JPH054329A - Method for adjusting ink quantity preliminary for offset printer - Google Patents

Abstract

PURPOSE:To shorten time to be taken to reach a desired print density by a method wherein a logical necessary ink quantity is added or deducted to and from a work to be performed next time considering remaining quantity of ink on a printer for preliminary adjustment, test printing is performed, thereafter, opening degree of an area diving blade is made to be a desired value of control. CONSTITUTION:A CPU 4 stores in a memory 5 a data indicating a state of ink distribution in the cross direction of a current slider on a group of ink rollers, compares and calculates in accordance with conditions written previously in a ROM of the CPU 4, and stores numeral value thereof in a memory 5a. A numeral value of preliminary adjusting quantity is decided by condition dependent on magnitude of difference quantity written in the ROM in the CPU 4. A calculation value D becomes a numeral value of the preliminary adjusting quantity and is read in a memory 5b of a controller. The data of the memory 5b is outputted to a driving unit 6 of a main controller, a diffusing slider motor is rotated in a set direction and is stopped when a value fed back of a potentiometer 16 coincides with values of the sliders of the memory.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention, when printing a printed matter on an offset printing machine,
The present invention relates to a method of adjusting and controlling an ink supply amount for achieving the ink amount necessary for printing the next different printed matter in a short time.

[0002]

2. Description of the Related Art In multicolor printing in which printing is completed at one time by multicolor printing, a printing method in which the number of colors and each color are fixed to each printing unit are very high in productivity, and therefore printing companies have recently been using them. Is common. After finishing the printing work, the operator looks at the plate or calibration sample of the next print and manually adjusts the ink metering device, or scans the plate surface by optical means and imports the pattern information into the printing machine. Set the amount. The latter is a method known as an ink presetting device, which adjusts the opening of an ink metering device that sets the thickness of the ink film arranged in the ink fountain. Thus, although the adjustment method and the correction control method for obtaining the final target density during the current printing based on the information obtained from the plate or the proof sample related to the print to be printed are known, the current printing is performed. No adjustment was made in consideration of the ink data of the previous printing, and printing was started after the ink preliminary adjustment was set.

[0003]

However, it takes a considerable amount of time from the control of the ink blade opening that determines the amount of ink required for the next printing until the printing density of the printing surface reaches the target quality state. Requires. The main reason is that the ink prepared in the previous printing remains on the printing press. In a multi-color printing machine, generally, a fixed color is used for a printing unit, so that the next printing is often started without completely cleaning the ink-color printer. Therefore, the previous ink remains in the roller group. If there is a large difference in the ink amount with respect to the printing width between the previous printing and the next printing, it will take a long time to reach the desired printing density, and in the meantime a large amount of defective printing and crease will occur, which is uneconomical. Was causing problems. An object of the present invention is to shorten the time required to reach the desired density set as much as possible to reduce the occurrence of defective printing and scraping.

[0004]

[Means for Solving the Problems] The above-mentioned conventional problem is that during adjustment, only the method of correcting or adjusting the ink amount during printing is considered. This is because the state of distribution of the remaining ink amount on the printing machine due to printing is not considered at all. The present invention relates to a printing machine equipped with a printing unit for each color, and an ink metering device for adjusting and controlling the thickness of an ink film of an ink-jet roller provided in the printing unit for each area. The means for storing the numerical value for controlling the ink film thickness at the end of the immediately preceding printing operation by the calculation and storage means, the means for storing the preset numerical value for each area of the next printing operation, or the previously stored numerical value Then, the means for taking out, or the means for inputting the numerical value in the printing plate or the sample to be used for the printing work to be printed, the numerical value for controlling the ink film thickness at the end of the immediately preceding printing work, and the following A method of controlling the ink film thickness by a control unit equipped with a means for comparing the numerical value of the next printing operation or calculating and storing in consideration of conditions, Metering of the ink fountain of the printing machine mechanism and ink furnishing Russia - la - ductor b by changing the distance between the surface of the - La -
In the ink metering method that adjusts the thickness of the ink film of each area, the numerical value for controlling the ink film thickness at the end of the previous printing work and the numerical value for controlling the ink film thickness for each area of the next printing work are compared and calculated. , The value of both is discriminated, and if the latter value is larger than the former value, the latter value is larger, and if the latter value is smaller than the former value, the latter value is set smaller to control the film thickness. After a certain amount of printing operation, the ink fountain adjustment mechanism is controlled by the target input value in the next main printing operation.

