JP2003001797A - Ink supplier for printing press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ink supplier for a printing press which is capable of regulating the amount of ink supplied to an ink roller upon forming an ink film before starting printing more delicately than that in a conventional supplier, and capable of easily forming the ink film of the optimum thickness compared with the same in a conventional supplier. SOLUTION: The ink supplier for a printing press previously forms the ink film, whose thickness is distributed in the axial direction of the printing plate in accordance with a pattern before starting printing. The number of calling times of an ink shifting roller upon forming the ink film before starting the printing is constituted so as to be changeable, and the supplying amount of ink per one calling time of the ink shifting roller upon forming the ink film before starting the printing is smaller than that upon carrying the printing out.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink supply device for a printing machine, and more particularly to a device for forming a predetermined ink film on an ink roller in advance before starting printing.

[0002]

2. Description of the Related Art Generally, a plate cylinder used in a printing machine has
A printing plate is wrapped around the outer peripheral surface, and ink and dampening water are supplied to the printing plate for printing. FIG. 4 schematically shows the ink supply device of the printing machine. Explaining the configuration of the apparatus, the printing machine is an offset sheet-fed printing machine, and includes a plate cylinder 1 around which a printing plate 4 is wound and a blanket cylinder 2
It is printed on a printing sheet such as a sheet of paper passing between the impression cylinder 3 and the blanket cylinder 2 via the (blanket cylinder).

An ink supply device 5 for supplying ink to the plate 4 of the plate cylinder 1 and a water supply device 6 for supplying water to the plate 4 are provided for each plate cylinder 1. 5 schematically shows an enlarged view of a main part, the ink supply device 5 includes an ink fountain 7 including an ink fountain roller 8 and a blade 9,
The ink 10 stored in the ink fountain 7 flows out from the gap G between the ink fountain roller 8 and the blade 9 and is supplied to the outer peripheral surface of the rotating ink fountain roller 8. The gap G can be adjusted by opening and closing the blade 9. When the opening degree of the blade 9 is increased, the gap G is expanded and the amount of ink flowing out of the ink fountain 7 is increased. If the opening degree is made smaller, the gap G becomes narrower and the amount of ink coming out becomes smaller.

The blade 9 is composed of a plurality of ink fountain keys arranged side by side along the axial direction of the ink fountain roller 8 (width direction of the printing paper), and the degree of opening of each ink fountain key is different. It is adjustable. Then, the opening degree of each ink fountain key is set according to the pattern area ratio of the printing plate 4. The pattern area ratio is measured for each zone in which the printing plate is divided into equal parts in the width direction corresponding to the ink fountain keys, and the pattern area ratio data for each zone is converted into ink fountain key opening degree data and the opening The opening degree of each ink fountain key is set based on the degree data, and printing is started. This is called so-called ink preset, and by adjusting the ink supply amount according to the pattern before printing, it is possible to reduce the amount of wasted paper at the beginning of printing and to shorten the time to shift to steady printing operation. It is possible.

On the other hand, the ink flowing from the ink fountain 7 onto the ink fountain roller 8 is supplied to the printing plate 4 through an ink roller group 11 composed of a large number of ink rollers 17. The ink roller 17 is provided in parallel with the ink fountain roller 8 and the plate cylinder 1 and is provided so as to be in contact with each other so that the ink is sequentially transferred from the upstream side to the downstream side. The inking rollers 12, 13, 14, and 15 located on the most downstream side are configured to be able to come into contact with and separate from the plate cylinder 1. Further, between the ink roller 17 and the ink fountain roller 8 which are located at the most upstream side, an ink transfer roller 16 which is swingable between both rollers is positioned. The ink transfer roller 16 has an arrow 9 between both rollers at a constant cycle.
A calling operation is performed to reciprocate in the 1,92 direction, and the ink attached to the outer peripheral surface of the ink fountain roller 8 is transferred to the ink roller 17 by this calling operation. In this way, the ink 10 in the ink fountain 7 moves from the ink fountain roller 8 to the ink transfer roller 16 and the ink roller 17, and the inking rollers 12, 13, 14, and 15 come into contact with the printing plate 4 to cause the printing plate 4 to move. Is supplied to.

