JP3185106B2 - Ink amount adjustment data creation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[Industrial applications]

The present invention relates to an ink amount adjustment data creating apparatus, and more particularly, to an apparatus for automatically creating a picture area ratio for controlling an ink adjustment key in an offset printing press.

[0002]

[Prior art]

Before performing printing by a printing machine, predetermined preparations are required. Usually, the preparatory work proceeds through the following steps. First, imposition is performed on required printing specifications using characters, figures, photographs, and data. This imposition work is performed by data manipulation digitized on a color monitor by a layout device. The laid-out data is given to a printing plate machine, and the printing plate is formed on the printing plate by exposure with a laser beam or the like. A device for forming a printing plate by directly inputting printing plate data (print data) from the layout device to a printing press is known as a direct printing plate machine. On the other hand, in order to perform printing on a printing press, it is necessary to adjust the ink according to the pattern. Conventionally, the prepared plate is set on a pattern area ratio meter, and the pattern area ratio is calculated from the pattern on the plate. (See, for example, JP-A-57-73610 and JP-A-60-52342). The obtained pattern area ratio is used as control data of an ink adjustment key of the printing press.

[0003]

[Problems to be solved by the invention]

As in the conventional case described above, obtaining a pattern area ratio from a printing plate once created by using a special device such as a pattern area ratio meter leads to a complicated device configuration, a complicated operation, and
There is a problem in that a lot of work time is required for preparation. SUMMARY OF THE INVENTION It is an object of the present invention to provide an ink amount adjustment data generating apparatus capable of effectively activating print data used in pre-preparation work, simplifying the apparatus, and improving work efficiency.

[0004]

[Means for Solving the Problems]

The present invention imposes printing information on a layout state to be printed in a printing press using image data, character data, and layout data, and performs imposition printing including pixel data representing multiple gradations with one pixel. Print data creation means for creating data, the number and width of ink adjustment keys, plate size,
And directly inputting the pixel data of the imposed print data using a printing parameter representing an effective area or an image area of the plate, and an area of an image area corresponding to an ink adjustment key. Is calculated based on the ratio of the average value of the pixel data in the image area corresponding to each ink adjustment key to the maximum value that can be taken by one pixel of the pixel data. Computing means for outputting data.

[0005]

[Action]

According to the present invention, the print data creation unit impositions the input print information so as to conform to a predetermined specification, and creates imposed print data including pixel data representing multiple gradations with one pixel. The print data output from the print data creating means is given online to the arithmetic means. The calculating means calculates the pattern area ratio based on the given print data. The calculated pattern area ratio data is provided to the ink conditioner. As described above, in the present invention, it is possible to directly calculate the pattern area ratio from the print data created by the print data creating means, instead of calculating the pattern area ratio from the printing plate, thereby simplifying the device configuration and performing the preparatory work. Efficiency can be improved.

[0006]

【Example】

Next, a preferred embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows an embodiment of the present invention. As shown in FIG. 1, the ink amount adjustment data creation device includes a print data creation unit 1 and a calculation device 6. The print data creation unit 1 includes image data D _A and character data D _B
And allocation data D _C, and each of these data D _A ,
D _B, the computer to create outputs print data D _OUT based on D _C is (hereinafter, referred to. CPU) has two. The print data D _OUT is data of a unit to be printed (usually imposed data). The print data creation unit 1 stores the print data
And a disk 4 for storing various data and print data D _OUT of the color monitor 3 is used, and is input to create and checking the D _OUT. Print data created
D _OUT is sent to the printing process.

The printing process can be roughly classified into two modes. First, when print data _DOUT is output to a film, the printing process is a process of creating a printing plate from the film. This printing plate is attached to the printing press 12. The other is a case where a direct printing press 10 is used, and FIG. 1 shows an example in which the direct printing press 10 is used. In the case of this direct printing press 10, the CPU 21
Print data D _OUT output from is sent directly to the direct printing plate machine 10, the plate is created. The created printing plate is attached to the printing press 12 and is subjected to printing.

The arithmetic unit 6 has an arithmetic unit 7 for calculating a picture area ratio and a memory 8 for storing data necessary for the calculation. The arithmetic unit 6 can be configured using a personal computer. The arithmetic unit 7 is a CPU, and the memory 8 is a RO.
Applicable to M or RAM. In the memory 8, parameters for each printing press are registered. The parameter is, for example, a value as shown in FIG. The reason for registering these print parameters is that the number and width of ink adjustment keys, the plate size, the effective area of the plate, and the like differ depending on the printing press. Machine can cope. The parameters for the unregistered printing press may be input by the input device 5 as needed.

