JP2003191441A - Printer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a printer capable of changing a color tone per part, in the printer equipped with an automatic printing density control. <P>SOLUTION: The printer has a manual control mode. In this mode, a proportion display 53, a proportion adjustment key 54, a selection range adjustment key 55 and a region selection key 56 are provided. In addition, in the manual control mode, first a region where an ink key divergence is changed is indicated by the region selection key 56. Next, the ink key divergence in the region is changed by depressing the selection range adjustment key 55. The ink key divergence enables a percentage represented by the proportion display 53 to be increased/decreased by the frequency of depressing the selection range adjustment key 55. A print density proportionate to the ink key divergence set by the manual control mode is measured and the measurements are stored in a storage means as a target print density. Finally, an ink supply is controlled using the target print density in the automatic control mode. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing apparatus having an ink supply means such as an ink fountain device.

[0002]

2. Description of the Related Art A general offset printing apparatus is equipped with an ink fountain device having a plurality of ink keys.
The ink supply amount can be changed for each of a plurality of areas along the width direction of the printing paper. Thereby, the ink supply amount was controlled according to the image area on the printing plate.

Conventionally, in the printing apparatus as described above, the print density and the print color on the printed matter are measured, and the ink supply amount is feedback-controlled by comparing this with a preset target print density and print color. ing. (For example,
See Patent Document 1. )

[Patent Document 1] Japanese Patent No. 2824334

[0004]

If the print density measured as described above is controlled so as to match the target print density by automatic setting, even an inexperienced operator can obtain a proper printed matter.

However, there are cases where it is desired to manually correct the color tone of the printed matter, for example, to finish the printed matter by partially emphasizing the reddishness rather than the standard, based on the sensitivity of the operator or the designer. In this case, there is a problem in that it is not possible to adjust each part by using the automatic setting.

The present invention has an object to achieve the above object, and provides a printing apparatus capable of changing the color tone of each portion while automatically controlling the printing density. In particular, a condition set manually is automatically set. A printing device that can be reflected in

[0007]

According to a first aspect of the present invention, there is provided an ink supply means capable of supplying a desired amount of ink to a plurality of areas in the print width direction, and a target print density for all areas. Target print density setting means for setting, image reading means for obtaining image data of the printed matter in the conveyance path of the printed matter, and measured print density calculating means for processing the imaged data to calculate the measured print density of the printed matter for each area. And an ink supply amount control means for controlling the ink supply amount supplied by the ink supply means so that the measured print density of each area becomes the target print density, and the ink supply quantity is manually changed for each area. The ink supply amount changing means capable of changing the ink supply amount, and the area changed by the ink supply amount changing means is based on the ink supply amount changed by the ink supply amount controlling means. A printing device being characterized in that to perform the control Te.

According to a second aspect of the invention, in the printing apparatus according to the first aspect, the ink supply amount changing means can increase or decrease the set ink supply amount at a predetermined rate. To do.

According to a third aspect of the present invention, in the printing apparatus according to the second aspect, the ink supply amount changing means is a ratio setting means for setting the ratio and the ink supply amount is increased or decreased for each area. An increase / decrease key is provided, and each time the increase / decrease key is pressed, the ink supply amount is increased / decreased at a set rate.

According to a fourth aspect of the present invention, in the printing apparatus according to any one of the first to third aspects, the ink supply amount control means supplies ink according to the ink supply amount changed by the ink supply amount changing means. It is characterized by having a setting key for determining whether to control the means.

According to a fifth aspect of the present invention, in the printing apparatus according to any one of the first to fourth aspects, the target print density can be changed during printing.

According to a sixth aspect of the present invention, in the printing apparatus according to any one of the first to fifth aspects, the ink supply amount changing means changes the target print density for each area to supply the ink. The feature is that the amount is changed.

According to a seventh aspect of the present invention, an ink supply means capable of supplying a desired amount of ink to a plurality of areas in the print width direction and a target print density setting for setting a target print density for all areas. Means, image reading means for obtaining image pickup data of the printed matter in a conveyance route of the printed matter, measurement print density calculating means for processing the image pickup data to calculate a measured print density of the printed matter for each area, and each of the areas. Ink supply amount control means for calculating the ink supply amount for each area so that the measured print density matches the target print density, and controlling the ink supply means based on the calculated ink supply amount; Ink supply amount changing means that can change the amount manually for each area, and the measured print density of the area where the ink supply amount is changed is set as a new target print density. A storage storing means, a printing apparatus having a.

