JP2721171B2 - Ink amount setting device for inking unit - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing press, and more particularly, to an ink amount setting device for a multicolor offset printing press.

2. Description of the Related Art A multicolor offset printing machine performs color printing. For example, as shown in FIG. 9, in the case of four-color printing, yellow (Y), magenta (M), cyan (C), and four printing units U _Y of the plate having undergone respective colors are mounted respective black _{(B), U M, U} C, configured with a U _B. Each printing unit _{U Y, U M, U C} , inking unit 1 to U _B for adjusting the supply amount of the ink _{Y, 1 M, 1 C,} 1 B , respectively.

Here, FIG. 10 shows a main part of the inking device. Each inking unit 1 _Y to 1 _B because the same configuration will be described with the 1 _Y as an example.
The inking device _1Y includes an ink source roller 2 and an ink fountain 3 disposed adjacent to the side of the outer peripheral surface of the ink source roller. The amount of ink is adjusted by the degree of opening of the ink fountain formed by the relative gap between the tip of the bottom plate 4 of the ink fountain 3 and the outer peripheral surface of the ink source roller 2. The ink fountain bottom plate 4 is divided into a predetermined number of the axial direction of the ink fountain roller 2, the divided bottom plate (hereinafter, referred to as a blade.) B ₁ ~B _n is pot opening individually and independently is adjustable . The number of each blade B ₁ ~B _n (i.e. the number of divisions of the bottom plate 4), the 11th division area Ar for picture plate area ratio measurement of the plate 5 shown by broken lines in FIG.
It corresponds to the number from _{1 to} Ar _n . This pattern area ratio is measured by a plate pattern area ratio meter. The above-described ink device _1Y is controlled by an ink amount setting device that receives the measurement data of the picture area ratio as an input.

Next, a conventional ink amount setting device will be described with reference to FIG. The conventional ink amount setting device uses a picture area ratio meter 6
The measurement area data is used as input data, and the pattern area ratio (%)
Control and conversion unit 7 to convert the pot opening (%) corresponding with a preset conversion function, an adjusting device for the blades B ₁ .about.B _n of ink fountain 3 based on the converted pot opening data And an ink amount control unit 8 for controlling the amount of ink.

The pattern area ratio meter (DEMIA (registered trademark of Dai Nippon Printing Co., Ltd.) 6 is used to determine the amount of ink (that is, the pattern area ratio) required for the color matching of the multicolor offset printing from the distribution of the pattern on the printing plate 5 by optical. The pattern area ratio is measured for each printing plate (Y, C, M, and B colors), and the measured value is output by a medium such as a magnetic card or printed out. An input unit 9 for inputting measurement data of the picture area ratio meter 6, and conversion function data D _Y , D _M , D _C , and D _B for each color (Y, C, M, B) (see FIG. 13) And a conversion function memory 10 for storing the degree of opening of the corresponding color pot based on the input pattern area ratio measurement data.
A conversion operation unit 11 for performing a conversion operation by reading out from the printer, an output unit 12 for outputting the conversion data, and an inverse conversion for converting the data of the fountain opening degree from the ink amount control unit 8 into a picture area ratio based on the conversion function memory 10. It comprises an operation unit 13 and an output unit 9 'for outputting the data inversely transformed by the inverse transformation operation unit 13.

As shown in FIG. 14, the conversion function data is represented by the picture area ratio (%) on the horizontal axis and the pot opening 100 (%) on the vertical axis, and each printing unit U _Y , U _M , It is set for each of U _C and U _B (that is, for each color).

The ink amount control unit 8 converts the fountain opening data into the printing units U _Y to
And outputs to the inking unit 1 _Y to 1 _B of U _B.

Next, the operation of setting the ink amount when printing a certain pattern will be described.

First, each printing plate 5 (Y, C, M, B) by the pattern area ratio meter 6
Are measured. This pattern area ratio measurement data is input to the conversion unit 7 via the input unit 9. As for the input method, in the case of a magnetic card, the input unit 9 is automatically read as a magnetic reader, or in the case of printout data, the input unit 9 is manually input as a keyboard. The input pattern area ratio measurement data is input to the conversion operation unit 11.

