JP5736797B2 - Printing machine diagnostic apparatus, printing machine diagnostic program, and printing machine diagnostic method - Google Patents

Description

  The present invention relates to a technical field such as a printing press diagnostic apparatus that identifies a cause of a malfunction of a printing press.

  First, an offset printing machine will be described with reference to FIGS. The offset printing machine is provided with printing units U for printing colors (for example, when the printing colors are four colors of CMYK). As shown in FIG. 1, the printing unit U includes an ink key type ink supply device including an ink key 1100, an ink base roller 1200, an ink fountain 1300 for storing ink, a chip 1500, and the like. The ink key 1100 is a blade-like member, and a plurality (eight in FIG. 2) are juxtaposed in the printing width direction as shown in FIG. Each ink key 1100 is displaced in the direction of arrow 1110 according to the up and down movement of the chip 1500. Along with this, the gap amount (ink key opening 1400) of the ink key 1100 with respect to the ink base roller 1200 is displaced. As a result, the ink supply amount can be adjusted for each ink key 1100 (that is, the region where ink is supplied by the ink key). Further, the amount of ink supplied to the entire pattern can be adjusted by changing the rotation speed of the ink source roller 1200. In this way, in the printing unit U, the ink supply amount can be adjusted by controlling the ink key opening 1400 or the rotation speed of the ink base roller 1200. The ink supplied from the ink supply device is transferred to paper as a pattern through a plate cylinder and a blanket cylinder to become a printed matter. Since the light absorptance varies depending on the thickness (film thickness) of the ink attached (stacked) on the paper, the color tone of the printed matter varies. Therefore, the color tone of the printed matter can be adjusted by controlling the ink supply amount (that is, the ink key opening 1400 and the rotation speed of the ink base roller 1200).

  The adjustment of the ink key opening 1400 is performed by the operator of the printing press changing the ink key opening setting value from the operator terminal. A reference ink key opening 1400 (referred to as zero point) is set for each printing machine, and when the ink key opening 1400 is wider than the zero point, a value of “+ (plus)” is set as the ink key opening setting value. On the other hand, when narrowing, a value of “− (minus)” may be set.

  In the offset printing machine, when printing a desired printed matter, printing for color matching called trial printing is performed before performing the main printing. The trial printing is performed until the operator obtains a desired color tone while comparing the printed material with the color sample. Since the printed matter during the trial printing is discarded as waste paper, it is desirable to reduce the amount of the trial printing as much as possible in order to reduce the waste of the printing paper.

  Under such circumstances, as a technique for reducing the trial printing, the difference between the preset value that is the ink key opening setting value at the start of the trial printing and the OK value that is the ink key opening setting value when the desired color tone is obtained. Many techniques aimed at reducing the size have been disclosed. Specifically, for example, the area ratio (picture area ratio) occupied by each print color of CMYK is calculated for each ink key (specifically, for each area where ink is supplied by the ink key), and the calculated pattern area ratio is calculated. In general, a technique for experimentally determining the relationship between the ink key opening setting value for obtaining the reference density of the pattern and determining the preset value according to the pattern area ratio is known.

  In addition, Patent Document 1 refers to an ink key opening characteristic line that indicates a correspondence relationship between a pattern area ratio and an ink key opening setting value, and an ink key preset that individually presets an ink key opening setting value based on the pattern area ratio. An ink key preset device is disclosed that records an actual OK value for each ink key a predetermined number of times and creates a new ink key opening characteristic line based on the recorded OK value.

  However, these techniques are based on the premise that the printing unit U operates in a normal state. For example, (1) when the zero point of the ink key 1100 is displaced, (2) the ink is fixed between the adjacent ink keys 1100 (for example, the portion indicated by B in FIG. 2), and the ink key 1100 malfunctions. (3) If the ink key opening 1400 differs between the ink keys 1100 even if the same ink key opening setting value is set due to mechanical factors (backlash of the mechanism or gear, ink sticking, etc.), (4) When the axes of the ink base roller 1200 and the ink calling roller 1210 (see FIG. 2) are deviated, the ink key 1100 does not operate according to the set value, and the trial printing by adjustment increases. For this reason, when a problem occurs in the printing unit U, it is necessary to immediately identify the cause of the problem and perform appropriate maintenance.

  On the other hand, Patent Document 2 discloses a technique for recording a ratio between the pattern area ratio and the ink key opening degree data as an evaluation index, comparing the past and current indices, and giving a warning when a defect occurs in the ink key. It is disclosed. In Patent Document 3, color management data characterizing the characteristics of a printed material is stored in a color management database, the amount of change in the color management data after a predetermined period of time is compared with a diagnostic condition, and printing is performed based on the comparison result. A technique for diagnosing the state of a machine is disclosed.

Japanese Patent No. 4395287 JP 2004-188959 A JP 2004-195740 A

  However, in the above-described technique, the cause of the failure cannot be specified, so that it may take a long time for maintenance. The present invention has been made in view of such problems, and it is an object of the present invention to provide a printing press diagnostic apparatus and the like that can shorten the maintenance time by specifying the cause of the malfunction of the printing press.

In order to solve the above problems, the invention according to claim 1 is a printing press diagnostic apparatus for diagnosing a printing press having a plurality of ink keys, and acquires a preset value of an ink key opening set value for each ink key. Preset value acquiring means, an OK value acquiring means for acquiring an ink key opening setting value that is an ink key opening setting value when a predetermined print quality is obtained for each ink key, and the preset value acquiring means Difference value recording means for recording difference value information indicating a difference value between the acquired preset value and the OK ink key opening setting value acquired by the OK value acquisition means in the difference value storage means; and the difference value storage means based on the difference value indicated by the stored difference value information, and a diagnostic means for identifying a fault cause of the printing press, the diagnostic means, for each of the ink keys, before An average value of difference values is calculated based on the difference value information for the most recent predetermined number stored in the difference value storage means, and the average value is calculated when the calculated average values are arranged in the order of arrangement of the ink keys in the printing press. When the inclination of the straight line obtained from the set of the above is larger than the inclination warning determination value, it is specified as the cause of the malfunction that the ink source roller is misaligned .