Alternatively, an increase / decrease value of the set amount according to the magnitude of the difference set in advance is added to the latter value to set a numerical value for each area to control the film thickness, and after a certain amount of printing operation, the next book is printed. The feature is that the ink fountain metering mechanism is controlled by a target input value in the printing operation. Alternatively, the increase / decrease value of the set amount corresponding to the magnitude of the difference between the two set in advance is added to the latter value, the printing operation is started by setting the numerical value for each area, and the increase / decrease value is sequentially changed according to the print amount. It is characterized in that the metering mechanism of the ink fountain is controlled so as to reach the target input value in the next main printing operation when the printing amount is reduced and reaches a preset printing amount.
In addition, if the value obtained by subtracting the former value from the latter value is positive, this value is added to the next actual printing work numerical value, and conversely, if it is negative, this value is subtracted and the increased or decreased value is used to adjust the ink fountain. Control the amount mechanism and set the print amount, start the printing operation, decrease the absolute value of this increase / decrease value at a certain rate until the set print amount is reached, and memorize it in advance when the set print amount is reached. The feature is that the ink fountain metering mechanism is controlled so as to match the target input value in the next main printing operation.

[0006]

[Function] Taking into account the amount of ink remaining on the printing machine at the end of the work, the theoretically required amount of ink for the next work is increased / decreased and preliminarily metered to perform the test printing operation, and then the area division blade opening amount is controlled. By setting the target value, the time required to reach the desired print density is shortened as a result.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic view showing the outer appearance of an apparatus for carrying out the present invention, FIG. 2 is a block diagram showing an example of the apparatus for carrying out the present invention, and FIG. 3 is a side sectional view of an ink fountain of a printing machine. , Fig. 4
Is a plan view of the ink fountain, FIG. 5 is a diagram showing an example of an operation unit and a display unit of the ink remote metering device applied to FIGS. 3 and 4, and FIG. 6 is an example of a display state of the display unit in the present invention. FIG. The apparatus shown in FIG. 1 is the overall control of the present invention,
The ink remote metering device (1) for adjusting, the plate image area ratio reading device (2), and the printing unit (3) are shown, and the image area ratio reading device (3) is the printing plate (21b) to work next. 2) the pattern data is measured, and the data is directly or indirectly applied to the input section of the ink remote metering device by a medium such as a magnetic card, a magnetic tape, or a floppy disk. Only one printing unit (3) is shown, but in the case of a multicolor machine the same are arranged by the number of colors. Further, the illustration of the paper feed unit and the paper discharge unit required for the printing machine is omitted. The ink fountain unit (12) has a built-in drive device for adjusting the amount of ink. The metered ink passes through the ink source roller (13) and then the ink roller unit (1
0) and is supplied to the pattern portion of the plate (21a) wound around the circumferential surface of the plate cylinder (PS). Edition (21a)
Indicates the one immediately after the end of printing. The design is a rubber cylinder (B
It is transferred to the printing paper on the impression cylinder (IN) via L).

