JP2022127812A - Intaglio printing machine with film thickness control mechanism - Google Patents

Abstract

To provide an intaglio printing machine that prints multi-sided printed matter having machine reading properties such as magnetic characteristics and optical characteristics, and that detects a film thickness of intaglio ink from functionality data and control it to a certain film thickness.SOLUTION: There is provided an intaglio printing machine comprising a film thickness control mechanism that comprises a pile for magnetic measurement which detects the amount of magnetism of an intaglio printed image included in multi-sided printed matter, and calculates a film thickness of the intaglio printed image from the amount of magnetism of the intaglio printed image obtained with the pile for magnetic measurement and also calculates a different from a previously input proper film thickness by making a comparison with the proper film thickness so as to control the film thickness of the intaglio image by moving a plurality of ink fountain keys forward or backward individually.SELECTED DRAWING: Figure 5

Description

The present invention relates to an intaglio printing press for printing security printed matter such as banknotes, securities, and various types of certificates, and in particular, information related to functionality such as magnetic properties formed on multiple facets by a multifaceted printing method. is detected on the printing press, and based on the detected information, a film thickness control mechanism automatically controls the printing film thickness of the intaglio ink on each face of the multi-sided printed matter (especially in the width direction perpendicular to the conveying direction). It relates to an intaglio printing press.

2. Description of the Related Art Various forgery prevention techniques are employed for security printed matter such as banknotes, securities, and various types of certificates to prevent forgery using a color copier or the like. In particular, intaglio printing, which forms a complicated image with raised lines, cannot be reproduced with a copy using a color copier or the like, so it is a technique with high resistance to counterfeiting.

In addition, since intaglio printed matter can be formed with a certain thickness or more, it is possible to add magnetic materials for the purpose of machine reading, and these functional materials enable authenticity determination by machine reading. However, when performing machine reading using a magnetic material contained in an intaglio printing image, the magnetic properties vary depending on the thickness of the intaglio ink, so the thickness of the intaglio ink formed on the printed matter should be kept within a certain range. There is a need.

In particular, various security printed materials such as banknotes and securities are printed by a multifaceted printing method, and then cut to regular dimensions to produce a single security printed material, which is widely used. In order to keep the film thickness of the formed intaglio ink within a certain range, it is necessary to keep the supply amount of the intaglio ink, the printing conditions, etc. within a certain range.

In addition, if the amount of ink supplied is too large, the probability of abnormal products such as scum drops due to this increases. Therefore, when adjusting the amount of intaglio ink supplied, the film thickness of the ink transferred onto the duct roller that supplies the intaglio ink is measured, and the amount of ink supplied is adjusted to adjust the film thickness on the printed matter. there is Generally, the ink film thickness is measured by using an object-contact type thickness gauge and manually contacting the duct roller by the printing operator to measure the ink film thickness. Since errors occur depending on the strength and strength of the measurement, there is a problem that skill is required to perform accurate measurements.

In addition, when measuring the film thickness of intaglio ink with an object-contact type thickness gauge, the thickness gauge is manually brought into contact with the duct roller rotating at high speed, which poses a problem in terms of work safety. Furthermore, when manufacturing security printed matter by the multi-sided printing method, it is necessary to keep the film thickness of the intaglio ink formed on each face in the width direction perpendicular to the conveying direction constant. It is necessary to measure and adjust the ink supply amount according to the measurement data, which poses a problem of poor workability.

The quality of security printed materials intended for authenticity determination by machine reading cannot be guaranteed only by adjusting the amount of ink supplied on the printing press. It is necessary to check whether there is variation in the film thickness of the intaglio ink formed on the multi-sided printed matter by performing measurements using a dedicated measuring device, and to adjust the amount of ink supplied. . In this method, the workload is heavy and it takes time to adjust the ink supply after measuring the sampled printed matter, so it takes time to reflect the measurement results on the printed matter. may occur.

As a device for controlling and stabilizing the amount of ink supplied in an intaglio printing press, for example, near the duct roller of an intaglio printing press, the ink film thickness is measured without contact by a two-dimensional laser displacement sensor, and the ink is supplied based on the measurement results. The present applicant has proposed an ink supply device for an intaglio printing press that automatically controls the amount (see, for example, Patent Document 1).