Here, the calculation formula of the picture area ratio by the calculation unit 7 is (1)
This is shown in the equation and will be described with reference to FIG. That is, the image area ratio is calculated by the ink adjusting machine 13 after all.
It is necessary to determine the key opening degree for each ink adjustment key, and as shown in FIG. 4, the pattern area ratio is determined for each width of an arbitrary (for example, m-th) ink adjustment key. The pattern area ratio of the m-th ink adjustment key is ((correction value) × (average value of pixel data in K region) /
(Maximum value that one pixel of plate data can take)) x 100
(%) ... (1) Here, (correction value) = a / A (≦ 1). a is the length of the image portion, and A is the length of the printable portion.
K indicates an image area corresponding to the m-th ink adjustment key.

The arithmetic unit 7 reads out parameters from the memory 8 as appropriate according to the printing machine number D input from the input device 5, takes the values into account, and uses the print data D _OUT from the CPU 2 to print the pattern area. calculating the rate, and outputs the write unit 9 as an ink adjustment data D _I.

[0011] The write unit 9 is a magnetic card writer for writing ink adjustment data D _I to the magnetic card 11, the ink adjustment data D _I This write is retained in the magnetic card 11.

A plurality of printing presses 12 are provided, and each printing press 12 is provided with an ink adjustment machine 13 for adjusting an ink adjustment key. Is connected to the reader 14 to each ink regulator 13, the ink adjustment data D _I of the magnetic card 11 is read by the reading device 14 of the printing machine 12 to be used, an ink regulator 13
And the opening of the ink adjustment key is set to the required printing specification.

Next, the operation of FIG. 1 will be described. Print data creation unit 1
Thus, predetermined print data _DOUT is created by inputting data such as characters, figures, and photographs. Created print data D _OUT
Is sent to the direct printing plate machine 10 to be used for preparing a printing plate, and is also sent to the arithmetic unit 6. The calculation unit 7
Printing machine provided from the input device 5, with the number and the print data D _OUT registration parameters (FIG. 2) corresponding to the printer ID to create the ink adjustment data D _I, transferred to the write device 9. Write device 9 writes the ink adjustment data D _I to the magnetic card 11. This completes the pre-preparation work.

[0014] Then, during printing, it sets the opening degree of the ink adjustment key by which to set the magnetic card 11 to the reader 14 of the printing machine 12 used gives the ink adjustment data D _I to the ink regulator 13. On the other hand, the printing plate 10 is set on the plate cylinder of the printing press 12 using the printing plate 10, and printing is started.

[0015] Thus, since the arithmetic unit 7 calculates an image area ratio is captures and print data D _OUT from the print data preparation unit 1 directly outputs the ink adjustment data D _I, as in the prior art, the Each time, there is no need to find the pattern area ratio from the printing plate,
It is not necessary to set the pattern area ratio, the number of personnel for the measurement can be reduced, and the work time can be shortened, so that the efficiency of the preparatory work can be improved as a whole.

[0016] In the above embodiment, the ink adjustment data D _I
Is stored in the magnetic card 11 and the ink adjustment machine is offline
13, the data may be transferred on-line by providing a data bus. Further, in the above embodiment, the arithmetic unit 7 is provided separately from the print data creation unit 1, but the CP of the print data creation unit 1
It may be provided inside using U2. Also, when print data is output to a film, the present invention can be applied since the position of the film when creating a printing plate is determined by the pin system.

[0017]

【The invention's effect】

As described above, according to the present invention, the imposed print data composed of pixel data representing one pixel and representing multiple gradations generated by the print data generating means is effectively used, and the pattern area ratio is directly calculated by the calculating means. This eliminates the need for a special device such as a pattern area ratio meter, and saves labor and time required for operating the device.

[Brief description of the drawings]

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

FIG. 2 is an explanatory diagram showing an example of registered printing press parameters.

FIG. 3 is an explanatory diagram of calculation of picture area ratio data.

[Explanation of symbols]

 1 Print data creation unit 2 CPU 3 Color monitor 4 File 5 Input device 6 Computing device 7 Computing unit 8 Memory 9 Writing device 10 Direct printing plate Machine 11: Magnetic card 12A-12N Printing machine 13A-12N Ink conditioner 14 Reader

Claims (1)

(57) [Claims] 1. A printing apparatus according to claim 1, wherein printing information is imposed on a layout state to be printed by a printing press using image data, character data, and layout data, and one pixel includes pixel data representing multiple gradations. Using print data creation means for creating print data, the number and width of ink adjustment keys, plate size, and print parameters representing the effective area and the image area of the plate, By directly inputting the pixel data, the image area ratio of the area of the image area corresponding to the ink adjustment key is changed to the image area corresponding to each ink adjustment key with respect to the maximum value that one pixel of the pixel data can take. A calculating means for calculating based on the ratio of the average value of the pixel data in the area, and outputting the calculated picture area ratio data.