According to an eighth aspect of the present invention, an ink supply means capable of supplying a desired amount of ink to a plurality of areas in the print width direction and a target print density setting for setting a target print density for all areas. Means, image reading means for obtaining image pickup data of the printed matter in a conveyance route of the printed matter, measurement print density calculating means for processing the image pickup data to calculate a measured print density of the printed matter for each area, and each of the areas. Ink supply amount control means for controlling the ink supply means based on the calculated ink supply amount while calculating the ink supply amount for each area so that the measured print density matches the target print density, and for each area The printing apparatus further includes a target print density changing unit that can change the target print density and a storage unit that stores the changed target print density.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [Description of Printing Apparatus] Hereinafter, an embodiment of a printing apparatus according to the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram showing an example of a printing apparatus according to the present invention. First, as shown in FIG. 1, this printing apparatus includes, as a printing mechanism, first and second plate cylinders 1 and 2 for holding a printing plate, and first and second plate cylinders for transferring an ink image from each plate cylinder. The second blanket cylinders 3 and 4, the impression cylinder 5 that holds the printing paper and transfers the ink image from the blanket cylinders 3 and 4, and the paper feed cylinder 6 that supplies or discharges the printing paper to the impression cylinder 5. Also, a dampening water supply means 8 and an ink supply means 9 for supplying dampening water or ink to the discharge cylinder 7 and the printing plates on the first and second plate cylinders 1 and 2.
And a paper feed unit 10 for sequentially feeding the stacked unprinted printing papers and a paper discharge unit 11 for sequentially stacking the printed printing papers.

On the other hand, this printing apparatus has a plate making mechanism,
A printing plate supply unit 12 that supplies an unexposed printing plate to the first and second plate cylinders 1 and 2, an image recording unit 13 that records an image on the printing plate on the plate cylinder, and an image is recorded. The developing unit 14 for developing the printed printing plate and the printing plate discharging unit 15 for discharging the used printing plate are provided.

Further, the printing apparatus includes an image reading apparatus 16 for picking up an image on a printed printing sheet to measure the image density, and a cleaning apparatus 17 for cleaning the blanket cylinder.
And a control device 18 for controlling the entire printing apparatus.

The details of each of the above parts will be described below.
The first plate cylinder 1 is driven by a plate cylinder drive mechanism (not shown).
Is configured to be movable between a first printing position indicated by a solid line and an image recording position indicated by a chain double-dashed line, and the second plate cylinder 2 is similarly moved by a plate cylinder drive mechanism (not shown). It is configured to be movable between the second printing position indicated by the solid line 1 and the image recording position indicated by the chain double-dashed line.
That is, the first and second plate cylinders 1 and 2 are arranged at the first or second printing position respectively when performing a printing operation, and are alternately arranged at the image recording position when performing a plate making operation. The plate making process of the printing plate is performed on each plate cylinder. Each of the first plate cylinder 1 and the second plate cylinder 2 has a peripheral surface capable of holding a printing plate for two colors, and each printing plate is fixed at a position facing each other by 180 degrees on the peripheral surface. It has a holding means for doing.

The first blanket cylinder 3 is constructed so as to rotate in contact with the first plate cylinder 1 at the first printing position, and similarly for the second blanket cylinder 4 the second blanket cylinder 4 also has the second printing position. It is configured so as to come into contact with the second plate cylinder 2 and rotate at the printing position. This first and second
The blanket cylinders 3 and 4 have the same diameter as the first and second plate cylinders 1 and 2, and a blanket capable of transferring ink images of two colors from each plate cylinder is mounted on the peripheral surface thereof. There is.

The impression cylinder 5 includes the first and second plate cylinders 1,
It has a diameter of 1/2 of 2, and is configured to rotate in contact with both the first and second blanket cylinders 3, 4. The impression cylinder 5 is provided with gripping means capable of holding one printing sheet of a size corresponding to the printing plate. This gripping means can be opened and closed at a predetermined timing by an opening / closing mechanism (not shown) to hold the front end of the printing paper.