In addition, as a device for inspecting the magnetic quantity of printed matter on other printing presses, in printing presses that print with magnetic ink on web paper (hereinafter referred to as "web"), other than the main printing section on the web A pattern for magnetic and optical reading is formed in the margin, the magnetic characteristics and optical density are measured on the pattern, and only the optical density is measured on the main printing part, and the optical detected by the pattern and the main printing part A printed matter inspection method is disclosed in which the magnetic amount of the main printed portion is calculated from the density information and the correlation between the optical density and the magnetic amount obtained on the pattern (see, for example, Patent Document 2).

JP 2013-91247 A Japanese Patent Application Laid-Open No. 2002-347220

However, when the ink supply device of Patent Document 1 is used, the ink supply amount is controlled based on the ink film thickness on the duct roller, but the behavior of the ink film thickness on the duct roller affects the printed matter. It is not always reflected in the ink film thickness, and the transferability of the ink also changes depending on the state of various materials such as the ink and the roller, and the working environment. Therefore, it is difficult to accurately control the ink film thickness on the printed matter. In addition, since an ink film thickness measuring device with a two-dimensional laser displacement sensor is installed under the duct roller, the ink can be Film thickness cannot be measured. In addition, when installed under the duct roller, a large amount of ink scum falls on various sensors attached to film thickness measurement, and the problem remains that accurate ink film thickness cannot be measured.

In the print inspection method of Patent Document 2, patterns formed on both ends (margins) of a web conveyed with a constant tension are used, and the magnetism of the main print portion is estimated from the correlation between the magnetism and the optical density. Therefore, it cannot be said that an accurate amount of magnetism is being inspected. In addition, since the inspection device of Patent Document 2 uses a contact-type magnetic amount detection sensor, when it is used continuously for printed matter that forms a film thickness of a certain level or more such as ink that does not dry quickly or intaglio printing. , ink may adhere to the contact area of the sensor, preventing accurate measurement. Furthermore, when continuous printing is performed using sheets, the sheet flutters while being conveyed, so a contact type magnetic quantity detection sensor cannot be used for the pattern formed in the margin. Therefore, the problem of being limited to printing using the web has been left unsolved.

The present invention aims to solve the above-mentioned problems, and measures the amount of magnetism on the effective surface of a multi-sided printed matter using a non-contact magnetic sensor in a magnetic measurement pile for the printed matter immediately after printing. Then, it judges whether the amount of magnetism is within the standard value by comparing it with the standard value input in advance, and based on the result, it automatically controls the ink fountain key to accurately control the ink film thickness. It is. Furthermore, by providing a plurality of sensors for measuring the amount of magnetism contained in the ink above the duct roller or the inking roller, the amount of magnetism detected by the sensors can be used to measure the amount of ink transferred to the duct roller or inking roller. An intaglio printing machine provided with a film thickness control mechanism capable of determining whether or not the film thickness exceeds the upper limit value, and obtaining high quality intaglio printed matter reproducing the target amount of magnetism.

An intaglio printing machine equipped with a film thickness control mechanism according to the present invention is an intaglio printing machine equipped with a film thickness control mechanism for controlling the film thickness of intaglio ink from the amount of magnetism of an intaglio printing image formed on a multi-sided printed matter. The film thickness control mechanism includes a detection unit having a magnetic sensor for detecting the amount of magnetism of the intaglio printing image and a conversion device for calculating the film thickness of the intaglio printing image from the amount of magnetism detected by the magnetic sensor; Analysis that calculates the difference from the appropriate film thickness by a comparison device that compares the film thickness of the intaglio printing image calculated by the storage device that stores the appropriate film thickness as a reference and the conversion device with the appropriate film thickness stored in the storage device. and the appropriate film thickness calculated by the analysis unit, determine the advance or retreat distance individually for each of a plurality of ink fountain keys that can partially adjust the supply amount of intaglio ink. An intaglio plate equipped with a film thickness control mechanism, comprising at least a control section having a control judgment device and a driving section having a motor driving device for operating a plurality of ink fountain keys based on instructions from the control section. A printing press.

In addition, among the detection units of the intaglio printing machine equipped with the film thickness control mechanism of the present invention, the configuration for detecting the magnetic quantity includes a measurement table on which the printed multifaceted material immediately after printing is placed, A paper presence detection sensor that detects the presence or absence of the multi-sided printed matter placed on the measuring table, a paper position detection sensor that detects the position of the multi-sided printed matter placed on the measuring table, and a paper position detection sensor to place the multi-sided printed matter on the measuring table. and a film thickness control mechanism characterized by comprising at least an air injection section for floating the multi-sided printed matter by air when the position of the multi-sided printed matter is not a normal position, and a guiding portion for guiding the multi-sided printed matter to a reference position. It is an intaglio printing machine.