According to the first aspect of the present invention, the cause of the malfunction of the printing press is specified based on the difference value between the preset value and the OK ink key opening setting value. In other words, the cause of the malfunction of the printing press can be identified based on the amount of displacement of the ink key opening setting value by the operator (ink key opening operation amount), which shows a certain tendency when there is a malfunction in the printing press. As a result, maintenance time can be shortened.
In addition, when the average value of the difference values calculated for each ink key that appears when the ink source roller is misaligned is arranged in the order of the ink key arrangement in the printing press, the slope of the straight line obtained from the set of the average values It is possible to diagnose whether or not the axis deviation of the ink source roller has occurred based on the tendency that is larger than the inclination warning determination value.

The invention according to claim 2 is a printing press diagnostic apparatus for diagnosing a printing press including a plurality of ink keys, and preset value acquisition means for acquiring a preset value of an ink key opening setting value for each ink key; For each ink key, an OK value acquisition means for acquiring an OK ink key opening setting value, which is an ink key opening setting value when a predetermined print quality is obtained, and a preset value acquired by the preset value acquisition means; The difference value recording means for recording the difference value information indicating the difference value with the OK ink key opening setting value acquired by the OK value acquisition means in the difference value storage means, and the difference value stored in the difference value storage means Diagnostic means for identifying the cause of the malfunction of the printing press based on the difference value indicated by the information, and the diagnostic means records the difference value storage means for each ink key. A standard deviation and an average value of the difference values are calculated based on the difference value information for the most recent predetermined number of cases, and the number of ink keys whose standard deviation is less than or equal to the zero point deviation amount judgment value is greater than or equal to the zero point deviation warning judgment value. In addition, when the number of ink keys whose absolute value of the average value is equal to or greater than the zero-point defect determination value is equal to or greater than the zero-point defect warning determination value, the fact that the zero point of the ink key is shifted is specified as the cause of the defect. It is characterized by.

According to the second aspect of the invention, the cause of the malfunction of the printing press is specified based on the difference value between the preset value and the OK ink key opening setting value. In other words, the cause of the malfunction of the printing press can be identified based on the amount of displacement of the ink key opening setting value by the operator (ink key opening operation amount), which shows a certain tendency when there is a malfunction in the printing press. As a result, maintenance time can be shortened.
Also, an ink key that appears when the zero point of the ink key is shifted and the standard deviation of the difference value is less than or equal to the zero shift amount judgment value is greater than or equal to the zero shift warning judgment value, and the average value of the difference values is greater than or equal to the zero defect judgment value It is possible to diagnose whether or not there is a deviation in the zero point of the ink key based on the tendency that the ink key is equal to or greater than the zero point failure warning judgment value.

The invention according to claim 3 is the printing press diagnostic apparatus according to claim 1 or 2, wherein when the cause of the failure is specified by the diagnostic means, the cause of the failure is presented and a warning is given. A warning means is further provided .

According to the third aspect of the present invention, when the cause of the failure is specified , the cause of the failure is presented / warned. Therefore, the operator can easily specify the cause of the failure and immediately start the maintenance work. be able to.

According to a fourth aspect of the present invention, a computer included in a printing press diagnostic apparatus for diagnosing a printing press having a plurality of ink keys acquires a preset value for acquiring a preset value of an ink key opening setting value for each ink key. Means, an OK value acquisition means for acquiring an OK ink key opening setting value, which is an ink key opening setting value when a predetermined print quality is obtained, and a preset value acquired by the preset value acquisition means; , Difference value recording means for recording difference value information indicating a difference value with the OK ink key opening setting value acquired by the OK value acquisition means in the difference value storage means, and difference value information stored in the difference value storage means On the basis of the difference value indicated by the printer, the diagnostic means for identifying the cause of the malfunction of the printing press, the diagnostic means for each ink key, the difference An average value of difference values is calculated based on the difference value information for the most recent predetermined number stored in the value storage means, and when the calculated average values are arranged in the order of arrangement of the ink keys in the printing press, When the inclination of the straight line obtained from the set is larger than the inclination warning determination value, the fact that the axis deviation of the ink source roller has occurred is specified as the cause of the malfunction .

According to the invention described in claim 4, the cause of the malfunction of the printing press is specified based on the difference value between the preset value and the OK ink key opening setting value. In other words, the cause of the malfunction of the printing press can be identified based on the amount of displacement of the ink key opening setting value by the operator (ink key opening operation amount), which shows a certain tendency when there is a malfunction in the printing press. As a result, maintenance time can be shortened.
In addition, when the average value of the difference values calculated for each ink key that appears when the ink source roller is misaligned is arranged in the order of the ink key arrangement in the printing press, the slope of the straight line obtained from the set of the average values It is possible to diagnose whether or not the axis deviation of the ink source roller has occurred based on the tendency that is larger than the inclination warning determination value.