The paper feed cylinder 6 and the paper discharge cylinder 7 have the same diameter as the impression cylinder 5, and are provided with gripping means (not shown) similar to the gripping means provided in the pressure cylinder 5. The gripping means of the paper feed cylinder 6 is arranged so as to deliver the printing paper in synchronism with the gripping means of the impression cylinder 5, and the gripping means of the discharge cylinder 7 is the gripping means of the impression cylinder 5. It is arranged to receive the printing paper in synchronism with the printing means.

The first and second plate cylinders 1 and 2 arranged at the first and second printing positions, the first and second blanket cylinders 3 and 4, the impression cylinder 5, and the paper feed cylinder. 6 and the discharge cylinder 7 are rotationally driven in synchronization by a print driving motor (not shown). In addition, in the printing apparatus of the present embodiment,
Since the plate cylinders 1 and 2 and the blanket cylinders 3 and 4 have twice the perimeter of the impression cylinder 5, the impression cylinder makes two revolutions each time the plate cylinders 1 and 2 and the blanket cylinders 3 and 4 make one revolution. Therefore, when the impression cylinder 5 rotates twice while holding the printing paper, multicolor printing of a total of four colors of two colors + two colors can be performed from the first and second plate cylinders 1 and 2.

Two sets of dampening water supply means 8 are arranged for each of the plate cylinders 1 and 2 at the first and second printing positions, and two sets of printing plates are provided on each plate cylinder 1 and 2. The dampening water can be supplied selectively. This dampening water supply means 8 is composed of a dam boat that stores dampening water, and a dampening water roller group that pumps the dampening water in the dam boat and transfers it to the printing plate surface.
Of the dampening water rollers, at least the roller that contacts the printing plate surface is configured to contact or separate from the plate cylinder surface by the cam mechanism. If the printing plate is of a type that does not require dampening water, the dampening water supply means 8 is not necessary.

Two sets of ink supply means 9 are arranged for each of the plate cylinders 1 and 2 at the first and second printing positions, and are selected for the two printing plates on each plate cylinder 1 and 2. Ink of different colors can be supplied. The ink supply means 9 is provided with an ink fountain means capable of adjusting the ink supply amount for each of a plurality of areas in the printing width direction, and the ink ejected from the ink fountain means is passed through a plurality of ink rollers to form a plate. Supply to the printing plate surface on the cylinder. That is, at least a roller of the ink roller that contacts the printing plate surface is configured to contact or separate from the plate cylinder surface by the cam mechanism.

The inks of the respective ink supply means 9 are, for example, K color (black) and M color (magenta) ink supply means 8 are arranged for the first plate cylinder 1 and the second plate cylinder. For C, ink supply means 8 for C color (cyan) and Y color (yellow) are arranged. Further, some of the dampening water supply means 8 and the ink supply means 9 are constructed so as to be able to be retracted from the movement path thereof as the first and second plate cylinders 1 and 2 move.

The paper feed unit 10 takes out the print papers one by one from the pile in which the unused print papers are stacked and delivers the print papers to the paper feed cylinder 6. In the present embodiment, the paper feed cylinder is rotated twice. It operates to supply the printing paper once every time. On the other hand, the paper discharge unit 11 receives and stacks the printed print paper from the paper discharge cylinder 7. The paper discharge unit 11 is composed of a well-known chain transport mechanism, and grips the leading end of the printing paper by the gripping claws circulated by the chain and discharges and transports it. An image reading device 16 is provided in the middle of the movement path along which the printed matter is discharged by the paper discharge unit 11.

Next, the plate making mechanism of this printing apparatus will be described. In this printing apparatus, when performing the plate making operation, the first and second plate cylinders 1 and 2 are alternately moved to the image recording position. At this image recording position, a friction roller (not shown) is configured to abut the plate cylinder and rotate.

The printing plate supply unit 12 is a cassette roll in which a roll-shaped unexposed printing plate is shielded from light and is stored, a carrying roller and a carrying guide for carrying the drawn printing plate to the plate cylinders 1 and 2, and the printing plate. And a cutting means for cutting the sheet into a sheet. In this embodiment, a silver salt sensitive material is used as the printing plate, and an image is recorded by laser light. The printing plate supply operation procedure is as follows. First, the front end of the printing plate pulled out from the cassette roll is clamped by holding means (not shown) of the plate cylinders 1 and 2, and printing is performed by rotating the plate cylinders 1 and 2 in this state. Wind the plate on the plate cylinders 1 and 2,
After that, the printing plate is cut into a predetermined length and the trailing edge of the printing plate is sandwiched by the other gripping means.