By the way, it is necessary to adhere to each ink roller 17 the minimum basic ink film required during printing. The basic ink film 10 is shown in FIG.
It shows the ink roller 17 to which a is attached, and the basic ink film 10a has a uniform thickness along the axial direction of the ink roller 17. Then, an image ink film 10b corresponding to the design of the printing plate 4 is superposed on the basic ink film 10a. The thickness of the image ink film 10b changes along the axial direction of the ink roller 17. For example, when the ink film thickness distribution as shown in FIG. 6B is required, the degree of opening of each ink fountain key is adjusted according to the measured pattern area ratio, so that the ink from the ink fountain 7 according to the pattern is adjusted. Is sent to the ink roller 17 and the image ink film 10b is superposed on the basic ink film 10a having a uniform thickness to form an ink film having a film thickness distribution in the axial direction on the ink roller 17 according to the pattern of the printing plate 4. To do.

The ink adhering to each ink roller 17 is transferred from the upstream ink roller 17 to the downstream ink roller 1.
It gradually becomes thinner toward 7. Therefore, the basic ink film 10
6A is gradually thinned from the upstream side to the downstream side as shown in FIG. 6D, and the image ink film 10b superimposed thereon is gradually thinned as shown in FIGS. 6E and 6F. Incidentally, FIG.
The ink amounts corresponding to the lines L1 and L2 in (c) are shown in FIGS. 6 (e) and 6 (f), respectively.

The greater the opening degree of the blade 9, the greater the number of revolutions of the ink fountain roller 8, and the greater the number of times the ink transfer roller 16 is called, the more the ink fountain 7 is fed to the ink roller 17. The ink supply amount increases and the ink film formed on the ink roller 17 also becomes thicker, so that the density of the printed image also becomes higher.

On the other hand, in recent years, in addition to ink presetting, a predetermined ink film is further formed on each ink roller 17 in advance before starting printing. For example, when the printing operation is started in a state where the ink is not attached to the ink roller 17, first, all the ink fountain keys have the same degree of opening, and the ink transfer roller 16 is called a predetermined number of times to move the ink roller 17 to the ink roller 17. The basic ink film 10a is formed. Thereafter, the opening degree of each ink fountain key is preset based on the pattern area ratio of the printing plate 4 as described above, and the ink transfer roller 16 is called a predetermined number of times to operate the basic ink film 10a of the ink roller 17 on the basic ink film 10a. 10b
After completion of the ink film forming process, the actual printing operation is started with the preset ink fountain key opening degree. In this way, before the start of printing, the ink film thickness distribution in the axial direction according to the pattern of the printing plate 4 is determined by the ink roller 1.
By pre-forming on 7, combined with ink preset, good printing condition can be obtained early after printing starts,
It is possible to further reduce the waste paper generated up to that point.

[0010]

By the way, there are cases where it is desired to finely adjust the number of times of calling when forming the image ink film 10b before the start of printing. For example, when printing conditions such as temperature, humidity, ink characteristics, etc. have changed from the previous printing work, the number of calls set on the printing machine is not used as it is, but the operator changes the number of calls and prints. There is a demand for fine adjustment of the ink supply amount when forming the image ink film 10b before the start. Therefore, there is an ink supply device that is configured so that the operator can arbitrarily change and input the number of times of calling. However, since the number of times of calling to form the image ink film 10b before starting printing is small, for example, a few times or a dozen or more, the ink supply amount per one calling is large, and the number of calling is substantially one unit. Since it is increased / decreased by, the fluctuation range of the ink supply amount when the number of times of calling is changed becomes larger than desired, and it is difficult to finely adjust the ink supply amount.

Therefore, the present invention has been made in view of the above-mentioned conventional problems, and the amount of ink supplied to the ink roller when forming an ink film before the start of printing can be adjusted more finely than before, and a more appropriate film thickness than before. It is an object of the present invention to provide an ink supply device of a printing machine, which can easily form the ink film of (1) before printing.