In addition, the control unit in the intaglio printing machine equipped with the film thickness control mechanism of the present invention has a machine learning function for correcting ink fountain key operation information based on the difference from the repeatedly calculated proper film thickness. It is an intaglio printing machine equipped with a characteristic film thickness control mechanism.

Further, the detection unit in the intaglio printing machine equipped with the film thickness control mechanism of the present invention detects the magnetic amount and/or optical characteristics of the intaglio ink above the duct roller and/or the inking roller that supplies the intaglio ink to the plate surface. An intaglio printing machine having a film thickness control mechanism, further comprising a mechanism for detecting and calculating the ink film thickness on the duct roller and/or the inking roller.

In the intaglio printing press equipped with the film thickness control mechanism of the present invention, a sampling pile for detecting the amount of magnetism is provided on the printing press, and by accurately detecting the amount of magnetism on the printed matter, the ink can be printed from accurate information on the amount of magnetism. Since the film thickness can be controlled, it is possible to reliably obtain a security printed matter that can be stably machine-readable. In addition, since it is not necessary to measure the ink film thickness on the duct roller with a contact-type thickness gauge, workability and safety can be improved, and work requiring skill can be eliminated.

In addition, the intaglio printing press equipped with the film thickness control mechanism of the present invention not only measures the amount of magnetism on the printed matter, but also measures the thickness of the ink film on the ink receiving roller or duct roller, thereby controlling the amount of excess ink. There is an effect that it is possible to prevent ink transfer failure and quality abnormality in the wiping portion caused by supply.

Furthermore, the intaglio printing press equipped with the film thickness control mechanism of the present invention can maintain the ink film thickness on the ink receiving roller or duct roller even in the state of being equipped with a mechanism for improving the quality of printed matter such as a sliding roller and a mist cover. can be accurately measured, it is possible to control the ink film thickness while maintaining the print quality.

Diagram showing an example of an intaglio printing machine The side view which shows an example of the intaglio printing part (c) in an intaglio printing press. A diagram showing an example of an intaglio printing section (c) of an intaglio printing machine viewed from above A diagram showing an example of a paper discharge section of an intaglio printing machine equipped with a film thickness control mechanism. A diagram showing an example of a film thickness control mechanism in a paper discharge unit. Flowchart showing the process up to the start of ink film thickness measurement FIG. 4 is a diagram showing an example of a configuration for measuring the magnetic amount of each surface formed on a multi-sided printed matter in a magnetic measurement unit (B); Block diagram showing an instruction system in the film thickness control mechanism of the present invention Flowchart showing the steps of the film thickness control mechanism of the present invention A side view of an intaglio printing unit (c) equipped with a magnetic sensor (1) for detecting the ink film thickness on the inking roller (2). A top view of an intaglio printing unit (c) equipped with a magnetic sensor (1) for detecting the thickness of the ink on the inking roller (2). A diagram showing an example of the positional relationship between the ink-applying roller (2) and the magnetic sensor (1). A side view of an intaglio printing unit (c) equipped with a magnetic sensor (1) for detecting the ink film thickness on the duct roller (5). A top view of an intaglio printing unit (c) equipped with a magnetic sensor (1) for detecting the ink film thickness on the duct roller (5). Flowchart showing the process of controlling the ink film thickness from the results of measuring the amount of magnetism on the magnetic measurement pile (f) and the results of measuring the amount of magnetism on the ink-receiving roller (2) or the duct roller (5).

Modes for carrying out the present invention will be described with reference to the drawings. If so, various other embodiments are included.

An example of an intaglio printing machine equipped with the film thickness measuring mechanism of the present invention will be described with reference to FIG. FIG. 1 shows an intaglio printing machine (A) capable of printing by a combination of offset printing and intaglio printing. a section (b), an intaglio printing section (c) for forming intaglio printing lines, a main pile (d) for discharging the printed paper, and a sampling pile (e) for checking the quality of the printed matter. , and a magnetic measurement pile (f) for measuring the amount of magnetism on the printed matter.

The film thickness control mechanism of the present invention relates to the intaglio printing portion (c) and the magnetic measurement pile (f) shown in FIG. As long as it is a machine, it is not limited to the configuration of the intaglio printing machine (A) shown in FIG.