The image recording section 13 is for turning the laser light on / of.
The image is recorded on the printing plate by exposing the printing plate by f. In this embodiment, the position of the image on the printing plate is determined by the control device 18, and the corresponding image data is sent to the image recording unit 13. Then, in the image recording unit 13, the laser light emitted from the laser transmission source is mainly scanned along the axial direction of the plate cylinder by a polarizer such as a polygon mirror, and the printing plate surface is sub-scanned by rotating the plate cylinder. It is configured. The scanning method may be a method in which a plurality of laser beams are arranged side by side in the axial direction of the plate cylinder and main scanning is performed as the plate cylinder rotates. Further, the printing plate and the image recording unit 13 may not only record an image by exposure, but may record an image by heat or other processing.

The developing section 14 develops the printing plate exposed by the image recording section 13. In this embodiment, the developing unit 14 is configured to scoop up the processing liquid stored in the processing tank with a coating roller and apply it to a printing plate to perform a developing process. Elevating means for moving to a position close to the trunk is provided. The developing unit 14 itself may be omitted if an image recording method that does not require development processing is adopted.

In this printing apparatus, the first and second plate cylinders 1 and 2 are moved to the image recording position, the printing plate is supplied, the image is recorded and developed, and the plate making operation is performed. When the plate making work is completed, the first and second plate cylinders 1 and 2 are put into the first
And it can arrange | position in a 2nd printing position and can print.

On the other hand, this printing apparatus can automatically eject the printing plate after the printing operation is completed. In this embodiment, the printing plate discharge unit 15 includes a peeling unit that peels the printing plate from the plate cylinder at the image recording position, a conveying unit that conveys the peeled printing plate, and a used used printing plate that has been conveyed. And a discharge cassette for discharging.

Next, details of the image reading device 16 are shown in FIG.
This will be described with reference to the schematic diagram shown in. The image reading device 16 is
Claw 2 that is circulated by the chain 20 of the paper output unit 11
The image on the printing paper p nipped and conveyed by the sheet 1 is read. The image reading device 16 uses the printing paper p.
An illumination light source 22 for illuminating the sheet and a reading section body 23 for receiving the reflected light from the printing paper p and converting it into an image signal.

The illumination light source 22 is composed of a plurality of linear light sources provided along the width direction of the printing paper p, such as a fluorescent lamp. The reading section main body 23 includes a cover 25 having a transmission section 24 for allowing reflected light to pass therethrough, a reflection mirror 26 provided in the cover 25, an optical system 27, and a light receiving element 28.
Consists of.

The cover 25 is for blocking ambient light, dust and ink mist. The transmissive portion 24 may be shielded by a translucent member, but may be opened. When it is opened, it is preferable to introduce clean air from the outside of the printing machine into the inside to prevent dust from entering through the permeation section 24. The reflection mirror guides the light incident from the printed matter to the light receiving element 28. The optical system 27 includes an optical system member such as a lens for focusing incident light on the light receiving element 28. The light receiving element 28 is a CCD line sensor capable of reading a print image line by line along the width direction of the printing paper p. In this embodiment, a 3-line CCD element capable of reading three wavelengths of RGB is adopted. is doing.

Since the print sheet p conveyed by the gripper claw 21 is conveyed while being sucked by the vacuum suction roller 29, fluttering of the print sheet p can be suppressed and stabilized during image reading.

It is preferable that a predetermined color chart is formed in advance on the printing paper by the image recording unit 13 for each ink key area. For example, as shown in FIG. 6, as a general example, 100 for each color of CMYK at the end of the image (generally, the rear end side of the printing paper) for each ink key area z.
A solid patch b of% density is formed. The image reading device 1
6 can take an image of the solid patch b and measure the print density of each ink key area. As a color chart, other% density halftone dot patches, line patches,
Alternatively, a mixed color patch such as gray may be formed and each print density or colorimetric value may be measured. Of course, when a color chart or the like is not added, the print image itself may be imaged to measure the print density or print color of a predetermined area.