FIG. 2 is a block diagram showing an ink remote device and peripheral devices, which is composed of the following components. Main control unit CPU that controls overall control, calculation and adjustment
(4), storage unit (5) for storing control data, (5
a), (5b), the adjustment amount of the input unit (11), the measurement data or the operation unit (9) that receives the measurement result data of the plate obtained from the pattern area ratio measuring device (2) and transfers it to the CPU Drive unit (6) for moving the slider motor (14) for adjusting the slider corresponding to each ink area placed on the ink fountain (12) of the printing unit, and the adjustment amount is detected. Potentiometer (16), A / D converter (7) that feeds back this amount and transmits it to the CPU section, this adjustment amount and the adjustment result of the previous printing operation for the selected printing unit A display unit (8) for displaying, an operation unit (9) equipped with an operation switch for increasing or decreasing each ink adjusting device of the selected printing unit by a desired amount, and a sensor (16a) for detecting the number of printed sheets of the printing machine. There is.

FIG. 3 is a side sectional view of the ink metering device, in which ink is stored between the ink fountain (12) and the original roller (13) rotated by a motor (not shown). C
The drive amount given by PU (4) is output to the drive unit (6) to rotate the slider-motor (14) in the required direction. (15) is a minute manual adjustment screw. The rotation is transmitted to the metering member (18) through the gear reduction device (17) and converted into forward and backward movement. In the connecting spindle (18a), this movement determines a gap between the ink source roller and each ink area, that is, a slider blade (19).
Be transmitted to. The amount of ink is determined by the size of this gap. Potentiometer (16) to the CPU controller
The detected amount is always fed back by means of the image area ratio measuring device (commonly known as a scanner), and the amount of operation by the operation unit switch or the amount of operation is controlled in accordance with the data stored in the storage units (4) and (5) in advance. It

FIG. 4 shows a part of the plan view of the ink metering device, and the numbers of the respective constituent elements are the same as those in FIG. This slider-blade driving device is provided in an amount of 30 to 40 per unit according to the effective printing width of the printing press. Figure 5 shows a remote ink metering device (commonly known as an ink remote controller).
The display unit and the operation unit of (1) are shown. By pressing the number of the printing unit selection switch (28), the corresponding printing unit can be displayed and operated. (29) is a color board on which a print sample is placed. The slide unit number (30) (see FIG. 7) is written according to the original size of the paper size, and the corresponding display unit and each switch are arranged vertically. (31) is a switch for selecting whether to use the control method of the present invention. If there is not much difference between the patterns before and after the printing work, you can turn it off and adjust it in the conventional way. (32) is a number input switch for manually inputting the print setting number when this control method is used.
Is to start the ink metering device. The amount of movement of the ink slider, in other words, the gap between the original roller and the slider blade can be seen as the lighting (27) of the LED in the form of a bar graph. The number of lights increases or decreases in order from the bottom according to the size of the gap, and no light is emitted at zero gap and all light emitting diodes are turned on at maximum gap. This quantity can also be read with the two digit LED number of (25). This value is given from the storage unit (5a) in FIG.
The maximum gap is displayed as "99" corresponding to 100%, and the zero gap is displayed as "00". The number (26) in the same display shows the state of the ink fountain of the immediately preceding work. This value is given from the storage unit (5) in FIG.

Reference numerals (22), (23) and (24) are manual operation buttons and are composed of an up button (23) for increasing the clearance, a down button (24) for decreasing the clearance, and a lock button (22) for enabling manual operation. Has been done. FIG. 6 shows a display by the conventional metering method (preset) up to a to j among a large number of divided slider blades. (25a) of FIG. 6 (a) is the data of the plate (21a) of the previous work.
(27a) is an LED bar display. Figure 6 (b)
(25b) is the data of the plate (21b) for the next work, (2b).
7b) is an LED bar display, and the data is stored in the storage unit. However, the data shown in FIG. 6 is erased when the next work is started. As described above, in the conventional ink preset control method, the amount of ink on the roller group of the immediately preceding printing unit is not taken into consideration at all, and the data of the next printing plate is directly input to perform the metering control (preset). Was there.