2 and 3 show the details of the intaglio printing section (c) in the intaglio printing machine (A). As shown in FIGS. 2 and 3, the intaglio printing section (c) has a duct roller (5) that supplies intaglio ink (3), and applies ink from the duct roller (5) to the intaglio plate surface (7). An inking roller (2), an intaglio plate cylinder (6) that fixes the intaglio plate surface (7), and among the intaglio ink (3) transferred to the intaglio plate surface (7), the intaglio ink ( 3), and an impression cylinder (9) that applies pressure to transfer the intaglio ink (3) from the intaglio plate surface (7) to the conveyed paper.

The ink fountain (4) into which the intaglio ink (3) is put is provided with the duct roller (5), the ink mounting plate (10), and the duct rollers (5) on both sides of the ink mounting plate (10). It consists of the installed side plates (11). The thickness of the intaglio ink (3) is adjusted (ink transfer amount) by moving the ink fountain keys (12) located under the ink plate (10) back and forth to change the gap with the duct roller (5). Let me do it. The ink fountain key (12) is provided with an ink fountain keystroke gear (13). When the ink fountain keystroke gear (13) is turned clockwise, the ink fountain key (12) advances and reverses. It is designed to move backward when turned clockwise.

The intaglio printing machine (A) to which the present invention is directed is a sliding roller that evens out the intaglio ink (3) transferred to the duct roller (5) to the lower part of the duct roller (5) in order to improve image quality. (14), a tray (15) for receiving ink scum generated during printing, and scattering of intaglio ink (3) mist and ink scum generated between the inking roller (2) and the duct roller (5). A mist cover (16) may be installed to prevent By installing these mechanisms in the vicinity of the duct roller (5), an accurate amount of intaglio ink (3) can be supplied, and a tray (15) for scum of the intaglio ink (3) in contact with the mist cover (16). can be reliably collected, it is possible to suppress the cause of printing defects such as dregs.

As shown in FIG. 3, the intaglio printing section (c) has a duct roller (5) and an inking roller (2) fixed to a frame (26) of an intaglio printing machine (A) by a base shaft (25). In order to adjust the intaglio ink (3) supplied to the duct roller (5) in the direction of the base axis (25) of the duct roller (5), a plurality of ink fountain keys (12) and ink fountain keystroke gears are provided. (13) is attached. As a result, even if the ink film thickness on each face of a multifaceted printed matter formed in the direction of the base axis varies, it is possible to keep the ink supply constant by adjusting the plurality of ink fountain keys individually. Become.

The film thickness control mechanism in the present embodiment detects the amount of magnetism of the intaglio ink (3) transferred onto the printed matter in the magnetic measurement pile (f), and detects the film thickness of the intaglio ink (3) from the detected amount of magnetism. A detection unit for calculating the thickness is provided, and an analysis unit for comparing the ink film thickness on the printed matter obtained from the detection unit with the appropriate ink film thickness stored in the storage device (22), and the result obtained from the analysis unit. It comprises at least a control section for determining the direction and distance to operate the ink fountain key (12) to adjust the ink film thickness, and a drive section for driving the ink fountain key (12). Furthermore, the intaglio printing machine equipped with the film thickness measuring mechanism of the present invention measures the magnetism of the intaglio ink (3) transferred onto the duct roller (5) or the inking roller (2) in order to suppress printing troubles. It may be configured to detect and suppress printing troubles due to excessive ink transfer. In that case, the ink film thickness can be calculated by the above-described analyzing section from the magnetic quantity on the duct roller (5) or the ink receiving roller (2), and the driving section and the control section can be used together.

FIG. 4 shows the configuration around the main pile (d), the sampling pile (e) and the magnetic measurement pile (f) in the intaglio printing machine (A) of the present invention. The paper conveyed along the flow of the delivery chain (30) is divided into different piles depending on the application and discharged, and the main pile (d) where the printed matter is piled up and the printed matter used for color adjustment and quality confirmation. A sampling pile (e) that discharges , and a pile for magnetic measurement ( f).