[0012]

The present invention has been made to solve the above problems, and an ink supply device of a printing machine according to the present invention comprises an ink fountain composed of an ink fountain roller and a blade. It is configured to transfer the ink from the ink fountain roller to the ink roller by the calling operation of the ink transfer roller, and to supply the ink to the printing plate via the ink roller. Before the printing starts, the axial direction is changed according to the pattern of the printing plate. In an ink supply device of a printing machine that forms an ink film whose film thickness is distributed on the ink roller in advance, the number of times the ink transfer roller is called when forming the ink film before printing is configured to be changeable The feature is that the amount of ink supply per call of the ink transfer roller when forming the ink film before is smaller than that during printing. To.

In this case, it is preferable that the number of revolutions of the ink fountain roller at the time of forming the ink film before the start of printing is set smaller than the number of revolutions of the ink fountain roller at the time of printing.

Further, it is preferable that the opening degree of the blade at the time of forming the ink film before the start of printing is set smaller than the opening degree of the blade at the time of printing.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of an ink supply device for a printing machine according to the present invention will be described below with reference to the drawings. FIG. 1 is a hardware configuration diagram of a main part of the ink supply device according to the present embodiment. C on the bus line 24
PU21, ROM22, RAM23 are connected.
The CPU 21 controls each unit according to the program stored in the ROM 22. The machine control unit 25 and the paper feed control unit 26 are connected to the bus line 24 via an I / O interface 36. The machine control unit 25 controls the rotation of each cylinder and each roller of the printing machine, and the paper feed control unit 26 controls the feeder unit to feed paper.

Further, on the bus line 24, an ink fountain key control unit 31, an ink fountain roller control unit 32, an ink transfer roller control unit 33, through an I / O interface 36,
Inking roller control unit 34, floppy (registered trademark)
The disk drive 35 is connected. The inking roller control unit 34 controls contact and non-contact of the inking rollers 12, 13, 14, 15 of the ink roller group 11 with the plate cylinder 1. The ink fountain key control unit 31 controls movement of each ink fountain key of the ink fountain 7 to control the degree of opening. The ink fountain roller control unit 32 controls the rotation speed of the ink fountain roller 8. Ink transfer roller control unit 3
Reference numeral 3 controls stop and drive of the calling operation of the ink transfer roller 16.

Further, on the bus line 24, a paper type selection input section 27, a start pattern input section 28, a machine start input section 29, an inking start input section 30, and a call count input section 37 are provided via an I / O interface 36. And the display unit 38 is connected. The operator selects and inputs the paper type through the paper type selection input unit 27, and selects and inputs the inking content, that is, start inking or preset inking through the start pattern input unit 28.
The CPU 21 recognizes this input and executes control according to the input. When the operator makes an input through the machine start input unit 29, the CPU 21 recognizes this input and controls the machine control unit 25 described above. When the operator makes an input through the inking start input unit 30, the CPU 21 recognizes the input and controls the ink fountain key control unit 31, the ink fountain roller control unit 32, the ink transfer roller control unit 33, and the like to perform the inking. To execute. Furthermore,
The CPU 21 displays the number of calls of the ink transfer roller 16 on the display unit 38, and the operator can confirm the displayed number of calls and input the desired number of calls through the number-of-calls input unit 37. CPU
21 recognizes this input, and controls the ink transfer roller control unit 33 according to the input number of calls.

Next, the contents of the program stored in the ROM 22 will be described with reference to the flowcharts of FIGS. First, the CPU 21 determines whether or not the paper type of the printing paper is selected and input through the paper type selection input unit 27 (step S2). The paper type selection input unit 27 is provided as a button for each paper type on the operation panel, and the operator presses the button corresponding to the paper type of the printing paper used for the current printing. The CPU 21 recognizes through the I / O interface 36 that the operator has pressed the button corresponding to the paper type, and stores the selected paper type in the RAM 23 (step S4).