FIG. 7 schematically shows an operation mode according to one embodiment of the present invention. aj
Up to. The data of the plate (21a) of the previous work is stored in the storage unit (5) of FIG. 7, and the data of the plate (21b) of the next work is stored.
The data is stored in the storage unit (5a), and the data before and after the printing work is stored.
The difference between the data is calculated according to a certain condition, and the increased or decreased numerical value and the value of the preliminary adjustment amount are stored in the storage unit (5b). The data before and after printing is displayed on the display section (8) (25).
The data to be printed is displayed as a 2-digit LED value, and the data of the previous printing is displayed in (26). (27) shows the calculated numerical value of the preliminary adjustment as an LED bar display. The data calculation in this embodiment is C in the control unit of the ink remote metering device.
It is performed by PU (4). Table 1 shows the calculated values. (D) and (E) in this table are due to different conditions in the calculation, (D) is the preliminary adjustment value with the difference value as it is, and (E) is half the difference value with the preliminary adjustment value. It is a value. In the case of the embodiment shown in FIG.
(D) is adopted. When the value of (D) exceeds 100, it is set to 100, and when it is a negative value, it is set to 0. These examples are embodiments of the invention described in claim 1. FIG. 8 shows the difference value obtained by the calculation, which is increased or decreased to the value of the next printing operation under conditions different from those of the embodiment of FIG. 7. The numerical value of the preliminary adjustment amount when (E) of Table 1 is adopted. Is displayed. Corresponding numbers (25), (2
6) and (27) are the same as in FIG. 7.

The present invention will be described in detail below. The printed plate (21a) on the printing machine of FIG. 1 is removed and the next work plate (21b) is mounted on the plate cylinder. The pattern data of the plate (21b) is usually controlled by the data measured in advance by the scanner (2) and stored in the storage unit (5) of the ink remote metering device (1). In order to simplify the understanding of the present invention, the number of original split slider blades is 1
The description will proceed with 10 units. In this embodiment, the maximum opening (skimmer) is 100 and the minimum clearance is zero (0). FIG. 7 shows a control unit (1) according to an embodiment of the present invention.
2 shows the state of the internal calculation and the operating state of the display unit (8). The operator can print the printed version (2
1a) is removed, and the plate (21b) for the next work is attached to the printing machine. The pattern data of the plate (21b) is read by the scanner (20) and stored in the storage unit (5) of FIG. 2 prior to the work. Workers are (21a) and (21b)
It is possible to select whether to use the control of the present invention by observing the pattern of FIG. When this switch is pressed, the CPU (4) of the main control unit stores the present numerical value of the slider, in other words, the data indicating the state of the ink distribution in the width direction on the ink-color group, in the storage unit (5). ). The values are stored in the storage unit (5a) by comparison and calculation based on the conditions written in the ROM of the CPU in advance.

Table 1 shows the numerical values of the slider numbers a to j. (A) is the value of the immediately preceding printing work, and (B) is the value of the next work. The calculation unit of the CPU calculates the difference value B-A of the values before and after this, and the magnitude relationship is compared. Here, when the next value is larger than the previous value, that is, when B> A, a certain amount is added to the value of B, and conversely, when B <A, a certain amount is subtracted. (D) is an embodiment in which the difference value is increased or decreased as it is. More specifically, the slider (a) has a previous value of 5 and the next version has a value of 40, which is +3.
Since it is 5, this value 35 is added to the value of B to become 75. Next, when the difference +50 of the slider (b) is added to the value of B, it becomes 110 and exceeds 100. The maximum opening of the slider is 100, so values above 100 are CPU
Judges and sets 100. On the contrary, the difference before and after the slider (c) is -30, and if this value is subtracted from B, it becomes -20, but since there is no zero (0) gap or less, a negative value is set to zero. The preliminary adjustment value (D) in Table 1 shows the calculation under the condition 1/1 in which the difference is increased / decreased as it is, and the numerical value in () is shown as a reference for the direct calculation result exceeding the maximum and the minimum. This increase / decrease amount is determined by the condition depending on the magnitude of the difference amount written in the ROM inside the CPU. Then, the calculated value (D) becomes a numerical value of the preliminary adjustment amount and is read into the storage section (5b) of the control section. At this time, display unit (8)
The state is as shown in the upper part of FIG. (25) shows the value of the next actual printing work to be performed, and (26) shows the value of the immediately preceding printing work. The LED bar graph display of (27) shows the numerical value (D) of the preliminary adjustment. In this way, the preliminary adjustment values of all sliders and all printing units are calculated, and the presetting of each slider is started by the push button (33) in FIG. The data of the storage unit (5b) is output to the drive unit (6) of the main control unit to rotate each slider motor in the set direction, and the fed-back value of the potentiometer (16) matches the value of each slider of the storage unit. At this time, the motor is stopped and the setting for the preliminary adjustment of the ink fountain slider is completed.