FIG. 5 shows the film thickness control mechanism in the magnetic measurement pile (f) and the intaglio printing portion (c). The pile for magnetic measurement (f) includes a magnetic measurement section (B) that detects the amount of magnetism from the intaglio printing image formed on the printed matter, and each face of the multifaceted printed matter obtained by the magnetic measurement section (B). A conversion device (19) is provided for converting the above magnetic quantity into the film thickness of the intaglio ink (3). The magnetic measurement unit (B) includes a magnetic sensor (1), an air injection unit equipped with a measuring table (31) with air holes on which the conveyed printed matter is placed, and a measuring table (31) with air holes. a paper presence/absence detection sensor (32) for detecting , a paper position detection sensor (33) for detecting bending of the printed matter at the end of the measuring table with air holes (31), and a measuring table with air holes (31) It is configured to have at least a guiding portion consisting of a guide (34) for placing the paper on the side without bending. With these configurations, by adjusting the plurality of ink fountain keys (12) based on the ink film thickness information in the width direction of the multifaceted printed matter, the magnetic amount of the intaglio printing lines formed on the printed matter can be kept uniform. becomes possible.

Next, with reference to the flow chart of FIG. 6, the steps from transporting the sample paper for measurement to measuring the amount of magnetism in the magnetic measurement section (B) in the magnetic measurement pile (f) will be described.

First, the paper being printed is discharged at regular intervals (for example, 1/1,000 sheets) onto the pile (f) for magnetic measurement (STEP 1), and the discharged paper is placed on the measurement table (31) with air holes. , and the paper presence/absence detection sensor (32) detects that the paper has been placed (STEP 2). Next, the paper position detection sensor (33) for confirming whether the placed paper is tilted compared to the normal position is activated, and the printed matter does not bend on the measuring table (31) with air holes. Check if it is placed (STEP 3). Paper position detection sensors (33) are installed in at least three positions on the edge of the paper when the paper is placed in the normal position. The control unit determines that the paper is placed in the normal position, fixes the paper by air suction, and starts measurement (STEP 4).

If the paper position detection sensor (33) does not respond and it is determined that the paper is bent, air is ejected from the air holes to slightly float the paper (STEP 5). The floating sheet falls again along the guide (34) and is placed on the measuring table (31) with air holes (STEP 6). These steps are repeated until the paper position detection sensor (33) determines that the paper is placed at the correct position.

When the paper position detection sensor (33) responds and it is determined that the paper is placed at the correct position, air is sucked from the air holes, and the paper to be measured is fixed on the measuring table (31) with air holes. (STEP 4). After fixing the paper, the magnetic sensor (1) is activated to start measuring the magnetic amount of the intaglio ink (3) formed on the printed matter. The above is the process of measuring the amount of magnetism on the printed matter in the magnetic measurement pile (f).

Next, the operation of the magnetic measurement section (B) in the magnetic measurement pile (f) will be described with reference to FIG. According to the flow chart described above, the magnetic sensor (1) is lowered in the direction of the printed matter while the paper is fixed at the normal position until the distance from the printed matter is 0.5 to 1 mm. The lowered magnetic sensor (1) moves in a pre-registered operating direction (in the figure, the dashed arrow direction) while maintaining a distance from the printed matter, and measures the amount of magnetism on each face. Regarding the adjustment of the amount of ink supplied to the multi-sided printed matter, since the adjustment is made in the width direction perpendicular to the transport direction (S1) of the paper, it may be configured to measure the magnetic amount on all the facets of the paper. By measuring any row formed in the width direction (one of the three rows in the figure), it is possible to adjust the ink supply amount (ink fountain key) in the axial direction.

Regarding the operating principle and configuration (not shown) of the magnetic sensor (1), for example, as in the device described in Japanese Patent Application Laid-Open No. 2011-75439, a guide is provided in the moving direction, and the magnetic sensor (1) is It is sufficient that the magnetic sensor (1) is freely movable along the guide, and is not particularly limited as long as the movement of the magnetic sensor (1) can be accurately controlled. In addition, the magnetic sensor (1) is preferably configured so as to be able to simultaneously measure a plurality of lines of intaglio printing lines formed on each surface of the multi-sided printed matter. By arranging them, it is possible to accurately measure the amount of magnetism in a short time without scanning each surface of the paper multiple times.

Regarding the movement of the magnetic sensor (1), for example, the direction parallel to the frame (26) shown in FIG. . At the time of magnetic measurement, it is necessary to measure the amount of magnetism from the intaglio printing lines formed at the same position on the effective surface of the multi-sided printed matter. along the Z-axis direction guide (not shown) to the position where the distance between the magnetic sensor (1) and the printed matter is 0.5 to 1 mm, and the X-axis and Z-axis directions are fixed. By moving the magnetic sensor (1) along the guide in the Y-axis direction in this state, it is possible to accurately measure the amount of magnetism on the effective surface of the multi-sided printed matter.