According to a fifth aspect of the present invention, a computer included in a printing press diagnostic apparatus for diagnosing a printing press having a plurality of ink keys is used to acquire a preset value for acquiring a preset value of an ink key opening setting value for each ink key. Means, an OK value acquisition means for acquiring an OK ink key opening setting value, which is an ink key opening setting value when a predetermined print quality is obtained, and a preset value acquired by the preset value acquisition means; , Difference value recording means for recording difference value information indicating a difference value with the OK ink key opening setting value acquired by the OK value acquisition means in the difference value storage means, and difference value information stored in the difference value storage means On the basis of the difference value indicated by the printer, the diagnostic means for identifying the cause of the malfunction of the printing press, the diagnostic means for each ink key, the difference A standard deviation and an average value of the difference values are calculated based on the difference value information for the most recent predetermined number stored in the value storage means, and the number of ink keys whose standard deviation is equal to or less than the zero point deviation amount judgment value If the number of ink keys that are equal to or greater than the determination value and the absolute value of the average value is equal to or greater than the zero-point defect determination value is equal to or greater than the zero-point defect warning determination value, the zero point of the ink key is shifted. It is characterized by specifying as a cause .

According to the invention described in claim 5, the cause of the malfunction of the printing press is specified based on the difference value between the preset value and the OK ink key opening setting value. In other words, the cause of the malfunction of the printing press can be identified based on the amount of displacement of the ink key opening setting value by the operator (ink key opening operation amount), which shows a certain tendency when there is a malfunction in the printing press. As a result, maintenance time can be shortened.
Also, an ink key that appears when the zero point of the ink key is shifted and the standard deviation of the difference value is less than or equal to the zero shift amount judgment value is greater than or equal to the zero shift warning judgment value, and the average value of the difference values is greater than or equal to the zero defect judgment value It is possible to diagnose whether or not there is a deviation in the zero point of the ink key based on the tendency that the ink key is equal to or greater than the zero point failure warning judgment value.

The invention according to claim 6 is a printing press diagnostic method executed by a printing press diagnostic apparatus for diagnosing a printing press having a plurality of ink keys, and a preset value of an ink key opening setting value for each ink key. Acquiring an OK ink key opening setting value that is an ink key opening setting value when a predetermined print quality is obtained for each ink key, the acquired preset value, and the acquisition The difference value information indicating a difference value from the set value of the OK ink key opening is recorded in the difference value storage means, and the printing is performed based on the difference value indicated by the difference value information stored in the difference value storage means. Identifying the cause of malfunction of the machine, and identifying the cause of malfunction in the step of identifying the cause of malfunction is the latest predetermined item stored in the difference value storage means for each ink key. The average value of the difference values is calculated based on the difference value information of the minute, and when the calculated average values are arranged in the order of the ink key arrangement in the printing press, the slope of the straight line obtained from the set of the average values is an inclination warning. If it is larger than the judgment value, the fact that the axis deviation of the ink source roller has occurred is identified as the cause of the malfunction.
According to the invention described in claim 6, the cause of the malfunction of the printing press is specified based on the difference value between the preset value and the OK ink key opening setting value. In other words, the cause of the malfunction of the printing press can be identified based on the amount of displacement of the ink key opening setting value by the operator (ink key opening operation amount), which shows a certain tendency when there is a malfunction in the printing press. As a result, maintenance time can be shortened.
In addition, when the average value of the difference values calculated for each ink key that appears when the ink source roller is misaligned is arranged in the order of the ink key arrangement in the printing press, the slope of the straight line obtained from the set of the average values It is possible to diagnose whether or not the axis deviation of the ink source roller has occurred based on the tendency that is larger than the inclination warning determination value.

The invention according to claim 7 is a printing press diagnostic method executed by a printing press diagnostic apparatus for diagnosing a printing press having a plurality of ink keys, wherein each ink key has a preset value of an ink key opening setting value. Acquiring an OK ink key opening setting value that is an ink key opening setting value when a predetermined print quality is obtained for each ink key, the acquired preset value, and the acquisition The difference value information indicating a difference value from the set value of the OK ink key opening is recorded in the difference value storage means, and the printing is performed based on the difference value indicated by the difference value information stored in the difference value storage means. Identifying the cause of malfunction of the machine, and identifying the cause of malfunction in the step of identifying the cause of malfunction is the latest predetermined item stored in the difference value storage means for each ink key. A standard deviation and an average value of the difference value are calculated based on the difference value information of the minute, the number of ink keys whose standard deviation is equal to or less than the zero shift amount determination value is equal to or greater than the zero shift warning determination value, and When the number of ink keys whose absolute value of the average value is equal to or greater than the zero-point defect determination value is equal to or greater than the zero-point defect warning determination value, the fact that the zero point of the ink key is shifted is specified as the cause of the defect .
According to the seventh aspect of the invention, the cause of the malfunction of the printing press is specified based on the difference value between the preset value and the OK ink key opening setting value. In other words, the cause of the malfunction of the printing press can be identified based on the amount of displacement of the ink key opening setting value by the operator (ink key opening operation amount), which shows a certain tendency when there is a malfunction in the printing press. As a result, maintenance time can be shortened.
Also, an ink key that appears when the zero point of the ink key is shifted and the standard deviation of the difference value is less than or equal to the zero shift amount judgment value is greater than or equal to the zero shift warning judgment value, and the average value of the difference values is greater than or equal to the zero defect judgment value It is possible to diagnose whether or not there is a deviation in the zero point of the ink key based on the tendency that the ink key is equal to or greater than the zero point failure warning judgment value.

  According to the present invention, the cause of the malfunction of the printing press is specified based on the difference value between the preset value and the OK ink key opening setting value. In other words, the cause of the malfunction of the printing press can be identified based on the amount of displacement of the ink key opening setting value by the operator (ink key opening operation amount), which shows a certain tendency when there is a malfunction in the printing press. As a result, maintenance time can be shortened.