Next, the operator sets the number of sheets to be printed by preliminary measurement. According to this control according to the present invention, the preliminary adjustment number is 60 to 90 depending on the pattern difference. Based on the conventional method, the number of sheets until the target ink density is reached by measuring the ink directly with the next plate pattern data is about 3
It is around 00. The number of pre-measured sheets is input by the number switch of (32), the printing machine is started, paper is fed from the paper feeding section, and printing is started. The number of times the printing cylinder is inserted
It is detected by (16a) and given to the control unit. When the CPU determines that this number matches the set number of sheets in (32), the value of the next main printing operation which is the final control target value (B)
The value of is fetched from the storage unit (5a) and output to the drive unit (6). Similar to the above description, each slider motor rotates in the direction required by the difference between the final control target value and the preliminary adjustment value, and stops at the final control target value. The numerical value of (E) in Table 1 is obtained by increasing / decreasing half of the difference value of another condition, that is, (B-A) to the value B of the next work. The control according to this embodiment is shown in FIG. 8 as a display on the operation unit (8). As described above, the amount of increase / decrease can be adjusted according to the magnitude of the difference in addition to the uniform increase / decrease.
Different control can be performed by using a device in which the conditions corresponding to claims 2 to 4 are written. Further, instead of calculating and preliminarily adjusting each of a large number of divided sliders, the sliders can be grouped into groups according to the density distribution of the pattern and controlled by the magnitude relationship of the total values of arbitrary groups. ,
The optimum condition is derived from the data before and after each slider value written in the CPU, and the preliminary adjustment control is performed to realize an efficient and highly productive printing operation.

The present invention is effective even when there is no picture area ratio measuring device. That is, instead of measuring the pattern area ratio for each area of the printing plate to be printed next with a pattern area ratio measuring machine, the operator of the printing machine visually looks at the printing plate, printing sample, etc. It is also possible to judge whether to set the ink film thickness (ink supply amount) and manually input the numerical value based on the judgment. After manual input, various operations are automatically performed by the above method.

[Table 1]

[0017]

By performing the preliminary adjustment control according to the present invention, the time required to reach the final control target density value is shortened as compared with the conventional method, so that the preparation time is shortened and the waste paper is lost. It is a very efficient and effective control method that can obtain the decrease of the output and the increase of the productivity.

[Brief description of drawings]

FIG. 1 is a diagram schematically showing the external appearance of an apparatus for carrying out the present invention.

FIG. 2 is a block diagram showing an example of an apparatus for implementing the present invention.

FIG. 3 is a side sectional view of an ink fountain of a printing machine.

FIG. 4 is a plan view of an ink fountain.

5 is a diagram showing an example of an operation unit and a display unit of the ink remote metering device applied to FIGS. 3 and 4. FIG.

6 (a) and 6 (b) are diagrams showing an example of the operating state of the display unit in the conventional method.

FIG. 7 is a diagram showing an example of an operating state of a display unit according to the present invention.

FIG. 8 is a diagram showing an example of an operating state of a display unit according to the present invention.