Next, the CPU 21 fetches image information (step S6). The image information is information about the amount of ink required according to the design of the printing plate 4, and is read from the floppy disk set in the floppy disk drive 24. When the image area ratio data for each zone is stored in the floppy disk as image information, this image area ratio data is converted into the ink fountain key opening degree of the ink fountain 7 in a later step. Incidentally, the pattern area ratio data can be directly fetched from the pattern area ratio meter through the communication interface. Further, when the image area ratio data is converted into the ink fountain key opening degree data by the opening degree converting device and the ink fountain key opening degree data is stored in the floppy disk, the data conversion is not performed in the subsequent step.

After capturing the image information in step S6,
The CPU 21 determines whether or not the start pattern is input through the start pattern input unit 28 (step S8).
There are two types of start patterns, start inking and preset inking, and the operator inputs either pattern through the selection button. The start inking is performed by the ink roller 17 such as when starting work in the morning.
The preset inking is selected when the ink is not adhered to the ink roller 17, and the ink is applied to the ink roller 17 when the printing plate 4 is replaced and a new printing is performed after the previous printing is completed. Is selected when is already attached. When the operator inputs the start pattern to the start pattern input unit 28, the CPU 21 recognizes the input start pattern through the I / O interface 36,
It is stored in the RAM 23 (step S10).

When the operator operates the machine start input section 29 to instruct to start the machine, the CPU 21 gives a signal to the machine control section 25 to start the machine (steps S12 and S14), and the operator performs inking. When the start input unit 30 is operated to instruct the inking start, the start pattern stored in step S10 is determined (steps 16 and 18).

When the start pattern is start inking, the CPU 21 gives a signal to the ink fountain key controller 31 through the I / O interface 36 to open all the ink fountain keys in parallel according to a preset initial opening degree. Along with (step S20), a signal is given to the ink fountain roller controller 32 to rotate the ink fountain roller 8 in accordance with a preset reference rotational speed (step S2).
2). The initial opening degree is, for example, 10%,
For example, 40% is set as the reference rotation speed.
The degree of opening is expressed as a percentage with the maximum open state of the ink fountain key set as 100%.
The number of rotations of is represented by a percentage with 100% of the rotation at the maximum speed.

Subsequently, the CPU 21 gives a signal to the ink transfer roller control unit 33 through the I / O interface 36 to operate the ink transfer roller 16 to perform a preset number of calling operations, for example, 80 calling operations. (Step S24, step S26). The above steps S20 to S26 are the basic ink film forming step, whereby the basic ink film 10a is formed on each ink roller 17.

When preset inking is selected as the start pattern in step S10, the ink roller 17 is idled until it reaches a preset idling number, for example, 50 times (step S28), and each ink roller. The amount of ink between 17 is made uniform.

Next, the CPU 21 determines that the image information stored in the above step S6 is "picture area ratio data".
Is determined (step S30), and if the pattern area ratio data is stored, the process proceeds to step S32 to convert the pattern area ratio data into ink fountain key opening degree data of each ink fountain key, A signal is given to the ink fountain key control unit 31 to control each ink fountain key according to the ink fountain key opening degree data.

Then, in step S34, the reference rotation speed (40%) of the ink fountain roller 8 is multiplied by the paper coefficient corresponding to the paper type stored in step S4 to obtain the adjusted rotation speed. The sheet coefficient of each sheet type is stored in the ROM 22 as a table, and the sheet coefficients of coated paper, matte coated paper, and non-coated paper are "1" and
It is "1.1" and "1.2". For example, when uncoated paper is stored in step S4, the reference rotation speed is 40
% Is multiplied by “1.2” to obtain the adjusted rotation speed of 48%. Similarly, the reference low speed rotation speed of the ink fountain roller 8 is multiplied by the sheet coefficient to obtain the adjusted low speed rotation speed. The reference low speed rotation speed is also set in advance similarly to the reference rotation speed, and for example, 20% of 1/2 of the reference rotation speed 40% is set. Therefore, the reference low speed rotation speed of 20% is multiplied by the paper coefficient "1.2" of the uncoated paper to obtain the adjusted low speed rotation speed of 24%. That is, this adjusted low speed rotation speed is also 1/2 of the adjusted rotation speed.
Then, the CPU 21 sends a signal to the ink fountain roller control unit 32 to rotate the ink fountain roller 8 at the adjusted low speed rotation speed, and stores the obtained adjusted rotation speed in the RAM 23 (step S36).