Conversion calculation unit 11 outputs the pot opening degree corresponding the conversion function memory 10 to the conversion function data D _Y to D image area ratio that is input to reads _B corresponding to each 5 each plate to the output unit 12.
The converted pot opening data is input to the ink amount controller 8. The ink amount control unit 8 each printing unit of the pot opening command individually in correspondence with the printing plate _{5 U Y, U M, U} C, inking unit 1 _Y of _{U B, 1 M, 1 C} , 1 B ( (Not shown). Each ink unit
_{1 Y, 1 M, 1 C} , 1 B open blades B ₁ .about.B _n of ink fountain 3 to fit the pot opening command given to self. However,
If the pot opening obtained as described above is not optimal, the operator manually adjusts the individual blades B _{1 to} B _n individually using the keyboard of the correction input unit 14 or the like. Each printing unit U _Y In this operation, U _M, U _C, inking unit 1 _{U B Y, 1 M, 1} C,
1 The amount of ink kneaded from _B is the corresponding printing plate 5 (Y, M,
The amount is set to match the pattern of (C, B).

[Problems to be solved by the invention]

The above problem in the conventional ink quantity setting device, vases each inking unit _{1 Y, 1 M, 1 C} , 1 ink fountain bottom plate 4 and the ink fountain roller 2 in _B is over time deteriorates due to wear or the like, initially set A deviation occurs between the opening and the actual pot opening,
The point is that the print quality must be reduced.

The change over time of the pot opening can be dealt with by changing the conversion function and resetting the pot opening, however,
This reconfiguration is for the ink fountain bottom plate 4 the whole opening, but not the ink fountain bottom plate 4 for each individual Buredodo B ₁ ~B _n. Abrasion of the ink fountain bottom plate 4 and the ink source roller 2 does not always occur uniformly over the entire area in the width direction, but may occur locally. If there is significant local wear, the corresponding blade (B ₁
To _Bn ) is replaced with a new one for maintenance. In this case, readjustment is required to balance the pot opening with other blades which are still old. This readjustment is carried out for each blade B ₁ .about.B _n, since occurring subtle characteristic difference in each blade B ₁ .about.B _n mutually and can not be recovered easily optimum state.
In addition, re-adjustment requires a great deal of time and effort.

Thus, for each printing unit a pot opening in the conventional, since the set uniformly, corresponding to time course of pot opening occurring between the blades B ₁ .about.B _n mutual ink fountain bottom plate 4 There was a problem that it was not possible.

Therefore, an object of the present invention is to provide an ink amount setting device capable of setting an optimum fountain opening by applying a conversion function adapted to a pattern area ratio of a printing plate for each blade of an ink fountain bottom plate. I do.

[Means for solving the problem]

The present invention aims to solve the above-mentioned conventional problems, and in order to achieve the object of the present invention, as shown in FIG. 1, an ink in which a bottom plate 4 is divided into a plurality in the width direction of the ink source roller 2 is provided. For the ink amount setting devices of the ink devices 1 _Y to 1 _B using the fountain 3, the image area ratio measurement data of the printing plate is converted into the ink fountain opening data based on a predetermined conversion function, and the ink is set. in the ink quantity setting device for setting a Tsubono opening, characterized in that it has a conversion unit 15 in which the transformation function is set for each blade B ₁ .about.B _n of the bottom plate of the divided ink fountain is there.

[Action]

According to the configuration of the present invention, by inputting the measured pattern area ratio data, the blade B of each ink fountain bottom plate 4 is determined based on the conversion function corresponding to each of the divided areas for measuring the pattern area ratio of the printing plate. It is converted into a pot opening every _{1 to Bn} . It is possible to set an optimum pot opening for each blade B ₁ .about.B _n by the conversion data.

As described above, according to the present invention, the pot opening corresponding to the pattern area ratio can be directly set independently for each blade, so that the temporal change of the pot opening for each blade is dealt with. It is possible to improve the print quality and to save the trouble of adjusting the opening degree of the jar.

〔Example〕

Next, an embodiment of an ink amount setting device according to the present invention will be described with reference to the drawings.

FIG. 2 shows an embodiment of the present invention. In FIG. 2, the same parts as those in FIG. 12 (conventional example) are denoted by the same reference numerals and will be described below.

