JPH09300590A - Device for ink supply quantity control - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the instability of adjustment and thereby improve the adjustment accuracy bay providing a mechanism which corrects an ink supply quantity for a specified zone or all of the zones by a manual operation after interrupting the printing operation under control and sets the ink supply quantity as a new target value. SOLUTION: An ink supply quantity control device 2 performs an arithmetic operation of a target control value obtained from an input device 5 for a routine target control value and the density of printed matter 6 obtained from an ink density measuring device 1, and converts the obtained results to an ink quantity adjustment value to control the ink supply quantity. If the color tone of the target value does not coincide with a desired color tone, the desired color ton zone is assigned by the input device 5 for a routine target control value to input the desired target value. Then, even when the printing operation is set under control, it is interrupted for the zone, while the other zone is maintained under an automatic control. Consequently, only in the zone requiring the correction of the ink supply quantity, the automatic control of the zone is turned OFF for a specified time, and the corrected value is set as the target value through the manual operation to control the ink supply quantity. For the zone matching the specified color tone, only the corrected target value of the zone is renewed to resume the automatic control.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink supply amount control device for a printing machine.

[0002]

2. Description of the Related Art A conventional technique will be described with reference to FIGS. FIG. 3 is a diagram showing a relationship between an ink supply amount control zone and a color bar in a printed matter, and FIG. 4 is a flowchart showing a control algorithm of a conventional ink supply amount control device.

A conventional ink supply amount control device measures the color in a color bar of a printed matter having a pattern as shown in FIG. 3 by a spectroscopic means for each zone, and calculates the difference between the target value and the color. Calculate the amount of ink supply correction and use the amount of correction to automatically bring the ink supply for each color (yellow, magenta, cyan, black, etc.) for each zone closer to the target value. It was something to control.

When a slight color correction is to be made for each zone, all controls are once stopped and the ink supply amount is adjusted for each zone, or the ink supply for each zone is adjusted. The target value for the amount was manually entered and set. FIG. 4 shows the flow of work by control and manual operation at that time.

[0005]

In the conventional ink supply amount control device, the color of the color bar is brought close to the target value, but the physical properties of the color separation of the film by the scanner,
Even if the color of the color bar matches the target value due to the degree of development of the printing plate, the color of the design does not always match the color of the proof print (target color sample).

Further, it is often necessary to adjust the color tone based on the customer's sensitivity. In such a case, in the conventional device, once the control mechanism is turned off, the operator adjusts the ink supply amount, and when the color of the entire pattern matches, the measured value of the color bar at that time is set to the target value. After inputting and setting, it was necessary to turn on the control mechanism again.

However, in the conventional apparatus, the color cannot be corrected unless the control is cut off, and after the control is cut off, it is necessary to adjust and reset the ink supply amount for all the zones. Since it is not possible to correct only the zone of No., even a little correction took a lot of time and effort.

There is also a problem that if the user forgets to update the target value data, the data automatically returns to the old target value data. It is an object of the present invention to provide an ink supply amount control device that can solve these problems.

[0009]

[Means for Solving the Problems]

(First Means) The ink supply amount control device according to the present invention is
(A) Control target value input device, (B) Ink density measuring device, and (C) Ink supply amount adjusting device that calculates the difference between the target value and the measured value and converts the difference into an ink amount adjusting value for control. Then, (D) manually correct the ink supply amount,
(E) The control target value input device is an interrupt target value input device 15 for correcting the target value with the correction value.
It is characterized by having. (Second Means) The ink supply amount control device according to the present invention is
(A) Control target value input device 5, (B) Ink density measuring device 1, (C) Ink supply amount adjustment that calculates the difference between the target value and the measured value and converts it into an ink amount adjustment value for control Device 2
And (D) manually correcting the ink supply amount, and (E) the control target value input device includes an algorithm target value input device 25 for correcting the target value with the correction value. Is characterized by.

That is, the apparatus of the present invention is an ink supply amount control device for controlling a target ink density input device, an ink density measuring device, a difference between a target value and a measured value, and converting the difference into an ink amount adjustment value for control. In, in interrupting control,
A mechanism is provided which can manually correct the ink supply amount for a specific zone or all zones and add or update the ink supply amount set value as a new target value.

The uncorrected zone is controlled in parallel with the conventional target value. When an interrupt is made and a manual key operation is performed, the zone of that key is cut off from the automatic control, and after the manual key operation, the effect appears on the printing paper surface, after rotation, the measured value in that state is replaced with the target value and the automatic control is restored.

Therefore, it operates as follows. The operation will be described based on the flowchart of FIG. (S1) A target value is input to the control target value input device 5 from a value obtained by measuring a good print sample in advance with the ink density measuring device 1 or a target value calculated from data of a separately provided plate or film. input. (S2) The ink density measuring device 1 measures the ink density of each zone of the printed matter 6. (S3) Input a target value automatically or manually. (S4) Various control target values are automatically input. (S5) The target value of each zone is manually input. (S6) The control target value and the density of the printed matter being printed by the ink density measuring device 1 are calculated and converted into an ink amount adjustment value, and the ink supply amount is controlled by the control device.

Usually, the ink supply amount is controlled according to the above-mentioned target value, as in the conventional ink supply amount control device. (S7) When the shade in the target value does not match the desired shade, the zone is designated by the target value input device, and the required target value is input, so that the interrupt to that zone is achieved even during control. It takes, and it progresses to (S9).