1 is a schematic diagram of a printing unit in an offset printing machine. It is the schematic for demonstrating the positional relationship of a some ink key and an ink origin roller. It is a figure which shows schematic structure of an offset rotary printing system. It is a block diagram which shows the schematic structure of an operator terminal. It is a figure which shows an example of ink key opening degree characteristic data. It is a figure which shows an example at the time of dividing | segmenting an image according to an ink key. It is a figure which shows an example of setting log | history data. It is an example for demonstrating a mode that the axis deviation of the ink origin roller has arisen. FIG. 6 is an example of a graph showing a standard deviation and an average value of ink key opening operation amounts when an ink source roller is misaligned. FIG. It is an example of the graph which showed the standard deviation and the average value of the ink key opening operation amount when the zero point of the ink key is shifted in the opening direction. It is an example of the graph which showed the standard deviation and average value of the ink key opening operation amount when some ink keys have caused malfunction. It is a figure which shows an example of a malfunction cause specific table. It is a flowchart which shows an example of the process at the time of the printing by the control part of an operator terminal. (A) It is an example of the warning message at the time of the axis deviation of an ink origin roller. (B) It is an example of the warning message at the time of the zero point shift | offset | difference of an ink key. (C) It is an example of the warning message at the time of malfunction of an ink key.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The embodiment described below is an embodiment when the present invention is applied to the rotary offset printing system S. In this embodiment, the printing unit included in the printing press included in the offset rotary printing system S has the same configuration as the printing unit U described with reference to FIG. This will be described using reference numerals.

  FIG. 3 is a diagram showing a schematic configuration of the offset rotary printing system S according to the embodiment of the present invention. The offset rotary printing system S includes a printing press P and an operator terminal 1.

  The printing press P is a multi-color printing press, and printing units U1 to U4 are provided for each ink color (C (cyan), M (magenta), Y (yellow), K (black)). Basically, the printing unit U1 corresponds to K, the printing unit U2 corresponds to C, the printing unit U3 corresponds to M, and the printing unit U4 corresponds to Y. Depending on the pattern or color to be printed, the color assigned to each printing unit U May be different.

  As described above with reference to FIG. 1, each printing unit U includes an ink key type ink supply device including a plurality of ink keys 1100, an ink source roller 1200, and the like. Each ink key 1100 of each printing unit U is assigned a key NO, and the ink keys 1100 having the same key NO print the same area on the paper. Further, since the printing press P according to the present embodiment is a double-sided printing press, each printing unit U is provided with a pair of blanket cylinders (upper cylinder, lower cylinder) so as to sandwich the paper transport path, and each blanket cylinder. On the other hand, a plate cylinder (upper cylinder, lower cylinder) and an ink supply device (upper cylinder side, lower cylinder side) are provided.

  The operator terminal 1 generates printing press control information for controlling the printing press P based on an input operation or the like by the operator, and transmits the printing press control information to the printing press P. The printing press control information includes ink key opening control information indicating the ink key opening setting value for controlling the opening (that is, ink supply amount) of the ink key 1100 of each printing unit U, and the rotation speed of the ink base roller. Rotational speed control information indicating a rotational speed setting value for control, and pulling ratio control information indicating a pulling ratio setting value for controlling a pulling ratio (indicating a degree of pulling on the paper during paper conveyance) are included.

  For each ink key 1100 in each printing unit U, the operator terminal 1 specifies a preset value based on ink key opening characteristic data that defines an ink key opening setting value (preset value) according to the pattern area ratio. Further, in the case where a malfunction occurs in the printing press P, from the viewpoint that a certain tendency appears in the amount of displacement of the ink key opening setting value (ink key opening operation amount) by the operator, The operator terminal 1 analyzes the ink key opening operation amount for each ink key 1100 and specifies the cause of the malfunction.

  Next, the structure and function of each part constituting the operator terminal 1 according to the present embodiment will be described with reference to FIG.

  FIG. 4 is a block diagram showing a schematic configuration of the operator terminal 1 of the present invention. As shown in FIG. 4, the operator terminal 1 includes a control unit 11, a storage unit 12, a display unit 13, an operation unit 14, and a communication unit 15 for performing communication with the printing press P. The control unit 11, the storage unit 12, the display unit 13, the operation unit 14, and the communication unit 15 are connected to each other via a bus.

  The control unit 11 includes a CPU (Central Processing Unit) 11a having a calculation function, a ROM (Read Only Memory) 11b, a working RAM (Random Access Memory) 11c, an oscillation circuit (not shown), and the like. Based on the operation signal from the operation unit 14, information for controlling each of the constituent members is generated to realize the operation corresponding to the operation information included in the operation signal, and the information is transmitted via the bus. It outputs to a corresponding structural member and controls the operation of each structural member.

  The control unit 11 also functions as a preset value acquisition unit, an OK value acquisition unit, a difference value recording unit, a diagnosis unit, and a warning unit according to the present invention by executing various control programs stored in the storage unit 12 or the like. .

  The storage unit 12 stores ink key opening characteristic data 121, setting history data 122, a failure cause specifying table 123, various setting information, and the like. The storage unit 12 is an example of a difference value storage unit of the present invention.

  Further, the storage unit 12 stores various control programs including the printing press diagnostic program of the present invention, data, and the like. For example, the various programs may be acquired from another server device or the like via a network, or may be recorded on a recording medium and read via a drive device. That is, the printing press diagnostic program of the present invention stored in the storage unit 12 can be transmitted via a network, or can be recorded on a computer-readable recording medium and transferred.

  The display unit 13 is configured by a liquid crystal display or the like, and displays plate making data, various screens such as an operation screen and a setting screen. On the setting screen, the operator sets the ink key opening setting value, the ink original roller rotation speed setting value, the draw rate setting value, paper information (for example, information on paper such as paper type, paper width, and weight), Ink information (for example, information on ink, such as the type of ink), a set value of the drying temperature, and the like can be set. The control unit 11 stores various information set on the setting screen in the storage unit 12 and transmits a part of the information to the printing press P as control information. The plate making data can be output by a printer connected to the operator terminal 1.

