JPH0241248A - Ink amount setting processing device for inking device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an ink amount setting processing device for adjusting the ink amount of an inking device in a printing press, particularly a multicolor offset printing press.

[Conventional technology]

In recent years, various automation and labor-saving devices have been developed in various parts of printing presses.

In the inking device of an offset printing press, a preset-type ink amount setting processing device has been put into practical use that automatically sets the blade opening degree based on the image area ratio measurement data of the printing plate, with the aim of automating color matching work and saving labor. ing.

The conventional technology will be explained with reference to FIGS. 5 to 9.

FIG. 5 shows the main parts of a four-color offset printing press.

In Fig. 5, the four-color offset printing machine has four printing units UY, υH-UC, and UB, and the four printing units UY, UH, Uc, and UB are yellow (Y), magenta (M), and cyan, respectively. A printing plate in charge of (C) and black (B) is attached.

Furthermore, each unit has an inking device I, 1. which adjusts the amount of ink supplied. 1 and I are respectively set HCB.

v, I have the same structure Each inking device1. IH, Io 8 Because it is a precept, 1. This will be explained using an example.

FIG. 6 shows the main parts of the inking device I.

The inking device IY includes an ink source roller 2 and a blade 4. The ink source roller 2 and the blade 4 constitute an ink fountain 3, and yellow (Y) ink is stored in the ink fountain 3.

As shown in FIG. 7, the blade 4 is divided into blades B1 to Bn in the axial direction of the ink source roller 2. As shown in FIG.

The amount of ink supplied is adjusted by the relative gap between the tip of the blade and the outer peripheral surface of the ink source roller 2, that is, by the size of the ink fountain opening.

The total number n of unit blades is the same as the total number of divided areas A1 to An for measuring the picture area ratio of the printing plate 5 shown by broken lines in FIG.

The image area ratio (%) is the image line density in a certain area of the printing plate expressed as a percentage, and is measured using a printing plate area ratio meter.

Next, the ink amount setting device will be explained.

Based on the above pattern area ratio data, the ink amount setting device
Each ink set! The conventional ink amount setting device 70 controls 14C of I, I, I, I, and as shown in FIG. It is composed of means 8 and correction input means 14.

Here, the input means 9 is connected to the picture area ratio meter 6, receives measurement data as input data via a magnetic card, etc., and transfers the input data to the conversion calculation means 10. The conversion calculation means 10 calculates the picture area ratio RA (%) as shown in FIG. 11 based on the conversion data D, DH, Dc, and DB for each color in the conversion function memory 1 as shown in FIG.
is converted into an ink fountain opening degree O1 (%) corresponding to the ink fountain opening degree O1 (%), and is transferred to the ink fountain control means 8. The ink fountain control means 8
is based on the ink fountain opening data 01 (%), and each inking device 1 for each printing unit, UY, UH, Uc, and UB.
, IH, Ic 8 y , I to control the ink supply amount. Further, the correction input means 14 inputs data from a keyboard or the like to perform fine adjustment when the ink supply amount does not reach the optimum condition by the ink fountain control means 8.

In this way, each printing unit 1 to U Y , U Hl
Each of the inking devices 1, 1 . I, CB
The amount of ink supplied from the YHC I8 is set to match the pattern on each printing plate.

[Problem to be solved by the invention]

In the conventional ink amount setting device described above, the ink supply amount is set only based on the image area ratio data to be printed.
When the same printing machine prints different types of prints one after another, the amount of ink supplied from the previous printing is not taken into account. If a large amount of ink remains in the ink, an excessive amount of ink may be supplied to a new printed matter at the start of printing if the ink fountain opening degree calculated and set based on the pattern area ratio data to be newly printed is maintained. In such cases, it takes time for the ink supply amount to become optimal, and depending on the situation, it may be necessary to manually adjust the ink fountain opening, and furthermore, it takes a large amount of time to reach the optimal ink supply amount. There was a problem that paper wasted.

Therefore, the present invention makes it possible to automatically set the optimum ink supply amount in a short time even when printed matter with different designs are printed one after another on the same printing machine, thereby minimizing the occurrence of paper waste. An object of the present invention is to provide an ink amount setting processing device for an inking device.