The cleaning device 17 contacts the blanket cylinder and cleans the surface of the cylinder. In this embodiment, each of the blanket cylinders 3 and 4 is provided with a separate cleaning device. The cleaning device 17 includes a cleaning liquid supply unit and a cleaning cloth wiping unit.

The control device 18 is a microcomputer system including various input / output means and storage means, and is stored inside the printing apparatus. The control device 18 controls the entire printing device based on a predetermined program operation, and the control device 18 also controls the image reading device 16 and the ink supply means 9.

That is, the control means 18 controls the image reading device 16 so as to read the image on the printing paper p for each preset number of prints. Further, the control means 18 measures the YMCK print density for each area from the imaged data, and the ink supply means 9, in this case, the ink key opening of the ink fountain means so that the measured print density matches the preset target print density. , Control. In this embodiment, the reading and measurement are performed every five sheets of printing paper, but this is a frequency that is substantially impossible unless a measuring device is provided on the machine.

On the other hand, the control device 18 is the image reading device 1
It also functions as an arithmetic unit that performs arithmetic processing on the image read by the control unit 6. When this arithmetic processing is performed, desired measurement data is calculated from the imaged data obtained by the image reading device 16. In this embodiment, the RGB image pickup data obtained by the image reading device 16 is converted into YMCK based on a known conversion formula.
Convert to image data converted to density. This makes it possible to obtain the print density for each YMCK color of the solid patch provided in each ink key area.

FIG. 3 is a block diagram according to the present invention. In the figure, the control device 18 is the image reading device 16
, The storage means 30, the display means 31, and the input means 32. The control unit 18 captures an image with the image reading device 16 for each preset number of prints, and calculates measurement data such as print density from the obtained image data.
The measurement data is stored in the storage means 30 including a hard disk and a memory. The storage unit 30 also functions as a unit for storing the target print density for controlling the ink supply amount.

The display means 31 is a CRT, a liquid crystal monitor or the like, and can display the measurement data and the like.
The input unit 32 includes a keyboard and a mouse, and an operator can input various conditions and set instructions to the control device 18. In the printing apparatus of this embodiment, a liquid crystal monitor having a touch panel input function is adopted as the display unit 31 and the input unit 32, and they are integrally configured. For example, FIGS. 4 and 5 show the display means 31.
It is an example of a screen displayed by. Hereinafter, FIG. 4 and FIG.
The manual control procedure according to the present invention will be described using the screen display of FIG.

First, FIG. 4 is a display screen showing the control of dampening water and ink during the printing operation. In the figure,
At the left end of the screen, a water state display 40 indicating the control state of the dampening water amount by each dampening water supply means 8 is arranged. Each water state display 40 is provided for CMYK colors in order, and the appropriateness of the dampening water amount is indicated in each water state display 40.
A water monitor display 41 for displaying in stages and a key 42 for manually adjusting the dampening water supply amount up and down are provided. The control of the amount of dampening water is omitted here.

In the upper half of the screen, an ink key opening degree display 43 for each area is displayed for each color in the order of CMYK as an indication of the ink supply amount. Here, the current setting of the ink supply amount can be known in the numerical display and bar graph display for each area. The number of areas (the number of ink keys) in this example is 12.

In the lower half of the screen, a display 44 of the measured print density is displayed for each area in the order of CMYK colors. In the print density display 44, a preset target print density display 45 is provided on the left side. The target print density is input and set by the input means 32, and the storage means 30 is used.
Remembered in. In controlling the ink supply amount, the measured print densities are controlled so as to match the stored target print densities. The target print density can be changed even during the printing operation, and the control based on the target print density is performed from the time when it is changed in almost real time.

In this example, the target print density is C color 1.
5, M color 1.4, Y color 1.3, and K color 1.8, and each print density display 44 is ± 0.
The bar is displayed in the range of 5. If the bar indicating the current measured print density is above the center line indicating the target print density, the density is high, and if it is below the center line, the density is low. In addition, the color of the bar can be varied from green (small difference) to red (large difference) depending on the size of the difference from the target print density, thus improving the visibility.