The difference between the present embodiment shown in FIG. 1 and the conventional example shown in FIG. 12 is a converter. The conversion unit 15 in the present embodiment includes an input unit 16 for inputting the pattern area ratio measurement data, the input pattern area ratio data, and the optimum blade opening obtained by printing each pattern for each printing plate. A print data memory 17 for storing for each area ratio measurement divided area, a conversion function creation calculating unit 18 for reading data from the print data memory 17 and creating a conversion function for converting picture area ratio data into blade opening data; , The created conversion function for each blade B ₁
A conversion function memory 19 for storing corresponding to each B _n; and a conversion function memory 19 based on the input pattern area ratio measurement data.
Includes a conversion calculation unit 20 for calculating output optimal pot opening reads the corresponding conversion function for each blade B ₁ ~B _n, and an output unit 21 for outputting the optimal pot opening in the ink amount control unit 8 from It is composed.

Next, the operation will be described with reference to the flowchart shown in FIG.

Image area ratio measurement data input (step 100) The measurement data of the image area ratio is input to the input unit 16. The picture area ratio measurement data is stored and input to the magnetic card 22 as shown in FIG. 4, for example. Therefore,
In this case, the input unit 16 is constituted by a card reader. The contents of the measurement data of the image area ratios, as shown in FIG. 4, each of the divided areas A _r1 of Suriban 5 for each printing material _{(a), A r2 ... A} rn
(See FIG. 11).
The measurement data of the picture area ratio given in this way is given to the conversion operation unit 20 and the print data memory 17 and subjected to the conversion operation.

Transform operation (step 101) transform operation is a step of calculating a blade opening of each blade B ₁ .about.B _n corresponding to the input image area ratio measurement data.

That is, as shown in FIG. 5, the print data memory 17 stores the pattern area ratio of each divided area of the printing plate 5 obtained at the beginning of setting of the printing press and the blade area corresponding to each of the divided areas. blade opening data items a to n, the printing unit U _Y ~U _B, is stored for each blade B ₁ ~B _n (hereinafter, referred to as the preset data.). The preset data is sequentially read out by the conversion function creation operation unit 18. Transform function generating arithmetic unit 18, based on the print data memory 17 to read out preset data, the printing units U _Y ~U _B, the conversion function D _B1 to D _Bn of each blade B ₁ .about.B _n
Create As shown in FIG. 6, each of the created conversion functions D _{B1 to} D _Bn is assigned to each blade B ₁ to each printing unit U _{Y to} U _B.
BB _n are stored in the conversion function memory 19. When the conversion calculation unit 20 is the image area ratio measurement data is inputted, it reads out the transformation function D _B1 to D _Bn corresponding from the conversion function memory 19, and calculates the matching blade opening with the inputted image area ratio measurement data . The calculated blade opening is output to the output unit 21.
Is output to the ink amount controller 8.

Or if the change over time in the blade B ₁ .about.B _n of ink fountain 3 does not occur, an operation in the case of calculating the blade opening with the printer setting initial preset data. However, changes or the characteristics of the blade B ₁ .about.B _n by repeated printing, as the ink fountain roller 2 (Fig. 10) is the previously mentioned it is intended that varies from the initial state by abrasion It is.

Therefore, in the conversion unit 15 in this embodiment, the blade opening degree (actual data) optimized in the past printing is fed back from the ink control unit 8 (step 10).
2) The print data is updated and stored in the print data memory 17 (see FIGS. 2 and 3). The determination as to whether or not the actual data of the blade opening degree is optimal is made by inspecting the printed material. That is, in the process of performing printing several times, the actual data of the optimal blade opening degree is sequentially stored in the print data memory 17.
Is stored as shown in the table of FIG. The data contents are sequentially updated to new ones. The number of actual data to be stored is the number of past data (for example, 10 times), and a conversion function creation operation unit 18 described later is used by using the data.
To be used for the calculation.

The conversion function creating operation unit 18 reads out some of the optimum blade opening degree actual data stored in the print data memory 17 and uses the least square method as shown in FIG. 7 or the method shown in FIG. A new conversion function is created using, for example, a method of obtaining the average value of the blade opening for each pattern area ratio.

The created new conversion function is sent to the conversion function memory 19 and is replaced with the corresponding old conversion function. Then, it is used in the conversion operation unit 20 at the time of the next printing, and the output unit 21 always outputs the optimum blade opening.