[Means to solve the problem]

In order to solve the above problems, the present invention provides an ink fountain with blades in the width direction of the ink source roller, and individually controls the blades based on a conversion function preset from the picture area ratio of the printing plate. Then, in the one-reset type ink amount setting processing device of the inking device that adjusts the amount of ink supplied, it is calculated from the ink supply amount from the previous printing plate and the image area ratio data of the printing plate to be printed this time. If the previous ink supply amount is greater than the current ink supply amount, the ink fountain opening degree is set to O (%) for a predetermined time according to the difference, and printing is continued for a certain period of time. After the machine is operated, the ink fountain opening degree is set based on the picture area ratio, and when the ink fountain opening degree is less than or equal to the picture area ratio, the ink fountain opening degree is immediately set to the ink fountain opening degree based on the picture area ratio.

[Effect]

When the ink amount setting processing device of the inking device of the present invention receives the pattern area ratio measurement data measured from the printing plate of the pattern to be printed, the ink amount setting processing device of the inking device of the present invention uses the conversion data set in advance by the arithmetic conversion means to control the ink fountain. Convert to Opening 9 Next, read the ink fountain opening from the previous printing using a different printing plate, compare it with the ink fountain opening for the current printing, and find out that the ink fountain opening for the current printing is greater than the ink fountain opening for the previous printing. If the ink is small, operate the printing press with the ink fountain opening degree at 0 (%) for a certain period of time based on the preset operation time calculation table, remove the excess ink remaining in the roller group, and then By setting the ink fountain opening degree calculated by the arithmetic conversion section, operation is performed with the ink supply amount being optimized.

In this way, even when printing different patterns one after another on the same printing machine, the optimal ink supply amount can be automatically set in a short time, minimizing paper waste. can.

〔Example〕

Next, one embodiment of the ink amount setting processing device according to the present invention will be described with reference to FIGS. 1 to 3.

FIG. 1 shows a diagram explaining the principle of the present invention.

In FIG. 1, the ink amount setting processing device is comprised of input means, conversion calculation means, conversion function memory, comparison and judgment means, output means, ink fountain control means, and auxiliary input means. In FIG. 1, parts that overlap with those in FIG. 9 (prior art) are given the same reference numerals, and detailed explanations will be omitted below.

The differences between this embodiment shown in FIG. 1 and the conventional example shown in FIG. 9 are as follows:
This is a comparison/judgment means 13.

The comparison/judgment means 13 compares the ink fountain opening calculated by the conversion calculation means 10 with the ink fountain opening of the previous printing using a different printing plate, and determines the ink fountain opening setting;
When the ink supply is likely to be excessive, the output means 12
Instructs the ink fountain control means 8 to maintain the ink fountain opening degree of the corresponding blade at 0 (%) for a certain period of time (hereinafter referred to as preset operation time).

In accordance with the instruction, the ink fountain control means 8 maintains the ink fountain opening degree of the specific blade at 0 (%) during the preset operating time.

Next, the operation of this embodiment will be explained with reference to FIG.

FIG. 2 shows a flowchart of this embodiment.

Sugg St) In this step, pattern area ratio measurement data is input.

The measurement data of the pattern area ratio is recorded, for example, in the magnetic card 22 as shown in FIG. 3 in a format corresponding to each divided area A1 to An of the printing plate 5 for each printing item (a). It is input by input means 9 (in this case, a magnetic card reader). The measurement data of the picture area ratio input in this way is transferred to the conversion calculation means 10.

Step 32) In this step, a conversion operation is performed.

The conversion calculation means 10 calculates each ink fountain opening degree of 0.00000000 corresponding to the transferred image area ratio measurement data according to the conversion function shown in FIG. Calculate.

Step 33) In this step, the ink fountain opening data of the previous printing is read.

Ink fountain opening data from the previous printing using a separate printing version
d is read from the ink fountain control means 8 for each unit blade B, B2, . . . Bo of each ink fountain.

Step 34) In this step, ink fountain opening data are compared.