Three keys 46 to 48 for setting the print control mode are displayed on the lower left side of the screen. Here, the key 46 is a manual control key for manually setting the dampening water and the ink. The key 47 is a key for automatically controlling only ink, and the key 48 is a key for automatically controlling both dampening water and ink. Generally, the key 48 automatically controls both the ink and the dampening water, but as described above, when it is desired to change the color tone of a part of the pattern, the key 46 is used to manually set the ink supply amount. At the bottom center of the screen, the setting takeover key 49 for manual control is displayed.
Is displayed. The explanation of other keys is omitted.

Next, the manual control according to the present invention will be described. When the key 46 is pressed in FIG. 4, the screen moves to the manual control screen shown in FIG. In FIG. 5, the measured print density 50 for each area is displayed in the upper half of the screen. The measurement print density display 50 is almost the same as the display 44, but the display range is enlarged in the vertical direction for easy understanding. On the other hand, a display 51 for manually adjusting the ink supply amount is provided at the bottom of the screen. Display 51
First, a color selection key 52 for selecting a color to be manually adjusted from CMYK colors, a ratio display 53 for displaying a ratio (% of the adjustment unit) for adjusting the ink supply amount, and a ratio adjustment key for vertically adjusting the ratio. 54, a selection range adjustment key 55 for adjusting the ink supply amount in the selected area.

On the other hand, above the display 50, No. 1
From the key of No. Area designation keys 56 for designating areas up to the 12 keys are displayed. Further, between the display 50 and the display 51, a display 57 of the ink key opening indicating the current ink supply amount of the color designated by the color selection key 52 is displayed.

On this manual control screen, the color to be adjusted is first selected with the color selection key 52. Then, the ratio for adjustment is set with the ratio adjustment key 54. For example, the ratio is set to 10% or the like here.

Next, the area of the key to be changed is designated by the area designation key 56. Here, two or more areas may be designated at the same time, or if necessary, the all selection key 58 may be pressed to designate all areas. The designated area is appropriately displayed in reverse video or the like.

Next, the selection range adjustment key 56 is pressed to increase or decrease the ink supply amount in the selected area. Here, each time the selection range adjustment key 56 is pressed, the ink key opening is adjusted by an amount corresponding to the above ratio. If the adjustment based on the ratio is adopted as described above, there is an advantage that the adjusted color tone is increased or decreased to substantially the same level regardless of the size of the key opening. The manually set ink key opening is displayed on the display 57 and is also stored in the storage unit 30 for each color and each area.

In the above, all the selected areas are collectively changed by pressing the selection range adjusting key 56. In addition to this, by pressing the print density display 50 of each key, the ink key opening of each key is ± 1. It is set so that it can be adjusted one by one. For example, if the upper half of the bar indicating the target print density in the print density display 50 is pressed as indicated by the symbol a, the opening degree of the second key is increased by 1, and the lower half of the bar is depressed as indicated by the symbol b. For example, the opening degree of the second key can be decreased by 1.

When all the manual settings are completed, the return button at the upper left of the screen is pressed to return to the screen of FIG. When the automatic control key 47 or 48 is pressed while the manual control setting takeover key 49 is pressed on the screen of FIG. 4, the manual setting set on the manual control screen is validated and the automatic control operation is performed.

That is, normally, the printing operation is performed while automatically adjusting the ink key opening so that the measured print density of each area matches the preset target print density, but the manual control is performed as described above. When the setting is taken over, the control is continued in the manually set area with the measured print density for the set ink key opening as the new target print density.

For example, the operator manually adjusts the ink key opening. With this adjustment, the print density changes, and when the measured print density of the corresponding area reaches the density intended by the operator, the automatic control key 47 or 48 is pressed to continue the automatic control. When the automatic control operation is performed by this operation, in the area where the ink key opening is manually adjusted, the measured print density of the area is stored in the storage unit 30 as a new target print density, and the automatic control is continued. As a result, even if the color tone is partially set manually, it can be reflected in the automatic control of the ink supply amount.

Generally, there is a delay of a predetermined number of sheets until the print density changes after changing the ink key opening. For this reason, it is preferable that the operator considers the time until the measured print density converges to a constant value after the ink key opening is manually adjusted, and then the automatic control is performed. However, the control device 18 may obtain a measured print density after a predetermined number of sheets from the time when the ink key opening is adjusted and automatically set it as a new target print density.

In the above description, since it is determined whether or not the manual setting is valid depending on whether the setting takeover key 49 is pressed, if the setting takeover key 49 is not pressed, normal automatic control is performed. It This setting takeover key 49
The advantage of using is that even if it is necessary to restore the original automatic setting, it can be easily handled.