  Next, the ink key opening degree characteristic data 121 will be described with reference to FIGS. As shown in FIG. 5, the ink key opening characteristic data 121 is data for specifying an ink key opening setting value (preset value) corresponding to the pattern area ratio. In the present embodiment, the storage unit is stored for each paper type. 12 is stored. The reason why the ink key opening characteristic data 121 is stored for each paper type is that the ink penetration rate differs depending on the paper type, and the color tone is different even when printing is performed with the same amount of ink. Since the color tone may vary depending on the type of ink, the ink key opening characteristic data 121 may be set for each type of ink.

  As shown in FIG. 6, the pattern area ratio is a value calculated for each of the divided areas 200 a to 200 h obtained by dividing the plate-making data 200 in the printing width direction (roller axial direction). The divided areas 200a to 200h are set corresponding to each ink key 1100 (FIG. 6 is an example in the case where eight ink keys are provided in each printing unit U). The pattern area ratio is the ratio of the area (pattern area) to which the target color is added in each of the divided areas 200a to 200h. For example, in the case of the ink key 1100 in the printing unit U corresponding to C (cyan), the target color is C (cyan). The pattern area ratio is calculated by multiplying the number of divided areas by 4 (four colors of C, M, Y, K) (8 areas × 4 colors = 32 in the example of FIG. 6). In addition, the calculation method of a pattern area ratio can use a well-known calculation method, For example, the calculation method which the control part 11 calculates by operation from digital plate-making data is employable. In addition, in the initial state (at the time of shipment) of the operator terminal 1, ink key opening degree characteristic data 121 obtained experimentally is recorded.

  The control unit 11 selects the ink key opening degree characteristic data 121 corresponding to the paper type set from the setting screen from the plurality of ink key opening degree characteristic data 121 stored in the storage unit 12 and opens the selected ink key opening degree. The preset value of each ink key 1100 is acquired based on the degree characteristic data 121 and the pattern area ratio calculated for each of the divided areas 200a to 200h.

  Next, the setting history data 122 will be described with reference to FIG. First, the flow until the setting history data 122 is recorded in the storage unit 12 will be described. In the trial printing, when the desired color tone cannot be obtained with the preset value, the operator changes the ink key opening setting value from the operator terminal 1 to adjust the color tone. When the desired color tone is obtained (referred to as “OK”), the operator performs a predetermined OK operation (for example, an operation of clicking the OK button on the operation screen). When the control unit 11 detects the OK operation, the control unit 11 stores the setting history data 122 in the storage unit 12.

  As shown in FIG. 7, the setting history data 122 includes condition information and ink key information. The condition information includes the setting value of the rotation speed of the ink original roller at the time of OK, the setting value of the draw ratio, paper information (for example, paper type, paper width, weight), ink information (for example, ink type), printing machine It consists of information such as the temperature of the room where P is installed and the set value of the drying temperature. On the other hand, the ink key information includes the pattern area ratio (the pattern area ratio of the divided region 200 corresponding to the ink key), preset value, OK value, and ink key opening for each ink key 1100 in each printing unit U (identified by the printing unit NO). It consists of information such as the degree of operation amount (difference between preset value and OK value). The ink key opening operation amount is not a simple difference value between the preset value and the OK value, but a value having a direction of “+” or “−”, that is, the direction from the preset value to “+” or “−”. This is a value indicating how much the ink key opening set value is displaced. For example, when the preset value is “+5” and the OK value is “−5”, the ink key opening operation amount is “−10”, the preset value is “−5”, and the OK value. Is “+5”, the ink key opening degree operation amount is “+10”. Further, since the ink key opening operation amount can be calculated from the preset value and the OK value, it is not included in the ink key information, and may be calculated from the preset value and the OK value as necessary.

  The setting history data 122 is accumulated instead of being overwritten and updated in the storage unit 12 (an upper limit may be set on the number of accumulated cases and deleted from old data). As will be described later, the accumulated setting history data 122 is used when the ink key opening degree characteristic data 121 is updated.

  Next, processing when the control unit 11 updates the ink key opening degree characteristic data 121 based on the setting history data 122 accumulated in the storage unit 12 will be described. The ink key opening degree characteristic data 121 is updated for each pattern area ratio. For example, when the pattern area ratio included in the most recently accumulated setting history data 122 is only four pattern area ratios 5, 15, 20, and 40%, the ink key opening degree characteristic data 121 is updated as follows: It is performed only for the portions with the pattern area ratios of 5, 15, 20, and 40%.

  Here, the case where the part of the pattern area ratio 5% in the ink key opening degree characteristic data 121 is updated will be described. The control unit 11 determines that an average value obtained from all OK values (including the latest OK value) when the pattern area ratio is 5% from the accumulated setting history data 122 is 5 for the pattern area ratio. The ink key opening degree characteristic data 121 is updated so that the ink key opening degree setting value (preset value) is set to%. That is, the control unit 11 updates the ink key opening degree characteristic data 121 based on the average value of the past OK value and the latest OK value having the same pattern area ratio. Note that if the pattern area ratio is calculated finely (for example, up to the decimal point), the setting history data 122 having the same pattern area ratio is less likely to be duplicated. It is good to calculate the pattern area ratio.

  Next, a diagnosis method for the printing press P based on the ink key opening operation amount for each ink key 1100 will be described with reference to FIGS.

[Problem cause 1: Axis misalignment of ink source roller]
As shown in FIG. 8, the axis of the ink base roller 1200 may be displaced from the ink calling roller 1210 or the ink key 1100. When the axis deviation of the ink base roller 1200 occurs, the ink supply amount is biased, so the operator changes the ink key opening setting value so as to close the ink key opening degree 1400 for the portion 1221 where the supply amount is large. The ink key opening setting value is changed so that the ink key opening 1400 is opened for the portion 1222 having a small amount. In order to determine this tendency, the control unit 11 first calculates a standard deviation and an average value of the ink key opening operation amount for each ink key 1100 from the setting history data 122 for the most recent predetermined number stored in the storage unit 12. To do.

  FIG. 9 is an example of a graph showing the standard deviation and the average value (shown as the key operation amount in FIG. 9) of the ink key opening operation amount when the axis deviation of the ink base roller 1200 occurs. . In FIG. 9, the standard deviation and the average value are not shown for the ink keys 1100 of the keys Nos. 1, 2, 28, and 29. (This is the same for FIGS. 10 and 11).

  As shown in FIG. 9, when the axial displacement of the ink base roller 1200 occurs, the average value of the ink keys 1100 located at both ends tends to open on the one hand and closes on the other hand. Therefore, when such a tendency is detected, the control unit 11 diagnoses that the axis deviation of the ink source roller has occurred. There are various methods for detecting this tendency. For example, the average values of the ink keys 1100 (the ink key of key NO3 and the ink key of key NO27 in FIG. 9) located at both ends are connected by a straight line, and the inclination of the straight line is a predetermined value. In the case described above, it can be diagnosed that the axial displacement of the ink base roller 1200 has occurred. In addition, when the average value of the ink key opening operation amount of each ink key 1100 is approximated by a linear function using the least square method, the slope of a straight line is calculated, and when the calculated slope is equal to or greater than a predetermined value, It may be diagnosed that the axis deviation of the original roller 1200 has occurred.

  In addition, as the predetermined value in “when the inclination of the straight line is equal to or larger than a predetermined value”, for example, a value such as “inclination warning determination value = 1.0” can be arbitrarily set. The specific “tilt warning judgment value” is preferably set to an appropriate value by repeating the test. Also, depending on the possibility that the ink fountain roller is misaligned, for example, for each of three warning levels (warning level “low”, warning level “medium”, warning level “high”) "Inclination warning judgment value" according to the warning level selected by the operator may be set.

[Cause # 2: Zero shift of ink key]
Next, a method for diagnosing whether or not the zero point deviation of the ink key 1100 has occurred will be described. The zero point of the ink key 1100 is a reference distance (ink key opening 1400) between the ink key 1100 and the ink source roller 1200 set for each printing model. When the zero point of the ink key 1100 is deviated in the opening direction of the ink key opening 1400, the ink supply amount is larger than when the zero point is not deviated, whereas the ink key opening 1400 is deviated in the closing direction. In this case, the ink supply amount becomes smaller than when the zero point is not shifted. Therefore, in order to control the ink key 1100 appropriately, it is important that the zero point of the ink key 1100 is not shifted.

  At locations where the zero point of the ink key 1100 is shifted, the ink supply amount always increases or decreases, so the operator tends to set the ink key opening setting value to be smaller or larger than the preset value. In order to determine this tendency, the control unit 11 first calculates a standard deviation and an average value of the ink key opening operation amount for each ink key 1100 from the setting history data 122 for the most recent predetermined number stored in the storage unit 12. To do.

  FIG. 10 is an example of a graph showing the standard deviation and the average value (shown as the key operation amount in FIG. 10) of the ink key opening operation amount when the zero point of the ink key 1100 is shifted in the opening direction. . As shown in FIG. 10, when the zero point of the ink key 1100 is shifted, the standard deviation and the average value tend to be distributed in the “+” region or the “−” region as a whole. Therefore, when such a tendency is detected, the control unit 11 diagnoses that the zero point of the ink key 1100 is shifted. There are various methods for detecting this tendency. For example, the number of ink keys 1100 whose standard deviation is equal to or less than a set value is equal to or greater than a predetermined number, and the absolute value of the average value is equal to or greater than the set value. When the number is equal to or greater than the predetermined number, it can be diagnosed that the zero point of the ink key 1100 is shifted.

  The set value in “the number of ink keys 1100 whose standard deviation is equal to or less than the set value” can be arbitrarily set as “zero point deviation determination value = 10”. A value such as “zero point deviation warning judgment value = 15” can be arbitrarily set. In addition, the setting value in “the number of ink keys 1100 whose absolute value of the average value is equal to or larger than the predetermined value is equal to or larger than the predetermined number” can be arbitrarily set to a value such as “zero point defect determination value = 10”. As such, a value such as “zero-point failure warning judgment value = 15” can be arbitrarily set. The specific “zero point deviation amount judgment value”, “zero point deviation warning judgment value”, “zero point failure judgment value”, and “zero point failure warning judgment value” are preferably set to appropriate values by repeating the test. Further, according to the possibility that the ink key has a zero point deviation, for example, a “zero point deviation amount judgment value” for each of three warning levels (warning level “low”, warning level “medium”, warning level “high”). , “Zero deviation warning judgment value”, “Zero defect judgment value”, “Zero fault warning judgment value” are defined, “Zero deviation judgment value”, “Zero deviation warning judgment” according to the warning level selected by the operator. “Value”, “zero-point failure judgment value”, and “zero-point failure warning judgment value” may be set.

[Cause 3: Ink key malfunction]
Next, a method for diagnosing whether or not the ink key 1100 has malfunctioned will be described. There are several possible causes for the ink key 1100 to malfunction. For example, it is conceivable that the ink is fixed between adjacent ink keys 1100 (for example, a portion indicated by B in FIG. 2), and the ink key 1100 is malfunctioning. Further, there may be a case where there is a difference in the operation amount between the ink keys 1100 even if the same ink key opening setting value is set due to mechanical factors (mechanism and gear backlash, ink sticking, etc.). In such a case, with respect to the ink key 1100 that has caused a malfunction, the operator tries to adjust the ink key opening 1400 forcibly, so that the operation amount of the ink key opening in both the “+” direction and the “−” direction is different. It tends to grow. In order to determine this tendency, the control unit 11 first calculates a standard deviation and an average value of the ink key opening operation amount for each ink key 1100 from the setting history data 122 for the most recent predetermined number stored in the storage unit 12. To do.