In this way, the preset data initially set by the self-learning operation is sequentially updated with new data every time the number of printings is repeated, and the blade opening degree that is constantly adapted to the aging of the blade is calculated. . Note that the update period of the conversion function may not necessarily each print may be set period with the correlation to changes over time, such as blade B ₁ ~B _n.

Blade opening adjusting device (step 103) The optimum blade opening obtained by the conversion unit 15 is provided to the ink amount control unit 8. The ink amount controller 8 controls each of the printing units U _Y , U _M ,
U _C, for each of the respective inking unit _{1 Y, 1 M, 1 C} , 1 B of the U _B, giving the blade opening adjustment command. Independently operating the respective blade B ₁ .about.B _n individually in each inking unit _{1 Y, 1 M, 1 C} , 1 B by the blade opening adjustment instruction to adjust to the optimal blade opening degree.

Blade Opening Correction (Step 104) Trial printing is performed with the adjusted blade opening. If the result of the inspection indicates that the blade is defective, the operator corrects and adjusts the blade opening of the blade ( _{one of} B1 to _Bn ) of the defective portion using the correction input unit 14. It is to be noted that the finally optimized result data is fed back to the print data memory 17 as described above.

Printing (Step 105) Printing is performed with the blade opening set as described above. When the printing plate 5 is exchanged to print a new item, the above operation is repeated in the same manner. The sequential self-learning effect with this iterative process, the conversion function of the blade B ₁ .about.B _n, conversion unit 7 so as to follow the variation with time of the ink fountain roller 2 is corrected, updated conversion function that gives optimum blade angle Is done. In this way, print quality can be improved. Moreover, the blade opening adjustment is performed based on the optimum conversion function independently of each of the blades B _{1 to} B _n , instead of performing the conversion of the entire bottom plate 4 of the ink fountain 3 by one conversion function. dividing Therefore, it can correct variations between the blades B ₁ .about.B _n mutually enables finer adjustment, further print quality improvement, as well as operator manual by adjustment effort savings test printing time Achieved.

〔The invention's effect〕

As described above, according to the present invention, even if the bottom plate of the ink fountain is divided, deterioration with time occurs between the divided plates, and the degree of opening thereof varies, according to the present invention. Since a conversion function suitable for the pattern area ratio can be set, the degree of opening of each divided plate can be automatically set in a fine and automatic manner. As a result, it is possible to improve the print quality, adjust the opening degree of the pot manually by the operator during test printing, and reduce the time required for the adjustment. It is possible to save labor and time for maintenance such as opening degree adjustment.

[Brief description of the drawings]

FIG. 1 is a diagram corresponding to claims of the present invention, FIG. 2 is a block diagram showing an embodiment of the present invention, FIG. 3 is a flowchart showing the operation of the present invention, and FIG. FIG. 5 is an explanatory diagram showing an example of data stored in a print data memory, FIG. 6 is an explanatory diagram showing an example of data stored in a conversion function memory, and FIG. 7 is created by a least square method. FIG. 8 is an explanatory diagram showing an example of a conversion function created by the average value method, and FIG. 9 is an explanatory diagram showing an outline of a general printing machine having a four-color unit configuration. , FIG. 10 is a perspective view showing an ink fountain, FIG. 11 is an explanatory diagram showing a measurement area of a pattern area ratio of a printing plate, FIG. 12 is a block diagram showing an example of a conventional ink amount setting device, FIG. Is an explanatory diagram showing an example of the contents stored in the conversion function memory, and FIG. FIG. 4 is an explanatory diagram showing an example of a conversion function to. 1 _Y , 1 _C , 1 _M , 1 _B ... Ink unit, 2 ... Ink roller, 3 ... Ink fountain, 4 ... Ink bottom plate, 5 ... Printing plate, 6 ... Pattern area ratio meter, 8 …… Ink amount control unit, 15…
... Conversion unit, U _Y , U _C , _UM , U _B …… Printing unit, B ₁ , B ₂ ,
…, B _n … Blade.

Claims (1)

(57) [Claims] An ink amount setting device for an ink device using an ink fountain in which a bottom plate is divided into a plurality of portions in the width direction of an ink source roller, converts a picture area ratio measurement data of a printing plate into a predetermined conversion function. An ink amount setting device that sets the opening of the ink fountain by converting the data into the opening data of the ink fountain based on the basis of the ink fountain. An ink amount setting device for an inking device.