FIG. 8 is a block diagram showing an instruction system in the film thickness control mechanism of the present invention. ), and compares the film thickness of the intaglio ink (3) with the reference value input in advance to the storage device (22). Then, an analysis unit for comparing whether the ink film thickness is appropriate, a control unit for judging adjustment values for the ink supply amount, etc., and advance of a plurality of ink fountain keys (12) formed in the width direction based on the judgment results. Or it is composed of a driving part for retracting. Each of them will be explained below.

The detection unit calculates the ink film thickness from the magnetism measuring pile (f) and a magnetic sensor (1) installed near a duct roller (5) or an ink-receiving roller (2), which will be described later, and the obtained magnetic quantity. It must have at least a conversion device (19) for The ink film thickness detected by the detection section is transmitted to the analysis section. The analysis section compares and collates the reference film thickness data previously input to the storage device (22) and the data converted into the ink film thickness by the detection section by means of the comparison device (21), and adjusts each ink fountain key (12). Numerical values are calculated, and upper and lower limits of the amount of magnetism for obtaining a reference ink film thickness are set and stored in a storage device (22). As for advancing and/or retracting the ink fountain key (12), the motor driving device (24) of the drive section is controlled via the control judgment device (23) in the control section until the ink film thickness stabilizes. , continue the operation.

Further, the analysis unit can perform fine adjustment of the ink supply amount by subjecting the information obtained by repeated measurement and adjustment to machine learning. By further providing these machine learning functions, the ink film thickness calculated from the magnetic quantity of the intaglio ink (3) formed on the printed matter and the adjustment of the ink fountain key (12) performed to adjust the ink film thickness Since the accuracy can be improved, further stabilization of quality is expected.

Next, the process of controlling the amount of ink supplied based on the amount of magnetism on the printed matter detected by the pile (f) for magnetic measurement will be described with reference to the flow chart of FIG. First, the magnetic sensor (1) in the detection unit (magnetism measurement unit (B)) detects the amount of magnetism from the intaglio pattern formed on the printed matter, and transmits information about the detected amount of magnetism to the conversion device (19). (STEP 1), and the conversion device (19) converts the magnetic quantity transmitted from the magnetic sensor (1) into the ink film thickness (STEP 2), and displays information such as the ink film thickness on the display monitor (20). (STEP2'). The analysis unit acquires appropriate ink film thickness information registered in advance in the storage device (22) (STEP 3'), and compares it with a reference ink film thickness in the comparison device (21) (STEP 3).

Next, the ink film thickness information compared by the comparison device (21) of the analysis section is sent to the control judgment device (23) of the control section to judge whether the ink film thickness is within the appropriate range (STEP 4). If the ink film thickness is within the reference range, the process returns to STEP 1 to continue the ink film thickness measurement in the detection section. When the ink film thickness exceeds the proper range, information is sent from the control judgment device (23) to the motor drive device (24), and the ink fountain key (12) in the portion where the ink film thickness exceeds is advanced. An instruction is sent (STEP 5). Conversely, if it falls below the appropriate range, the control judgment device (23) sends an instruction to the motor drive device (24) to move the ink fountain key (12) backward (STEP 5'). After adjusting the ink film thickness, the process returns to STEP 1 again to continue the ink film thickness measurement at the detection unit.

As described above, the amount of magnetism is measured from the intaglio printing line on the printed material detected in the magnetic measurement pile (f), converted to the ink film thickness, compared with the reference film thickness, and the ink discharge amount is automatically calculated. It is an embodiment of an intaglio printing machine (A) provided with a film thickness control mechanism that adjusts by . In the present invention, magnetic data on the printed matter is detected in the magnetic measurement pile (f), and the supply amount of the intaglio ink (3) is controlled based on the detected magnetic data. It is also possible to use a sensor that extracts and other functional data to evaluate printed matter and control the amount of intaglio ink or other printing ink output or printing conditions based on the evaluation results.

Next, in order to suppress printing troubles caused by excessive supply of the intaglio ink (3), the amount of magnetism of the intaglio ink (3) transferred onto the duct roller (5) or the inking roller (2) is used to determine whether the duct roller (5) Or a mechanism for calculating the ink film thickness on the ink receiving roller (2) and transmitting it to the analysis unit as accompanying information used for adjusting the ink supply amount will be described.

10 and 11 show a film thickness control mechanism for calculating the ink film thickness from the amount of magnetism present in the intaglio ink (3) transferred onto the inking roller (2). By grasping the amount of magnetism of the intaglio ink (3) transferred to the inking roller (2), it is possible to measure the amount of magnetism of the intaglio ink (3) immediately before it is transferred to the intaglio plate surface (7), so that more accurate information can be obtained. is obtained.

The magnetic sensor (1) shown in FIG. 11 has a measuring device mounting shaft (17) installed between frames (26) in the space above the inking roller (2), and from the measuring device mounting shaft (17) It is installed vertically with respect to the axis of the inking roller (2). The magnetic amount data obtained by the magnetic sensor (1) is converted into an ink film thickness by a conversion device (19) attached to the film thickness control mechanism, and displayed on the display unit.

The display unit has a display monitor (20) for displaying the ink film thickness calculated by the detection unit, preset reference data and setting conditions, etc., and displays the intaglio ink (3) transferred to the ink receiving roller (2). It is configured to visualize the film thickness. In the present invention, the ink film thickness is calculated from data such as the detected magnetic quantity, and is compared with a reference value to automatically adjust the ink fountain key (12) to keep the ink film thickness on the printed matter constant. However, the ink film thickness detected from the magnetic measurement pile (f) used in the present invention and the ink film thickness on the ink receiving roller (2) and/or the duct roller (5) are displayed on the display monitor (20). The numerical value may be used by the printing operator to manually adjust the ink fountain key (12). In addition, when the ink film thickness is out of the reference range in advance, an alarm may be issued, or both the display monitor (20) and the alarm may be issued.

FIG. 12 shows a state in which the magnetic sensor (1) is installed on the ink receiving roller (2). As shown in FIG. 12(a), the magnetic sensor (1) is installed in a vertical direction with respect to the inking roller (2), and is installed at a position with a distance of about 1 to 2 mm from the inking roller (2). . Also, depending on the magnetic sensor (1) used, it may be necessary to change the distance from the inking roller (2), so a length adjusting jig (18) is attached to the measuring device mounting shaft (17). Regarding the magnetic sensor (1), as shown in FIG. 12, when printing a multi-sided printed matter, the amount of ink transfer varies in the axial direction, so it is preferable to install a plurality of magnetic sensors (1). , the number of rollers to be installed may be determined according to the coefficient of thermal expansion of each roller, the number of sheets, and the printing image.

When used for printing multifaceted printed matter, a pattern roller that transfers ink only to the print pattern may be used. In that case, as shown in FIG. The inking roller (2') is provided with a film thickness measuring section (28) in addition to the image area (27) and the non-image area (29), and a magnetic sensor ( By installing 1), the ink film thickness of the inking roller (2) can be measured in a state in which the amount of intaglio ink (3) used is greatly reduced, which is more preferable.

13 and 14 show a configuration for measuring the amount of magnetism present in the intaglio ink (3) transferred to the duct roller (5). Basically, a magnetic sensor ( 1) is installed, the measuring device mounting shaft (17) is installed between the frames (26) in the space above the duct roller (5), and the measuring device mounting shaft (17) is connected to the duct The magnetic sensor (1) may be used by attaching it vertically to the axis of the roller (5).

In this embodiment, the magnetic sensor (1) is used as a sensor for detecting the film thickness of the intaglio ink (3) transferred onto the inking roller (2) or the duct roller (5). However, any sensor may be used as long as it can detect the film thickness of the intaglio ink (3) transferred onto the inking roller (2) or duct roller (5) in a non-contact manner. Laser variation sensors, other optical sensors, and the like can be used.

Next, the process of controlling the ink film thickness based on the results of measuring the amount of magnetism on the magnetic measurement pile (f) and the results of measuring the amount of magnetism on the ink-receiving roller (2) or the duct roller (5) is shown in FIG. 15 flow charts. Since the detailed steps in the magnetic measurement pile (f) are as described above, the detailed description is omitted.

First, in the magnetic measurement pile (f), the magnetic amount of the intaglio ink (3) transferred onto the printed matter is measured (STEP 1). An upper limit and a lower limit are set for the appropriate ink range. If the upper limit is exceeded, the amount of ink supplied is reduced (STEP 1'), and if the amount is below the lower limit, the amount of ink is increased (STEP 1'). ´).