On the other hand, when the ink fountain key opening degree data is stored as the image information in step S6, the process proceeds from step S30 to step S38, and the CPU 21 gives a signal to the ink fountain key control section 31 to cause the ink fountain key opening degree to open. Control and open each ink fountain key according to the data. Then, the process proceeds to step S40 and the ink fountain roller 8 is rotated at the standard low speed rotation speed (20%).

Next, in step S42, the reference number of times the ink transfer roller 16 is called (20 times in this embodiment).
On the other hand, the number of adjustment calls is obtained by multiplying the paper coefficient corresponding to the paper type stored in step S4. The reference number of calls is stored in the RAM 23. For example, when the paper type is uncoated paper, the standard call count is 2
The number of adjustment calls 24 times is obtained by multiplying 0 times by the paper coefficient “1.2” of uncoated paper.

Then, in step S44, the calculated number of adjustment calls is displayed on the display unit 38, and the operator checks the displayed number of adjustment calls. On the operation panel, an OK button and a number input button are provided as the number-of-calls input section 37. When the operator wants to change the displayed number of calls, he or she presses the OK button to change the number of calls. Change to the desired number using the number input button. When the operator inputs the desired number of calls including the case of pressing the OK button through the number-of-calls input unit 37, the CPU 21 recognizes it and stores the confirmed or changed adjusted number of calls in the RAM 23.
A signal is sent to the ink transfer roller control unit 33 to operate the ink transfer roller 16 (step S46), and the RAM 23
The ink transfer roller 16 is called for the number of adjustment calls stored in step S6, and the ink is transferred from the ink fountain roller 8 to the ink roller 17 to form the image ink film 10b on the ink roller 17 (step S48).

When the image ink film forming step is completed,
When the image information determined in step S30 is the pattern area ratio, the process proceeds from step S50 to step S52, and the CP
U21 sends a signal again to the ink fountain roller control unit 32 to rotate the ink fountain roller 8 at the adjusted rotation speed stored in the RAM 23. When the image information determined in step S30 is the degree of opening of the ink fountain key, the process proceeds from step S50 to step S54, and the ink fountain roller 8 is rotated at the reference rotation speed.

After that, the CPU 21 gives a signal to the inking roller control section 34 and the sheet feeding control section 26 to bring the inking rollers 12, 13, 14, and 15 into contact with the plate 4 and feed the sheet from the feeder section. Start (step S5)
6). Subsequently, the number of printed sheets is input, and the input number of printed sheets is stored in the RAM 23 (steps S58 and S6).
0), printing is started. After printing, when printing is performed up to a preset number of sheets set in advance, the CPU 21 gives a signal to the ink transfer roller control unit 33 to stop the operation of the ink transfer roller 16 (steps S62 and S64), and thereafter, the ink is transferred. Printing is continued by the ink attached to the roller 17, and when the number of printed sheets reaches the number stored in step S58, the printing is finished (step S6).
6).

As described above, when the image ink film 10b is formed before the start of printing, the number of revolutions of the ink fountain roller 8 is set to about half the speed at which printing is performed, so that the image ink film is formed. The ink supply amount for one time of calling is about half of that for printing. Conventionally, the number of rotations of the ink fountain roller 8 at the time of forming the image ink film is the same as that at the time of printing, and as a result, the ink supply amount for one invocation can be adjusted before the printing is started. Was big. On the other hand, in the present embodiment, the reference number of calls and the number of adjustment calls are about twice as many as the conventional number of calls, while securing the absolute amount of ink supply necessary for forming the image ink film, The number of rotations of the ink fountain roller 8 is set to half of that at the time of printing, and the ink supply amount for one call is set to about half of that at the time of printing. As a result, when the number of times of calling is changed in increments of one in step S44, the fluctuation range of the ink supply amount per time is about half that of the conventional method, and therefore the ink supply amount is adjusted with about twice the accuracy of the conventional method. be able to. In this way, the ink supply amount can be adjusted with high precision, so that even if the ink characteristics or the like change subtly, the ink supply amount can be finely adjusted in response to it, making it easier to achieve a more appropriate image ink film 10b than before. Can be formed.

