the figure is a central control unit (CPU), 2 is a terminal device (VDT) equipped with a display and used to edit print content, and 3 is the terminal device 2.
A large set file section 4 stores printed contents edited by converting them into character codes, and a paper file section 4 develops and stores the contents of the large set file section 3 as dot images.

Reference numeral 5 denotes a plotter for outputting the dot images stored in the paper file section 4 as required.

6 is a printer for outputting ink supply data as necessary; 7 is an ink supply control panel which controls ink supply means to be described later based on ink supply data from the central control unit 1;

8 represents an ink supply means.

In the embodiment shown in FIG. 1, the contents of the printing plate (for example, each member of a newspaper) edited by the terminal device 2 are converted into character codes and stored in the large set file section 3, and the contents of the large set file section 3 are further converted into character codes. It is converted into a dot image (for example, nine drawing areas are set to "1" and non-printing parts are set to "0") and stored in the paper file section 4. Then, the ratio of the image area (hereinafter referred to as the image area ratio) is calculated based on the contents of the paper file section 4, and the ink supply means 8 is controlled via the ink supply control panel 7 based on the image area ratio. Let's do it. below.

The operation of the embodiment shown in FIG. 1 will be explained in order with reference to FIGS. 2(A) and 2(B).

(1) First, a page to be printed (eg, page 1 of a newspaper) is edited using the terminal device 2 equipped with a display.

(2) Next, the central controller 1 converts the edited contents into character codes and stores them in the large set file section 3.

(3) Furthermore, the contents stored in the large set file section 3 are as shown in FIG. 2(A).

For example, it is converted into a matrix of bits in which the drawing part is set to "1" and the non-printing part is set to "0" and stored in the paper file section 4.

(4) The central control device 1 divides the matrix of dots stored in the paper file section 4 into a plurality of regions vI in the printing width direction (see FIG. 2B). (B)
In the illustrated embodiment, 8 of the first to eighth dividing surfaces
The number of "1" bits corresponding to the image area is totaled for each divided plane, and the line ratio is calculated by dividing the number of bits by the total number of bits of each divided plane. Partly, the line ratio corresponding to each of the first to eighth dividing planes is calculated. Then, based on the line ratio.

Ink supply data corresponding to the first to eighth dividing planes are output to the ink supply control panel 7.

(5) The ink supply control panel 7 controls the ink supply means 8 based on the ink supply data output from the central control device 1, and sets the ink supply amount to each of the first to eighth dividing surfaces. Let's do it.

The present invention makes it possible to automatically set an appropriate ink supply amount at the printing content editing stage by carrying out the steps (1) to 5) above.

In the embodiment shown in FIG. 1, it is also possible to output the contents stored in the paper file section 4 in the form of dot images by the plotter 5, and also to output the contents stored in the paper file section 4 in the form of dot images. It is also possible to output the ink supply data by the printer 6. and,
Based on the output data, the ink supply amount may be set by adjusting the ink supply means 8 by two manual operations as shown by the dotted line in FIG.

In the embodiment illustrated in FIG. 1, the print content edited by the terminal device 2 is converted into character codes and temporarily stored in the large set file section 3, and then the contents of the large set file section 3 are converted into dot image format. Convert to paper file section 4
However, the present invention is not limited to this, and the above-mentioned large set file section 3 is omitted,
The print content edited by the terminal device 2 is displayed as a dot.
Directly convert it into image form and send it to the above paper file section 4.
It may be stored in . Furthermore, even if the plotter 5 and printer 6 are omitted, the basic effects of the present invention will not be affected.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to obtain the line ratio at the editing stage of the printing surface.

An appropriate ink supply amount can be set. Therefore,
Since it is not necessary to perform the work of setting the print area ratio and ink supply amount, which has been conventionally performed, for example, using a plate-making film, the ink supply amount setting process can be significantly shortened. This not only has a significant effect on management costs, but also for printed materials such as newspapers, which require up-to-date information down to the minute and second. This is extremely important and has great effects.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of an embodiment of the present invention. FIG. 2(A) is an explanatory diagram regarding the drawing information stored in the paper file section in the embodiment illustrated in FIG. FIG. 2(B) shows an explanatory diagram regarding the manner in which the contents of the paper file section are divided. In the figure, 1 is a central control unit, 2 is a terminal device, 3 is a large file section, 4 is a paper file section, 5 is a plotter, 6 is a printer, 7 is an ink supply control panel, and 8 is an ink supply means. Patent applicant Tokyo Kikai Seisakusho Co., Ltd. Patent attorney Mori 1) Hiroshi (and 2 others) Figure 1

Claims (1)

[Claims] In an ink supply control device for a printing press having an ink adjustment means for adjusting an ink supply amount in accordance with the print area of a printing plate surface, a central control device that controls the ink supply control device, and a terminal device that edits the printing plate surface. , and at least a file section in which print information edited by the terminal device is stored in the form of dot images, and the central control device divides the contents of the file section into a plurality of parts in the printing width direction, and divides each of the divided parts into a plurality of parts in the printing width direction. The ink adjustment means is controlled so that the ratio between the printed area and the non-printed area is calculated for each divided surface, and the ink supply amount for each divided surface is set based on the ratio. An ink supply control device for a printing press, characterized in that: