Printing press pressure management system

Abstract

This invention provides a printing pressure management system for a printing press that enables accurate measurement of the thickness of the finishing material in the part of the printing press that presses against the printing surface of the sheet. [Solution] The printing pressure management system for a printing press of the present invention is characterized by comprising: a measuring unit that measures the distance to the surface of the finishing material that presses the printing surface of the sheet; a storage unit that stores at least the lower limit of the amount of finishing material to be prepared and the distance from the measuring unit to the surface of the impression cylinder to which the finishing material has not been prepared; a calculation unit that calculates the amount of finishing material to be prepared from the difference between the distance from the measuring unit to the surface of the impression cylinder to which the finishing material has not been prepared and the distance to the surface of the finishing material measured by the measuring unit; a determination unit that determines whether the amount of finishing material to be prepared calculated by the calculation unit is an appropriate amount based on the lower limit of the control; and a display unit that displays the amount of finishing material to be prepared and the determination result from the determination unit.

Description

Technical Field

[0001] The present invention relates to a printing pressure management system for a printing machine that has a plate cylinder to which a printing plate surface is attached and a blanket cylinder to which a finishing material is applied, and manages the printing pressure between the printing plate surface attached to the plate cylinder and the finishing material applied to the blanket cylinder when printing on a sheet.

Background Art

[0002] FIG. 8 is a diagram showing an example of a gravure printing mechanism (100) in a general gravure printing machine. The gravure printing mechanism (100) supplies the ink filled in the ink pot (11) to a gravure printing plate surface (not shown) attached to the plate cylinder (10) via an ink keying roller (12), wipes off the excess ink on the gravure printing plate surface with a wiping roller (13), and performs gravure printing by interposing and passing a sheet (base material) for printing between the contact surfaces of the plate cylinder (10) and the blanket cylinder (20).

[0003] In a rotary gravure printing machine, the plate cylinder (10) has a notch (10a) for attaching the printing plate surface, and the blanket cylinder (20) has a notch (20a) for attaching a finishing material (not shown) applied to the blanket cylinder (20). Further, in order to avoid the impact effect caused by the contact between the notch (10a) of the plate cylinder (10) and the notch (20a) of the blanket cylinder 20 during gravure printing, bearings (not shown) are provided at both ends of the plate cylinder (10) and the blanket cylinder (20). A bearing, also called a "cylinder pillow", is generally a metal support at both ends of a cylinder, and keeps the printing pressure constant by contacting the opposing cylinders with each other.

[0004] Figure 9 is a magnified view of the contact surface between the plate cylinder (10) and the impression cylinder (20) in an intaglio printing press. In order to achieve its characteristic rich tonal expression, an intaglio printing press has a mixture of deep and shallow lines on the intaglio plate surface (50) mounted on the plate cylinder (10). To ensure reliable ink transfer, it requires a higher printing pressure than a general-purpose offset lithographic printing press, and therefore requires appropriate printing pressure control by adjusting the amount (T1) of the padding material (40) applied to the impression cylinder (20). For example, if you want to increase the printing pressure, you can increase the amount (T1) of the padding material (40), which increases the contact amount (T2) between the intaglio plate surface (50) mounted on the plate cylinder (10) and the padding material (40) applied to the impression cylinder (20), resulting in stronger printing pressure. The contact amount (T2) referred to here is the amount of overlap between the intaglio plate surface (50) mounted on the plate cylinder (10) and the finishing material (40) applied to the impression cylinder (20).

[0005] The impression cylinder (20) is constructed using a combination of cushioning materials of varying thicknesses. When strong printing pressure is applied during printing, the impression cylinder (40) sinks, and the thickness of the impression cylinder (40) changes over time. As a result, it was difficult to guarantee the correct printing pressure over the long term.

[0006] Therefore, in order to address the deterioration of this binding material (40) over time, operators frequently sampled intaglio prints and visually inspected the quality of the intaglio prints. Operators managed the printing pressure by replacing the binding material (40) according to the quality of the intaglio prints. However, judging whether the printing pressure was appropriate based on the quality of the intaglio prints required many years of experience. If an inexperienced worker made an incorrect judgment, it could lead to a decrease in print quality, an increase in paper waste, and a decrease in machine utilization.

[0007] The replacement of the binding material (40), which is carried out as part of print pressure management, is performed periodically, mainly based on the number of days the machine is in operation and the number of sheets printed. However, the printing environment and printing conditions also have a significant impact. Therefore, judging the timing of replacement based solely on the number of days in operation and the number of sheets printed may not be appropriate. If the timing of replacing the binding material (40) is decided too early, it can lead to increased manufacturing costs due to excessive use of the binding material (40). Conversely, if the timing of replacing the binding material (40) is decided too late, it can lead to a decrease in print quality and an increase in the paper waste rate.

[0008] The applicant has proposed a printing press equipped with a detection device that measures the thickness of the finishing material (40) in real time in order to enable the finishing material (40) to be replaced at an appropriate time (see, for example, Patent Document 1). The printing press described in Patent Document 1 is configured to include at least one detection device from among a pressing force measuring device that measures the pressing force between opposing plate cylinders (10) and impression cylinders (20), a cylinder finishing measuring device that measures the thickness of the finishing material (40) on the impression cylinder (20), and a surface observation device that observes the surface of the finishing material. [Prior art documents] [Patent Documents]

[0009] [Patent Document 1] Japanese Patent Publication No. 2008-132603 [Overview of the Initiative] [Problems that the invention aims to solve]

[0010] However, Patent Document 1 involves attaching the sensor to the notch (10a) of the printing cylinder (10), which means that only the thickness of the finishing material (40) at the position opposite the sensor can be measured, and the thickness of the finishing material (40) in the area that is actually printed (corresponding to the printed surface) cannot be measured. Therefore, the actual quality state of the intaglio printing and the quality state of the intaglio printing estimated from the sensor measurements did not accurately match.

[0011] The present invention aims to provide a printing pressure management system for a printing press that can accurately measure the thickness of the finishing material (40) in the part that is actually being printed. [Means for solving the problem]

[0012] The present invention relates to a printing press for printing on a sheet, comprising a plate cylinder on which a printing plate is mounted and an impression cylinder on which a finishing material is applied, and is characterized by comprising: a measuring unit that measures the distance to the surface of the finishing material on the impression cylinder on which the finishing material is applied; a storage unit that stores at least a lower limit value for the amount of finishing material applied and the distance from the measuring unit to the surface of the impression cylinder on which the finishing material is not applied; a calculation unit that calculates the amount of finishing material applied from the difference between the distance from the measuring unit to the surface of the impression cylinder on which the finishing material is not applied and the distance to the surface of the finishing material measured by the measuring unit; a determination unit that determines the amount of finishing material calculated by the calculation unit based on the lower limit value; and a display unit that displays the determination result from the determination unit.

[0013] Furthermore, the present invention relates to a printing press for printing on a sheet, having a plate cylinder on which a printing plate is mounted and an impression cylinder on which a finishing material is applied, and is characterized by comprising: a measuring unit for measuring the distance to the surface of the finishing material; a storage unit that stores at least a lower limit value for the contact amount, the distance from the measuring unit to the surface of the impression cylinder on which no finishing material is applied, and a calculation formula (1) for determining the contact amount; a calculation unit that calculates the amount of finishing material applied from the difference between the distance from the measuring unit to the surface of the impression cylinder on which no finishing material is applied and the distance to the surface of the finishing material measured by the measuring unit, and calculates the contact amount from calculation formula (1); a determination unit that determines the contact amount calculated by the calculation unit based on the lower limit value; and a display unit that displays the determination result from the determination unit. Equation (1): Contact amount = Amount of finishing material + Sheet thickness + Amount of cylinder finishing + Amount of thermal expansion - Cylinder gap - Cylinder deflection

[0014] Further, the present invention is characterized in that, when it is determined in the determination unit that the amount of tailoring of the tailoring material is less than the management lower limit value, a control unit is provided that issues an instruction for adjusting the core distance between the plate cylinder and the impression cylinder.

[0015] Further, the present invention is characterized in that, when it is determined in the determination unit that the contact amount is less than the management lower limit value, a control unit is provided that issues an instruction for adjusting the core distance between the plate cylinder and the impression cylinder.

Effect of the Invention

[0016] According to the present invention, it becomes possible to accurately measure the thickness of the tailoring material of the actually printed part, which can contribute to the stabilization of the printing quality.

Brief Description of the Drawings

[0017] [Figure 1] It is a diagram showing a printing pressure management system of a printing machine of the present invention. [Figure 2] It is a diagram showing an example of the arrangement of the measuring unit of the present invention. [Figure 3] It is a flowchart showing the processing flow of the printing pressure management system of the printing machine in the first embodiment of the present invention. [Figure 4] It is a diagram showing the output image of the display unit in the first embodiment of the present invention. [Figure 5] It is a flowchart showing the processing flow of the printing pressure management system of the printing machine in the second embodiment of the present invention. [Figure 6] It is a diagram showing the output image of the display unit in the second embodiment of the present invention. [Figure 7] It is a diagram showing a state in which the display unit of the printing pressure management system of the printing machine of the present invention is displaying tailoring amount prediction information. [Figure 8] It is a diagram showing a gravure printing mechanism of a general gravure printing machine. [Figure 9] It is a diagram showing the contact surface between the plate cylinder (10) and the impression cylinder (20) in a gravure printing machine.

Modes for Carrying Out the Invention

[0018] Embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited to the embodiments described below, and various other embodiments can be implemented as long as they are within the scope of the technical idea described in the claims.

[0019] The printing machine to which the impression pressure management system in the present invention is applied is not particularly limited as long as it has a plate cylinder on which a plate surface is mounted and a blanket cylinder to which a finishing material is applied. For example, the impression pressure management system of the present invention can be applied to intaglio printing machines, letterpress printing machines, offset printing machines, etc. In the following description, an intaglio printing machine will be described as an example.

[0020] FIG. 1(a) is a diagram showing an impression pressure management system (1) of a printing machine in the present invention. The impression pressure management system (1) of the printing machine manages the impression pressure between the plate cylinder (10) and the blanket cylinder (20) in an intaglio printing machine having a plate cylinder (10) on which an intaglio plate surface (not shown) is mounted and a blanket cylinder (20) to which a finishing material (40) is applied. The configuration of the intaglio printing mechanism (100) in the intaglio printing machine is the same as the configuration shown in FIG. 8. Further, the intaglio printing mechanism (100) includes an inter-axis adjustment handle (not shown) for adjusting the center-to-center distance (S) between the plate cylinder (10) and the blanket cylinder (20).

[0021] The impression pressure management system (1) has at least a storage unit (31), a measurement unit (32), a calculation unit (33), a determination unit (34), and a display unit (36), and may further have a control unit (35).

[0022] Figures 1(b) and 1(c) are enlarged views illustrating the relationship between the impression cylinder (20), the shaping material (40), and the measuring section (32) shown in Figure 1(a). Figure 1(b) shows the state of the shaping material (40) before it is crushed by the printing pressure. The distance (l) shown in Figure 1(b) represents the distance (l) from the measuring section (32) to the surface of the shaping material (40), and the distance (m) represents the distance (m) from the measuring section (32) to the surface of the bare impression cylinder (20). Here, the bare impression cylinder (20) refers to the impression cylinder (20) without the shaping material (40) applied. The amount of shaping material (40) (n) can be determined by subtracting the distance (l) from the distance (m).

[0023] Figure 1(c) shows the state in which the finishing material (40) is crushed by the printing pressure during printing. Therefore, the amount of finishing material (n) of the finishing material (40) is a value that is crushed by the amount of crushing (x) from the amount of finishing material (n) shown in Figure 1(b) due to the printing pressure during printing. Also, the distance (l) from the measuring part (32) to the surface of the finishing material (40) is longer by the amount of crushing (x) than the distance (l) shown in Figure 1(b). The distance (m) shown in Figure 1(c) is the same as in Figure 1(b). In the following explanation, the upper limit of the finishing material (n) that results in a thickness that does not cause problems in print quality will be explained as the control upper limit, and the lower limit will be explained as the control lower limit. Note that in Figures 1(b) and 1(c), there is a gap between the impression cylinder (20) and the finishing material (40) for the sake of explanation, but in reality they are completely bonded together.

[0024] The memory unit (31) stores at least the lower limit of the amount (n) of the finishing material (40) applied to the impression cylinder (20), and the distance (m) from the measuring unit (32) to the surface of the impression cylinder (20) in its bare state. The memory unit (31) may also store the upper limit of the amount (n) of the finishing material (40).

[0025] As shown in Figure 1(c), the measuring unit (32) is positioned at a predetermined location on the impression cylinder (20) and measures the distance (l) from the measuring unit (32) to the surface of the finishing material (40) non-contact. More specifically, it measures the distance to the part of the surface of the finishing material (40) that actually contacts the sheet and presses against the printed surface of the sheet. More specifically, it measures the distance to the part that presses against the back surface of the printed surface of the sheet that contacts the area of ​​the printed pattern on the intaglio plate surface. An optical sensor, a radio wave sensor, or an ultrasonic sensor can be used for the measuring unit (32).

[0026] Figure 2 shows an example of the arrangement of the measuring unit (32) in this embodiment. In Figure 2, the measuring unit (32) is arranged on a bracket (22) that connects the frame (not shown) of the printing press. The arrangement of the measuring unit (32) is not limited as long as the distance to the finishing material (40) can be measured accurately, but in the following description, we will explain using the example in which the measuring unit (32) is arranged on the bracket (22).

[0027] Figure 2(a) shows an example in which a bracket (22) is provided with one measuring unit (32), and Figure 2(b) shows an example in which a bracket (22) is provided with multiple measuring units (32). Figure 2(c) shows an example in which the measuring unit (32) moves back and forth along the bracket (22). As shown in Figure 2(a), a single measuring unit (32) may be provided, but in order to grasp the amount (n) of finishing material (40) for the entire printed surface, it is preferable to provide multiple measuring units (32) as shown in Figure 2(b), or to allow the measuring unit (32) to move back and forth as shown in Figure 2(c).

[0028] Furthermore, as shown in Figures 2(a) to 2(c), it is preferable to have a bearer position measuring unit (37). The bearer position measuring unit (37) measures the distance from the bearer position measuring unit (37) to the bearer (21) to grasp the change in the position of the bearer (21). In this way, by grasping the change in the position of the bearer (21) using the bearer position measuring unit (37), it becomes possible to measure the mechanical zero point. In other words, even if the position of the impression cylinder (20) changes mechanically due to the effects of heat, etc., it is possible to prevent the amount of finishing material (40) to be prepared (n) from being considered to have changed. With this configuration, the measurement value by the measuring unit (32) can be corrected, and the accurate amount of finishing material (40) to be prepared (n) can be calculated.

[0029] Returning to Figure 1(a), the calculation unit (33) calculates the amount of finishing material (40) (n) by subtracting the distance (l) measured by the measurement unit (32) from the distance (m) from the measurement unit (32) to the surface of the bare impression cylinder (20) stored in the memory unit (31). For example, if the distance (m) from the measurement unit (32) to the surface of the bare impression cylinder (20) stored in the memory unit (31) is 400 mm and the distance (l) measured by the measurement unit (32) is 398.35 mm, the amount of finishing material (40) (n) will be 1.65 mm.

[0030] The determination unit (34) determines whether the tailoring amount (n) is appropriate based on the tailoring amount (n) calculated by the calculation unit (33) and the control limit of the tailoring amount (n). Furthermore, if the storage unit (31) also stores the control limit of the tailoring amount (n) of the tailoring material (40), it determines whether the tailoring amount (n) is appropriate based on the control limit and the control limit. Specifically, if the tailoring amount (n) calculated by the calculation unit (33) falls between the control limit and the control limit, it is determined that the tailoring amount (n) is appropriate; if it falls below the control limit or exceeds the control limit, it is determined that the tailoring amount (n) is not appropriate.

[0031] The display unit (36) displays the amount of workmanship (n) calculated by the calculation unit (34) and the judgment result from the judgment unit (34) in real time. The display format of the judgment result is not particularly limited and may include strings such as "OK," "Caution," and "NG," as well as reference information regarding printing pressure management, and instructions for replacing the workmanship material (40) described later. Furthermore, if the judgment result is "Caution" or "NG," it is desirable that the machine operator be notified by a buzzer, lamp, or the like.

[0032] The control unit (35) automatically adjusts the center distance between the plate cylinder (10) and the impression cylinder (20) using the center distance adjustment handle, according to the above determination result. In this case, it is desirable to store the center distance adjustment conditions in advance in the memory unit (31). The center distance adjustment conditions are, for example, the number of prints until printing is complete.

[0033] While adjusting the center spacing using the center spacing adjustment handle minimizes downtime, adjusting the center spacing (S) compromises the standard gap amount, which is fundamental to the intaglio printing press's settings. Printing with a gap narrower than the standard gap places a significant load on the bearings of the plate cylinder (10) and impression cylinder (20). Therefore, considering the mechanical impact on the intaglio printing press, it is desirable to avoid center spacing adjustments as much as possible. To minimize the impact on the intaglio printing press, it is advisable to store the center spacing adjustment conditions so that center spacing adjustments are performed only when the number of prints until completion is below a predetermined quantity, thus minimizing the impact on the intaglio printing press.

[0034] By including a control unit (35) in the printing pressure management system (1), even if the determination unit (34) determines that the binding material (40) has fallen below a management lower limit when the number of printed sheets until completion is less than a predetermined quantity, it is possible to ensure proper printing pressure by automatically adjusting the core spacing without replacing the binding material (40).

[0035] Figure 3 is a flowchart showing the processing flow of the printing pressure management system (1) of the printing press according to this embodiment.

[0036] When printing begins on the printing press (S51), the measuring unit (32) measures the distance (l) from the surface of the finishing material (40) applied to the impression cylinder (20) to the part that actually contacts the sheet and presses against the printing surface of the sheet (S52).

[0037] Next, the calculation unit (33) calculates the amount of finishing material (40) to be prepared (n) using the distance (m) from the measuring unit (32) to the surface of the bare impression cylinder (20), which is stored in the storage unit (31) beforehand, and the distance (l) measured in S52 (S53).

[0038] The amount of fabrication (n) calculated by the calculation unit (33) is displayed on the display unit (36) (S54).

[0039] Based on the finishing amount (n) calculated by the calculation unit (33) and the control limit of the finishing amount (n), the determination unit (34) determines whether the finishing amount (n) is an appropriate value, and whether it is close to the control limit. If it is close (No. in S55), the process returns to S52, where the measurement unit (32) measures the distance (l) from the surface of the finishing material (40) applied to the impression cylinder (20) to the part that actually contacts the sheet and presses against the printed surface of the sheet. Note that whether it is close to the control limit is predetermined using a predetermined value or predetermined ratio to the control limit. For example, if the control limit of the finishing amount (n) is 1.62 mm, it can be set to the control limit of the finishing amount (n) + 0.01 mm.

[0040] Figure 4 is an output image of the display unit (36) in S54. Figure 4(a) shows an example of displaying the finishing amount (n) calculated by the calculation unit (33), and in addition to the control lower limit, a control upper limit is also set. For example, the control lower limit can be set to 1.62 mm and the control upper limit to 1.67 mm. By setting a control upper limit in this way, abnormalities in the composition or installation of the finishing material (40) can be judged at an early stage. In other words, if the finishing material (40) is composed with the wrong thickness or number of pieces, or if the finishing material (40) is floating due to an installation abnormality, the finishing amount (n) will exceed the control upper limit, so the abnormality can be judged at an early stage before printing.

[0041] As shown in Figure 4, the display unit (36) displays the change in the amount of tailoring (n) over time, making it possible to predict in advance when to replace the tailoring material (40). Furthermore, as shown in Figure 4(a), it is preferable to display "OK" or similar if the calculated amount of tailoring (n) falls between the lower and upper limits of control.

[0042] In Figure 3, if the determination unit (34) determines that the amount of fabrication (n) calculated by the calculation unit (33) is close to the lower limit of control (Yes in S55), the display unit (36) displays a warning (S56). Figure 4(b) is an image of the output of the display unit (36) in S56. As shown in Figure 4(b), when the amount of fabrication (n) is close to the lower limit of control, a warning message such as "Caution" is displayed.

[0043] In Figure 3, if the amount of finishing material (n) calculated by the calculation unit (33) does not exceed the control limit (No in S57), the process returns to S52, and the measuring unit (32) measures the distance (l) from the surface of the finishing material (40) applied to the impression cylinder (20) to the part that actually contacts the sheet and presses against the printed surface of the sheet.

[0044] If the determination unit (34) determines that the tailoring quantity (n) calculated by the calculation unit (33) has fallen below the control limit (Yes in S57), the display unit (36) displays an instruction to replace the tailoring material (40) (S58). Figure 4(c) is an output image of the display unit (36) in S58. As shown in Figure 4(c), if the tailoring quantity (n) exceeds the control limit, it displays "NG" or similar to indicate that the tailoring quantity (n) is not appropriate.

[0045] Figure 5 is a flowchart showing the processing flow of the printing pressure management system (1) of a printing press with a core spacing adjustment function. Note that the same processing as described in the flowchart in Figure 3 will not be explained. In S57 of Figure 5, if it is determined that the set amount (n) calculated by the calculation unit (33) is below the control limit (Yes in S57), it is determined whether or not the core spacing adjustment conditions are met (S59).

[0046] If the number of printed sheets remaining until completion is less than or equal to a predetermined quantity (Yes in S59), even if the determination unit (34) determines that the amount (n) of the binding material (40) is not appropriate (below the control lower limit) (Yes in S57), the core spacing adjustment is performed (S60) without replacing the binding material (40). If it is determined that the core spacing adjustment conditions are not met (No in S59), an instruction to replace the binding material (40) is displayed (S58).

[0047] Figure 6 shows an output image of the display unit (36) which allows the user to select whether or not to perform center-space adjustment when the center-space adjustment conditions are met. That is, in Figure 5, when it is determined that the settling amount (n) calculated by the calculation unit (33) is below the control limit (Yes in S57), permission to adjust the center-space is requested from the machine operator, as shown in Figure 6(a). When the machine operator gives permission to adjust the center-space, the center-space adjustment is performed (S60), as shown in Figure 6(b). In Figure 6(b), the "Center-space" display lights up when the machine operator gives permission to adjust the center-space, indicating that the center-space adjustment is being performed automatically. The amount of center-space adjustment may be stored in advance in the storage unit (31), or it may be set by the machine operator when they give permission to adjust the center-space, as shown in Figure 6.

[0048] In this way, when the determination unit (34) determines that the amount (n) of the finishing material (40) is not appropriate, the center distance between the plate cylinder (10) and the impression cylinder (20) is adjusted, provided that the center distance adjustment conditions are met. This allows the center distance adjustment to be kept short and to the minimum necessary adjustment. Furthermore, it is preferable that the system has a function to automatically return the center distance (S) to its original position after the finishing material has been replaced. With this configuration, the standard gap amount is ensured, the load on the printing press is reduced, and the lifespan of the printing press can be extended.

[0049] Figure 7 is an output image diagram showing an example of displaying the production quantity prediction information on the display unit (36). As shown in Figure 7, it is preferable that the display unit (36) predicts and displays the trend of the production quantity (n) using machine learning based on past data (dotted line), and by displaying the production quantity prediction information, the printing press can be maintained systematically (replacement of finishing materials).

[0050] Up to this point, the description has focused on managing the printing pressure using the amount (n) of the preparation material (40). However, the printing pressure management system (1) may also manage the printing pressure using the amount of contact between the intaglio plate surface (50) mounted on the plate cylinder (10) and the preparation material (40) applied to the impression cylinder (20), instead of the amount (n) of the preparation material (40). In this case, the memory unit (31) stores a calculation formula (Equation 1) for determining the contact amount, along with the sheet thickness, the preparation amount of the plate cylinder (10), the thermal expansion amount of the impression cylinder (20), the gap between the plate cylinder (10) and the impression cylinder (20), and the deflection amount of the impression cylinder (20) as conditional values ​​for determining the contact amount. Furthermore, the memory unit (31) may also store an upper limit for the control of the contact amount in addition to the lower limit. In the following description, the system will be described in a form where the lower limit and upper limit for the control of the contact amount are stored.

[0051] The calculation unit (33) calculates the contact amount using formula (Equation 1) based on the condition values ​​for determining the amount (n) and contact amount of the tailoring material (40). The determination unit (34) determines whether the contact amount is appropriate based on the calculated contact amount and the control lower limit and control upper limit of the contact amount. The display unit (36) can display the contact amount in real time instead of the amount (n) of the tailoring material (40). The contact amount can be obtained by calculating using the following formula (Equation 1).

[0052] (Formula 1) Contact amount = Amount of material to be prepared + Sheet thickness + Amount of cylinder to be prepared + Amount of thermal expansion - Cylinder gap - Cylinder deflection

[0053] In the above calculation formula (Formula 1), the "amount of material to be prepared" is a real-time measured value and therefore constantly fluctuates during printing. "Sheet thickness" refers to the thickness of the sheet (substrate) that is transported and printed on by the printing press. "Amount of plate cylinder to be prepared" refers to the amount of the intaglio plate surface attached to the plate cylinder (10). "Amount of thermal expansion" refers to the amount of expansion of the plate cylinder (10) when it is heated from room temperature before printing to a printable temperature. "Cylinder gap" refers to the gap between the plate cylinder (10) and the impression cylinder (20) in their bare state (without plate surface or preparation material attached) and in the state when they are attached during printing. The "contact state" is the state in which the plate cylinder (10) and the impression cylinder (20) are closest to each other. During printing, printing takes place with the plate cylinder (10) and impression cylinder (20) in the contact state, and when the machine is stopped, the plate cylinder (10) and impression cylinder (20) are in the detached state. "Cylinder deflection amount" refers to the amount of deflection of the impression cylinder (20) during printing.

[0054] In the case of printing presses that print the same product, it is preferable to unify the lower and upper limits of the contact amount across all machines. For example, the lower limit can be set to 0.43 mm and the upper limit to 0.48 mm. In the above calculation formula (Equation 1), the condition values ​​for determining the contact amount other than the finishing amount (n) of the finishing material (40) calculated by the calculation unit (33) are set as values ​​specific to the printing press. Therefore, even if the printing pressure is controlled using the contact amount, the same effect as controlling the printing pressure using the finishing amount (n) of the finishing material (40) can be obtained.

[0055] As an example of the conditions for determining the contact amount, if the sheet thickness is 0.1 mm, the cylinder height is 1.0 mm, the thermal expansion is 0.23 mm, the cylinder gap is 2.42 mm, and the cylinder deflection is 0.1 mm, and the cylinder height (n) of the mounting material (40) calculated by the calculation unit (33) is 1.65 mm, then applying this to the above calculation formula (Equation 1), the contact amount becomes 0.46 mm, which falls between the upper and lower limits of control, and can therefore be said to be an appropriate contact amount.

[0056] The conditional values ​​for determining the above contact amount are set in advance as values ​​specific to the printing press. However, the sheet thickness and thermal expansion amount may also be measured using actual values ​​taken during printing, similar to the amount of finishing material (40) (n), and the contact amount may be calculated from these measured values.

[0057] The processing flow of the printing press pressure management system (1) and the display format of the display unit (36) shown in Figures 3 to 7 are the same as those for pressure management using the amount (n) of the finishing material (40), so a detailed explanation is omitted. The difference is that, based on the above calculation formula (Equation 1), the calculation unit (33) calculates the contact amount from the amount (n) of the finishing material (40) and the condition value for determining the contact amount. The determination unit (34) then determines whether the printing pressure is appropriate based on the calculated contact amount and the upper and lower management limits of the contact amount that are stored in advance in the memory unit (31). The only difference is that the display unit (36) displays the contact amount instead of the amount (n) of the finishing material (40).

[0058] Although the present invention has been described in detail above, various modifications can be made to the above configuration without departing from the scope of the invention. Therefore, all matters included in the above description or shown in the accompanying drawings should be construed as illustrative. [Explanation of Symbols]

[0059] 1. Print pressure management system 10-inch cylinder 10a, 20a Notches 11 Inkwell 12 Ink Transfer Roller 13 Wiping roller 20 Impression drum 21 Bearer 22 brackets 31 Storage section 32 Measuring part 33 Arithmetic section 34 Judgment section 35 Control Unit 36 Display section 37 Bearer position measurement unit 40 tailoring materials 50 Intaglio plate 100 Intaglio printing mechanism S Center distance

Claims

1. A printing press having a plate cylinder on which a printing plate is mounted and an impression cylinder for applying finishing material, and for printing on a sheet, wherein the printing pressure management system of the printing press uses the amount of finishing material applied, A measuring unit for measuring the distance to the surface of the finishing material in the impression cylinder to which the finishing material has been applied, A storage unit that stores at least the minimum control value of the amount of finishing material to be prepared and the distance from the measuring unit to the surface of the impression cylinder where the finishing material has not been applied, A calculation unit calculates the amount of finishing material to be applied from the difference between the distance from the measuring unit to the surface of the impression cylinder where the finishing material has not been applied and the distance to the surface of the finishing material measured by the measuring unit. A determination unit determines whether the amount of tailoring material is appropriate based on the amount of tailoring material calculated by the calculation unit and the control lower limit value. A printing pressure management system for a printing press, characterized by comprising a display unit that displays the determination result from the determination unit.

2. A printing press having a plate cylinder on which a printing plate is mounted and an impression cylinder for applying finishing material, and for printing on a sheet, wherein the printing pressure management system of the printing press uses the amount of contact between the printing plate and the finishing material, A measuring unit for measuring the distance to the surface of the aforementioned finishing material, A storage unit that stores at least the lower limit of the contact amount, the distance from the measuring unit to the surface of the impression cylinder where the finishing material is not applied, and a calculation formula (1) for determining the contact amount. A calculation unit calculates the amount of finishing material applied from the difference between the distance from the measuring unit to the surface of the impression cylinder where the finishing material has not been applied and the distance to the surface of the finishing material measured by the measuring unit, and calculates the contact amount from the calculation formula (1), A determination unit determines whether the contact amount is appropriate based on the contact amount calculated by the calculation unit and the control lower limit value. A printing press pressure management system characterized by comprising a display unit that displays the determination result from the determination unit. Equation (1): Contact amount = Amount of finishing material + Sheet thickness + Amount of cylinder finishing + Amount of thermal expansion - Cylinder gap - Cylinder deflection

3. The printing pressure management system for a printing press according to claim 1, characterized in that the determination unit provides a control unit that issues an instruction to adjust the center distance between the plate cylinder and the impression cylinder when it determines that the amount of finishing material has fallen below the control lower limit.

4. The printing pressure management system for a printing press according to claim 2, characterized in that the determination unit provides a control unit that issues an instruction to adjust the center distance between the plate cylinder and the impression cylinder when it determines that the contact amount has fallen below the control lower limit.

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