The ink fountain opening data O6 calculated in S2 is compared with the ink fountain opening data Opd from the previous printing using a different printing plate read in S3.

1) When Opd>Od Processes S5, S6, and S7 shown below are performed.

2) If Opd≦Od, perform the process of S8 shown below. That is, since the ink supply amount is increased, the ink fountain opening degree is immediately set to the opening degree corresponding to the picture area ratio.In this step, 1 m during the glissetting operation is calculated.

Ink fountain opening data Od and ink fountain opening data from the previous printing 0. d is calculated, and the preset operation time is calculated using, for example, a preset operation time calculation table that sets the ink fountain opening degree to O (%) as shown in FIG. In other words, if the difference in opening is small, the opening of the ink fountain is set to 0 (
%), and if the difference is large, increase the time.

The preset operation time calculation table shown in FIG. 4 needs to be rewritten as necessary through self-learning or the like.

Step 36) In this step, the ink fountain opening degree is set to O (%).

In order to remove the ink remaining in the roller group in the printing unit during the previous printing using a different printing plate, the ink fountain control means is operated for the time calculated in S5 and the ink fountain opening degree is set to 0 (%). .

Step 37) In this step, the printing press is operated with the ink fountain opening degree O (%).

The printing press is operated at the ink fountain opening degree O (%) for the preset operating time calculated in S4. Printed matter during this period becomes waste paper.

Step S8) In this step, the ink fountain opening degree is set to the preset calculation value.

Based on the information from the input means 9, the ink fountain opening degree is set to the ink fountain opening degree Od calculated in S2.

As described above, the optimal ink supply amount can be automatically set in a short time.

〔Effect of the invention〕

Since the present invention is configured as described above, excess ink remaining in the printing unit roller group can be quickly removed, and even immediately after replacing the printing plate, the optimum ink can be automatically set in a short time. The supply amount can be set, which saves workers' manual adjustment time and test printing time, improves print quality, and minimizes paper waste. play.

-Pull, surface 5 is a schematic diagram of the main parts of a 4-color offset printing machine,
Fig. 6 is a schematic diagram of the main parts of the inking device, Fig. 7 is a schematic diagram of the blade, Fig. 8 is an explanatory diagram of dividing the printing plate for measuring pattern area ratio,
FIG. 9 is an explanatory diagram of the principle of the conventional example, FIG. 10 is an explanatory diagram of conversion data in the conversion memory, and FIG. 11 is an explanatory diagram of data conversion.

2... Ink source roller, 3... Ink fountain, 4...
-Blade, 6...Picture area ratio meter, 7...Ink amount setting processing device, 8...Ink fountain control means, 9...
Input means, 10... Conversion calculation means, 11... Weird JA
Function memory, 12... Output means, 13... Comparison/judgment means, 14... Correction input means, 22... Magnetic card, 70... Ink amount setting device, 81-S8... Setting processing .

[Brief explanation of the drawing]

FIG. 1 is a diagram explaining the principle of the present invention, FIG. 2 is a processing flowchart according to the present invention, FIG. 3 is a schematic diagram of the image area ratio data recording format in a magnetic card, and FIG. 4 is a preset operation according to the present invention. Time Calculation Applicant's Representative Yasushi Ishikawa (b) Figure 3 Figure 6 Figure 1 Figure 9

Claims (1)

[Claims] An ink fountain having a blade is provided in the width direction of the ink source roller, and the blades are individually controlled based on a conversion function set in advance from the picture area ratio of the printing plate to control the amount of ink supplied. The preset-type ink amount setting processing device of the inking device to be adjusted compares the ink supply amount of the previous printing plate with the ink supply amount of the printing plate to be printed this time, and determines the previous ink supply amount. If the ink supply amount is larger than the current ink supply amount, the ink fountain opening is set to 0 (%) for a predetermined time according to the difference, and after a certain period of operation, the ink fountain opening is set to the ink fountain opening based on the picture area ratio. An ink amount setting processing device for an inking device, characterized in that when the amount is less than or equal to the amount, the ink fountain opening degree is immediately set based on the pattern area ratio.