  FIG. 11 is an example of a graph showing standard deviations and average values (indicated as key operation amounts in FIG. 11) of ink key opening operation amounts when some of the ink keys 1100 are malfunctioning. is there. As shown in FIG. 11, the standard deviation of the operation amount of the ink key opening becomes large for the ink key 1100 that has caused the malfunction (in FIG. 11, the ink keys 1100 of key Nos. “18” to “22”). Tend to vary). Therefore, when such a tendency is detected, the control unit 11 identifies the key NO of the ink key 1100 in which the operation failure has occurred and diagnoses that the operation failure has occurred in the ink key 1100. There are various methods for detecting this tendency. For example, it is determined whether the standard deviation of each ink key 1100 exceeds the set value. If there is an ink key 1100 whose standard deviation exceeds the set value, the ink key 1100 is present. Is diagnosed as malfunctioning at the same time (the key number of the ink key 1100 in which malfunctioning has occurred is specified at the same time).

  As the set value for “whether the standard deviation exceeds the set value”, a value such as “operation failure judgment value = 10” can be arbitrarily set. The specific “operation failure judgment value” is preferably set to an appropriate value by repeating the test. Also, depending on the possibility that the ink key malfunctions, for example, the “malfunction determination value” is set for each of the three warning levels (warning level “low”, warning level “medium”, and warning level “high”). It is also possible to set the “operation failure judgment value” according to the warning level selected by the operator.

[Defect cause identification table]
As described above, the cause of the problem can be identified from the standard deviation or average value of the ink key opening operation amount. A summary of this is the failure cause identification table 123 of FIG. The failure cause identification table 123 defines at least one of a condition regarding standard deviation and a condition regarding average value for each cause of failure. The control unit 11 refers to the setting history data 122 accumulated in the storage unit 12 to calculate the standard deviation and average value of the ink key opening operation amount, and is defined in the calculated standard deviation and average value and the failure cause identification table 123. The cause of the malfunction is specified by comparing each condition.

  Next, printing processing by the control unit 11 of the operator terminal 1 will be described with reference to the flowchart of FIG. The printing process is performed for each printing unit U (that is, printing colors C, M, Y, and K). The printing process is started when a test printing start operation by the operator is detected.

  First, the control unit 11 of the operator terminal 1 calculates a pattern area ratio for each ink key 1100 based on the plate making data (step S1). Next, the control unit 11 acquires a preset value for each ink key 1100 based on the pattern area ratio calculated in the process of step S1 and the ink key opening degree characteristic data 121 stored in the storage unit 12 (step S2). .

  Next, the control unit 11 transmits test printing start instruction information including ink key opening degree control information indicating the preset value of each ink key 1100 acquired in the process of step S2 to the printing press P (step S3). Thereby, the printing press P controls the ink key opening 1400 of each ink key 1100 according to the preset value indicated by the ink key opening control information included in the received test printing start instruction information, and performs the test printing.

  Next, the operator compares the printed matter that has been trial printed with the printing press P with a color sample that represents a desired color tone. At this time, when the operator determines that the color tone of the printed material matches the desired color tone, the operator performs an OK operation from the operation unit 14. On the other hand, when it is determined that the color tone of the printed material does not match the desired color tone, the key number of the ink key 1100 for changing the ink key opening setting value and the changed ink key opening setting value are input from the operation unit 14. The operator repeats the adjustment of the ink key opening setting value (ink key opening 1400) and the trial printing until the color tone of the printed matter becomes a desired color tone.

  On the other hand, the control unit 11 of the operator terminal 1 stands by after the processing of step S3 until an OK operation by the operator or an instruction to change the ink key opening setting value is input (step S4: NO, step S5: NO). . When it is determined that the ink key opening change instruction has been input (step S5: YES), the control unit 11 sets the ink key opening setting value of the ink key 1100 identified by the input key NO to the input ink key opening. It is changed (set) according to the degree setting value (step S6), and the test printing start instruction information is transmitted to the printing press P again (step S3).

  Further, when it is determined that an OK operation has been input (step S4: YES), the control unit 11 acquires an ink key opening setting value (OK value) for each ink key 1100 when the OK operation has been input ( Step S7). Next, the control unit 11 calculates, for each ink key 1100, the difference between the preset value acquired in step S2 and the ink key opening setting value (OK value) acquired in step S7 as the ink key opening operation amount. (Step S8).

  Next, the control unit 11 determines whether or not the calculated ink key opening degree operation amount is greater than a predetermined threshold value (step S9). Specifically, it is determined whether or not the number of ink keys 1100 whose ink key opening degree operation amount is greater than a predetermined threshold is equal to or greater than a predetermined number. This process is a process for not storing the setting history data 122 when an exceptional adjustment operation of the ink key opening 1400 is performed. For example, if there is a special request from a client who requests a printed matter, such as printing with a darker color than usual, printing will be performed at an ink key opening 1400 larger than usual. When an exceptional adjustment operation is performed, the processing of steps S10 to S13 described later is not performed. Therefore, as the predetermined threshold, a value that can determine whether or not the adjustment operation is exceptional is set. Also, the predetermined number can be arbitrarily set to “1” or half the number of all ink keys. In addition to the case where the condition of step S9 is satisfied, the process of steps S10 to S13 is also performed when the operator determines that the setting history data 122 should not be stored and inputs a predetermined exclusion operation from the operation unit 14. It may not be performed. By doing so, it is possible to prevent the cause of the malfunction from being erroneously specified by the exceptional ink key opening operation amount.