[Explanation of symbols]

1 Ink remote metering device 2 Picture area ratio measuring device 3 printing units 4 CPU 5, 5a, 5b storage unit 8 Display 9 Operation part 19 Ink fountain metering mechanism (slider blade) 25 Data to be printed next 26 Preprint data 27 Preliminary metering data

Claims (6)

[Claims] 1. The thickness of the ink film of the ink-jet roller is adjusted by changing the distance between the ink fountain metering mechanism of the offset printing machine and the surface of the ink-jet roller. In the ink metering method, the numerical value that controls the ink film thickness at the end of the previous printing operation and the numerical value for controlling the ink film thickness for each area of the next printing operation are compared and calculated, and the two values are judged to be larger or smaller. When the latter value is large, the latter value is larger, and when the latter value is smaller than the former, the latter value is smaller.The numerical value for each area is set to control the film thickness and after a certain amount of printing operation, the next book An ink pre-measurement method for an offset printing press, which comprises controlling an ink fountain adjustment mechanism with a target input value in a printing operation. 2. The thickness of the ink film of the ink-jet roller is adjusted in each area by changing the distance between the ink fountain metering mechanism of the offset printing press and the surface of the ink-jet roller. In the ink metering method, the numerical value that controls the ink film thickness at the end of the previous printing operation and the numerical value for controlling the ink film thickness for each area of the next printing operation are compared and calculated, and the two values are judged to be larger or smaller. When the latter value is large, the latter value is larger, when the latter value is smaller than the former value, it is smaller than the latter value, and the increment / decrement value of the set amount according to the magnitude of the preset difference is added to the latter value. Ink of an offset printing press characterized by controlling the film thickness by setting a numerical value for each area and controlling the ink fountain metering mechanism with a target input value in the next main printing operation after a certain amount of printing operation. Pre-weighing method. 3. The thickness of the ink film of the ink-jet roller is adjusted for each area by changing the distance between the ink fountain metering mechanism of the offset printing machine and the surface of the ink-jet roller. In the ink metering method, the numerical value that controls the ink film thickness at the end of the previous printing operation and the numerical value for controlling the ink film thickness for each area of the next printing operation are compared and calculated, and the two values are judged to be larger or smaller. When the latter value is large, the latter value is larger, when the latter value is smaller than the former, the latter value is smaller, and the increase / decrease value of the set amount according to the magnitude of the preset difference is set to the latter value. Start the printing operation by setting the numerical value for each added area, and sequentially decrease the added increase / decrease value according to the print amount to reach the preset print amount. Control the ink fountain metering mechanism to reach An ink pre-measuring method for an offset printing machine, which comprises: 4. The thickness of the ink film of the ink-jet roller is adjusted region by region by changing the distance between the ink fountain metering mechanism of the offset printing press and the surface of the ink-jet roller. In the ink metering method, the numerical value for controlling the ink film thickness at the end of the previous printing operation is compared with the numerical value for controlling the ink film thickness for each area of the next main printing operation, and the numerical value for the next main printing operation If the value obtained by subtracting the value at the end of printing work is positive, add this value to the next actual printing work value, and if it is negative, subtract this value and control the ink fountain adjustment mechanism with this increased or decreased value. Then, after setting the print amount and starting the printing operation, the absolute value of this increase / decrease value is reduced at a certain rate until the set print amount is reached, and when the set print amount is reached, the next main print stored in advance. Ink fountain so that it matches the target input value in the work An ink pre-measuring method for an offset printing machine, characterized by controlling a metering mechanism of the ink. 5. The ink-film thickness control numerical value for each area of the next printing operation is based on information obtained by a pattern area ratio measuring device.
An ink preliminary metering method for an offset printing machine according to claim 3 or 4. 6. The numerical value for controlling the ink film thickness for each zone of the next printing operation is based on information obtained by visually observing a printing plate, a printing sample, a film original, or the like. The ink pre-measuring method for an offset printing machine according to claim 2, claim 3, or claim 4.