Next, when it is determined in STEP 1 that the ink film thickness is within the proper range, the amount of magnetism on the ink receiving roller (2) or the duct roller (5) is measured (STEP 2). This is done for the purpose of preventing the occurrence of quality anomalies due to oversupply of ink, which cannot be judged by the ink film thickness on the printed matter. Only the upper limit value is set for the magnetic amount measuring device near the ink-receiving roller (2) or the duct roller (5), and it is determined whether the ink film thickness exceeds the upper limit value. In STEP 1, even if the amount of magnetism of the intaglio ink (3) on the printed matter is within the appropriate range, if the ink film thickness on the inking roller or duct roller exceeds the upper limit, the ink film thickness on the printed matter will be Reduce the ink discharge amount within a range that does not deviate from the appropriate range (STEP 2').

After adjusting the ink film thickness based on the measurement results in STEP 1 and STEP 2, return to STEP 1 and perform the magnetic quantity measurement again in the pile for magnetic measurement. This is a more preferable form because it is possible to control the film thickness of the intaglio ink on the printed matter while suppressing the

1 Magnetic sensor 2, 2' Inking roller 3 Intaglio ink 4 Ink fountain 5 Duct roller 6 Intaglio plate cylinder 7 Intaglio plate surface 8 Wiping roller 9 Impression cylinder 10 Ink mounting plate 11 Side plate 12 Ink fountain key 13 Ink fountain keystroke gear 14 Sliding roller 15 Receptacle 16 Mist cover 17 Measuring device mounting shaft 18 Length adjusting jig 19 Conversion device 20 Display monitor 21 Comparison device 22 Storage device 23 Control judgment device 24 Motor drive device 25 Base shaft 26 Frame 27 Image part 28 Film Thickness measuring section 29 Non-image section 30 Delivery chain 31 Measuring table with air holes 32 Paper presence/absence detection sensor 33 Paper position detection sensor 34 Guide A Intaglio printing machine B Magnetic measurement section a Paper feeding section b Offset printing section c Intaglio printing section d Main pile e Sampling pile f Pile for magnetic measurement

Claims (4)

An intaglio printing machine having a film thickness control mechanism for controlling the film thickness of intaglio ink based on the amount of magnetism of an intaglio printing image formed on a multifaceted printed matter,
The film thickness control mechanism includes a detection unit having a magnetic sensor for detecting the amount of magnetism of the intaglio printing image and a converting device for calculating the film thickness of the intaglio printing image from the amount of magnetism detected by the magnetic sensor. ,
A storage device for storing a reference appropriate film thickness in advance and a comparison device for comparing the film thickness of the intaglio printing image calculated by the converting device with the appropriate film thickness stored in the storage device. an analysis unit that calculates the difference between
Based on the difference from the appropriate film thickness calculated by the analysis unit, a distance to advance or retreat is individually determined for each of a plurality of ink fountain keys capable of partially adjusting the supply amount of the intaglio ink. a control unit having a control decision device;
An intaglio printing machine having a film thickness control mechanism, comprising at least a driving section having a motor driving device for operating a plurality of ink fountain keys based on instructions from the control section. The detection unit includes a measuring table on which the multi-sided printed matter immediately after being printed and conveyed by the intaglio printing machine is placed;
a paper presence/absence detection sensor that detects the presence/absence of the multi-sided printed material placed on the measuring table;
a paper position detection sensor that detects the position of the multi-sided printed matter placed on the measuring table;
an air injection unit that floats the multi-sided printed matter with air when the position of the multi-sided printed matter placed on the measuring table by the paper position detection sensor is not a normal position;
2. An intaglio printing machine having a film thickness control mechanism according to claim 1, further comprising at least a guiding section for guiding said multi-sided printed matter to a reference position. 3. The film thickness control according to claim 1, wherein said control unit has a machine learning function for correcting operation information of said ink fountain key based on a difference from said appropriate film thickness which is repeatedly calculated. An intaglio printing machine equipped with a mechanism. The detection unit detects the magnetic amount and/or optical characteristics of the intaglio ink above the duct roller and/or the inking roller that supplies the intaglio ink to the plate surface, and detects the magnetic amount and/or optical characteristics of the intaglio ink. 4. An intaglio printing press having a film thickness control mechanism according to claim 1, further comprising a mechanism for calculating the ink film thickness.

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