In this embodiment, the reference low speed rotation speed is set to 1/2 of the reference rotation speed, but the present invention is not limited to this, and it may be set to 1/3 of the reference rotation speed or other ratio. It is also possible that the speed is lower than the reference rotation speed in any case.

In the above embodiment, the ink fountain roller 8 is rotated at a lower rotational speed than that at the time of printing to reduce the ink supply amount per calling number than that at the time of printing. Instead of changing the rotation speed of the roller 8, the opening degree of the blade 9 may be made smaller than that at the time of printing, and the ink supply amount per calling number may be made smaller than that at the time of printing. In that case, the degree of opening of each ink fountain key is made smaller than that at the time of printing. That is, at the time of forming the image ink film, the degree of opening of the ink fountain key converted from the pattern area ratio is set to, for example, about half the opening degree, and after the image ink film is formed and before the printing is executed, the regular ink fountain that has been converted is used. Adjust to the key open degree and start printing in that state.

Further, either one of the number of revolutions of the ink fountain roller 8 and the opening degree of the blade 9 may be smaller than those at the time of printing, or both may be smaller.

[0036]

As described above, by making the ink supply amount for one call count smaller than that at the time of printing,
The accuracy of adjustment when adjusting the ink supply amount by changing the number of times of calling once is higher than before, and therefore an ink film with a more appropriate film thickness than before can be easily formed before printing starts. .

[Brief description of drawings]

FIG. 1 is a hardware configuration diagram of an ink supply device of a printing machine according to an embodiment of the present invention.

2 is a flowchart of a program stored in a ROM shown in FIG.

FIG. 3 is the same flowchart.

FIG. 4 is a schematic side view of an ink supply device.

FIG. 5 is an enlarged view schematically showing a main part of an ink supply device.

6A and 6C are schematic diagrams showing the amount of ink attached to an ink roller. (B) is a graph showing an example of the required amount of ink according to the image on the printing plate. (D) and (e) and (f) are schematic diagrams showing the ink amount in the ink roller group.

[Explanation of symbols]

1 ... plate cylinder, 2 ... rubber cylinder, 3 ... impression cylinder, 4 ... printing plate, 5 ... ink supply device, 7 ... ink fountain, 8 ... ink fountain roller, 9 ...
Blade, 10 ... Ink, 10a ... Basic ink film, 10
b ... Image ink film (ink film), 11 ... Ink roller group, 12, 13, 14, 15 ... Ink application roller, 16
... Ink transfer roller, 17 ... Ink roller, 32 ... Ink fountain roller control unit, 33 ... Ink transfer roller control unit, 3
7 ... number of calls input section, 38 ... display section

Claims (3)

[Claims] 1. Ink fountain roller (8) and blade (9)
And the ink fountain (7) is composed of the ink fountain roller (8) and the ink transfer roller (16).
The ink is transferred from the ink roller to the ink roller (17) and the ink is supplied to the printing plate (4) through the ink roller (17). In an ink supply device of a printing machine in which an ink film (10b) whose film thickness is distributed in the axial direction is formed in advance on an ink roller (17), an ink transfer roller (when forming the ink film (10b) before starting printing ( 16) the number of calls to the ink transfer roller (16) is variable when the ink film (10b) is formed before printing is started. Ink supply device for printing machines characterized by less than that. 2. The number of rotations of the ink fountain roller (8) when the ink film (10b) is formed before the start of printing is
The ink supply device for a printing press according to claim 1, wherein the number of revolutions of the ink fountain roller (8) at the time of printing is set to be smaller. 3. The opening degree of the blade (9) when forming the ink film (10b) before the start of printing is set to be smaller than the opening degree of the blade (9) when printing is performed. Ink supply device for the printing machine described.