On the other hand, in the above embodiment, the ink key opening itself for each area is adjusted by manual control, but the target print density may be individually changed for each area. In this case, the target print density of the corresponding area stored in the storage unit 30 may be changed from the preset target print density according to an instruction from the input unit 32.

[0061]

According to the present invention, since the condition set by the manual control can be prioritized and taken over by the automatic control,
It is possible to easily change the color tone partially.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an example of a printing apparatus according to the present invention.

FIG. 2 is a schematic diagram of an image reading device provided in a printing device.

FIG. 3 is a block diagram of a main part of the printing apparatus according to the present invention.

FIG. 4 is an example of a screen display for controlling the ink supply amount.

FIG. 5 is an example of a screen display for manually controlling the ink supply amount.

FIG. 6 is an explanatory diagram showing an example in which a solid patch is added to printing paper.

[Explanation of symbols]

1 First plate cylinder 2 Second plate cylinder 3 first blanket body 4 Second blanket body 5 impression cylinder 16 Image reader 18 Control device 31 display means 32 input means

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Shigeo Murakami             4-chome Tenjin, which runs up to Teranouchi, Horikawa-dori, Kamigyo-ku, Kyoto             1 Kitamachi No. 1 Dai Nippon Screen Manufacturing Co., Ltd.             Inside the company F-term (reference) 2C250 DB05 DB06 EA23 EB46

Claims (8)

[Claims] 1. An ink supply means capable of supplying a desired amount of ink to a plurality of areas in the print width direction, a target print density setting means for setting a target print density for all areas, and a printed material conveyance path. An image reading unit for obtaining image pickup data of a printed matter, a measured print density calculation unit for processing the imaged data to calculate a measured print density of the printed matter for each area, and a measured print density of each area for the target print An ink supply amount control means for controlling the ink supply amount supplied by the ink supply means so as to have a density, and an ink supply amount changing means capable of manually changing the ink supply amount for each area. In the area changed by the ink supply amount changing means, the ink supply amount control means controls the ink supply amount based on the changed ink supply amount. Printing device. 2. The printing apparatus according to claim 1, wherein the ink supply amount changing unit is configured to increase or decrease the set ink supply amount at a predetermined rate. 3. The ink supply amount changing means includes ratio setting means for setting the ratio, and an increase / decrease key for increasing / decreasing the ink supply amount for each area, and is set each time the increase / decrease key is pressed. The printing apparatus according to claim 2, wherein the ink supply amount is increased / decreased at a predetermined ratio. 4. The ink supply amount control means includes a setting key for determining whether to control the ink supply means according to the ink supply amount changed by the ink supply amount changing means. The printing device according to any one of 1 to 3. 5. The printing apparatus according to claim 1, wherein the target print density can be changed during printing. 6. The ink supply amount changing means changes the ink supply amount by changing the target print density for each area.
The printing device according to any one of 1. 7. An ink supply means capable of supplying a desired amount of ink to a plurality of areas in the print width direction, a target print density setting means for setting a target print density for all areas, and a printed material conveyance path. An image reading unit for obtaining image pickup data of a printed matter, a measured print density calculation unit for processing the imaged data to calculate a measured print density of the printed matter for each area, and a measured print density of each area for the target print Ink supply amount control means for calculating the ink supply amount for each area so as to match the density and controlling the ink supply means based on the calculated ink supply amount, and the ink supply amount for each area manually And an ink supply amount changing means capable of changing the ink supply amount, and a storage means for storing the measured print density of the area where the ink supply amount is changed as a new target print density And a printing device. 8. An ink supply means capable of supplying a desired amount of ink to a plurality of areas in the print width direction, a target print density setting means for setting a target print density for all areas, and a printed material conveyance path. An image reading unit for obtaining image pickup data of a printed matter, a measured print density calculation unit for processing the imaged data to calculate a measured print density of the printed matter for each area, and a measured print density of each area for the target print The ink supply amount for each area is calculated so as to match the density, the ink supply amount control means for controlling the ink supply means based on the calculated ink supply quantity, and the target print density for each area are changed. A printing apparatus comprising: a target print density changing unit capable of performing the change; and a storage unit that stores the changed target print density.