While the automatic control of the other zones is maintained, the amount of ink supplied to the zones can be adjusted manually. In the zone where no correction is made, the original target value is used for control as it is.

If there is no interrupt, the process proceeds to (S8). (S8) In the corrected zone, the ink supply amount is controlled based on the corrected value.

Then, the process returns to (S7). (S9) When the ink adjustment is interrupted, the amount of ink in the required zone is corrected. (S10) A target value corresponding to the correction amount of the corrected zone is set. Automatic control is canceled only for that zone. (S11) For the zone corrected by the adjustment, after that, the automatic control of the zone is turned off for a predetermined time,
After a predetermined time, the ink density measurement value of the zone of the printed matter is held as a new target value and used as the target value of the ink supply amount, and the ink supply amount is controlled accordingly.

The predetermined time for stopping the above-mentioned automatic control is a time for correcting the time delay in which the ink amount adjustment result does not appear on the printed matter. The time during which the ink amount adjustment result does not appear on the printed matter is 10 to 10 times the normal rotation speed of the printing cylinder.
It is the time corresponding to 50 rotations. (S12) For the correction of the zone that does not match the predetermined hue, the above-mentioned (S9) to (S11) are repeated. (S13) For the zone that matches the predetermined color, only the corrected target value of the zone is updated, and the automatic control is restarted. Then, the process proceeds to (S8).

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION

(First Embodiment) FIG. 1 shows a first embodiment of the present invention.
~ It demonstrates based on FIG. 1 is a configuration diagram of an ink supply amount control device according to a first embodiment of the present invention, FIG.
FIG. 3 is a flowchart illustrating the operation of the ink supply amount control device according to the first embodiment of the present invention, and FIG. 3 is a diagram showing a relationship between an ink supply amount control zone and a color bar in a printed matter.

The ink supply amount control device according to the first embodiment of the present invention comprises (A) an ink density measuring device 1;
(B) An ink supply amount adjusting device 2 is provided. The ink density measuring device 1 of (A) has the process printing colors (yellow, magenta,
(Cyan, black), and / or a densitometer for measuring the density of each color in a color bar chart printed in solid colors, and / or obtained by overlay printing of yellow, magenta, cyan points, etc. It consists of a spectrometer that analyzes the gray balance of the gray chart in the color bar using a spectrum. (B)
The ink supply amount adjusting device 2 is connected to the ink density measuring device 1 and is also connected to the control target value input device 5, and calculates the difference between the target value and the measured value to adjust the ink supply amount. And is connected to the printing machine 200 for controlling.

Then, the ink supply amount adjusting device 2 can manually correct the ink supply amount in the required zone from the control target value input device 5 even during the control by using the interruption. A function that can set a modified value as a new target value,
It also has a function of holding a value related to the correction amount between the measured value and the correction value as a deviation parameter, and thereby correcting the target value of the ink supply amount by the measurement during operation.

[0021]

Since the present invention is constructed as described above, it has the following effects. (1) According to the present invention, the ink supply amount adjusting device 2 is provided with an interrupt for inputting a target value, so that the ink supply amount in an arbitrary zone can be adjusted even during control. (2) Since the ink supply amount is controlled by the interruption of the target value input, it is not necessary to turn off the automatic control each time the ink supply amount is adjusted. (3) Therefore, it is possible to save a great amount of time, and (4) since adjustment can be performed in a stable state during operation, instability of adjustment can be eliminated and adjustment accuracy can be improved.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an ink supply amount control device according to a first embodiment of the present invention.

FIG. 2 is a flowchart illustrating an operation of the ink supply amount control device according to the first embodiment of the present invention.

FIG. 3 is a diagram showing a relationship between a control zone of an ink supply amount and a color bar in a printed matter.

FIG. 4 is a flowchart showing a control algorithm of a conventional ink supply amount control device.

[Explanation of symbols]

 1 ... Ink density measuring device 2 ... Ink supply amount adjusting device 3 ... Ink amount adjusting mechanism 4 ... Ink amount adjusting value detector 5 ... Control target value input device (target ink density input device) (including target value input device by interruption) 15) (Including target value input device 25 by algorithm) 6 ... Printed material 15 ... Target value input device by interrupt 25 ... Target value input device by algorithm 100 ... Ink supply amount control device 200 ... Printing machine

Claims (2)

[Claims] 1. A control target value input device (5),
(B) An ink density measuring device (1) and (C) an ink supply amount adjusting device (2) for calculating a difference between a target value and a measured value, converting the difference into an ink amount adjusting value, and controlling the ink amount. ) Manual correction of the ink supply amount is added, and (E) the control target value input device (5) is provided with an interrupt target value input device (15) for correcting the target value with the correction value. Characteristic ink supply amount control device. 2. A control target value input device (5),
(B) An ink density measuring device (1) and (C) an ink supply amount adjusting device (2) for calculating a difference between a target value and a measured value, converting the difference into an ink amount adjusting value, and controlling the ink amount. ) In addition to the manual correction of the ink supply amount, (E) the control target value input device (5) comprises an algorithm target value input device (25) for correcting the target value by the correction value. Characteristic ink supply control device.