  When it is determined that the ink key opening degree operation amount is larger than the predetermined threshold (step S9: YES), the control unit 11 ends the printing process. On the other hand, when the control unit 11 determines that the ink key opening degree operation amount is not larger than the predetermined threshold (step S9: NO), the setting history data 122 is registered in the storage unit 12 (step S10). Next, the control unit 11 performs a diagnosis process based on the setting history data 122 stored in the storage unit 12 (step S11). Specifically, as described above, the control unit 11 performs the diagnosis process related to “axial misalignment of the ink original roller” (cause 1), the diagnosis process related to “zero deviation of the ink key” (cause 2), and the “ink key malfunction”. Diagnosis processing relating to (Cause 3) is performed individually. In addition, regarding the “ink key malfunction” (cause 3), the key number of the ink key 1100 causing the malfunction is also specified.

  Next, the control part 11 determines whether there was abnormality as a result of a diagnostic process (step S11) (step S12). When it is determined that there is no abnormality (step S12: NO), the control unit 11 ends the printing process. On the other hand, if it is determined that there is an abnormality (step S12: YES), the control unit 11 performs a warning process (step S13). Specifically, if the result of the diagnostic processing is that there is an abnormality of “axial misalignment of the ink fountain roller” (cause 1), the controller 11 causes the ink fountain roller 1200 as shown in FIG. A warning message suggesting the possibility that the axis is shifted is displayed on the display unit 13. Further, as a result of the diagnosis process, the control unit 11 may detect that the zero point of the ink key 1100 is shifted as shown in FIG. 14B when there is an abnormality of “zero shift of the ink key” (cause 2). A warning message suggesting sex is displayed on the display unit 13. In addition, as a result of the diagnosis processing, when there is an abnormality of “ink key malfunction” (cause 3), the control unit 11 causes an ink key 1100 that may cause malfunction as shown in FIG. A warning message that suggests the possibility that the ink key 1100 is malfunctioning is displayed on the display unit 13 together with the key NO. When the process of step 13 is completed, the control unit 11 ends the printing process.

  As described above, the control unit 11 of the operator terminal 1 of the present embodiment uses, for each ink key 1100, the preset value of the ink key opening setting value and the ink key opening setting value when a predetermined print quality is obtained. A certain OK value (an example of the “OK ink key opening setting value” of the present invention) is acquired, and the ink key opening operation amount, which is the difference between the preset value and the OK value, is recorded in the storage unit 12. The control unit 11 also identifies the cause of the malfunction of the printing press P based on the ink key opening operation amount stored in the storage unit 12. That is, when a malfunction occurs in the printing press P, a certain tendency appears, and the cause of the malfunction of the printing press P can be identified based on the operation amount of the ink key opening, thereby reducing the maintenance time. Can do.

  Further, the control unit 11 of the operator terminal 1 calculates the average value of the ink key opening operation amount for each ink key 1100 based on the ink key opening operation amount for the most recent predetermined number stored in the storage unit 12, and calculates the calculation. When the average values are arranged in the order of arrangement of the ink keys 1100 in the printing press P, if the straight line obtained from the set of average values is larger than a predetermined inclination (inclination warning judgment value), the axis deviation of the ink original roller 1200 occurs. Is identified as the cause of the malfunction. Accordingly, when the average value of the ink key opening operation amount calculated for each ink key 1100 that appears when the axis deviation of the ink base roller 1200 occurs is arranged in the arrangement order of the ink keys 1100 in the printing press P, the average value is obtained. Based on the tendency that the straight line obtained from this set is larger than a predetermined inclination, it is possible to diagnose whether or not the axis deviation of the ink source roller 1200 has occurred.

  Further, the control unit 11 of the operator terminal 1 calculates, for each ink key 1100, the standard deviation and the average value of the ink key opening operation amount based on the ink key opening operation amounts for the most predetermined number stored in the storage unit 12. The number of ink keys whose standard deviation is equal to or less than a set value (zero deviation determination value) is equal to or greater than a predetermined number (zero deviation warning determination value), and the absolute value of the average value is a set value (zero defect determination). When the number of ink keys equal to or greater than (value) is equal to or greater than a predetermined number (zero-point failure warning determination value), the fact that the zero point of the ink key is shifted is specified as the cause of the malfunction. As a result, there are more than a predetermined number of ink keys whose standard deviation of the ink key opening operation amount is equal to or less than the set value, which appears when the zero point of the ink key 1100 is deviated, and the average value of the ink key opening operation amount is equal to or more than the set value Based on the tendency that there are a predetermined number or more of the ink keys, it is possible to diagnose whether or not the zero point of the ink key 1100 is displaced.

  Further, the control unit 11 of the operator terminal 1 calculates the standard deviation of the ink key opening operation amount for each ink key 1100 based on the ink key opening operation amount for the most recent predetermined number stored in the storage unit 12, and the standard deviation When there is an ink key 1100 that exceeds the set value (operation failure judgment value), the fact that the ink key 1100 has an operation failure is identified as the cause of the failure. Thus, based on the tendency that the standard deviation of the ink key opening operation amount exceeds the set value that appears when the ink key 1100 malfunctions, it is diagnosed whether the ink key 1100 malfunctions. Can do.

  Moreover, the control part 11 of the operator terminal 1 presents the said cause of a malfunction, and warns, when a malfunction cause is specified. As a result, when the cause of the malfunction is identified, the cause of the malfunction is presented / warned, so that the operator can easily identify the cause of the malfunction and can immediately start the maintenance work.

  In the present embodiment, when diagnosing the axis misalignment (cause of failure 1) of the ink base roller, the control unit 11 uses the setting history data 122 for the most recent predetermined number stored in the storage unit 12 for each ink key 1100. Calculating an average value of the operation amount of the ink key opening and determining whether a condition corresponding to the axis deviation of the ink source roller (a condition that a straight line calculated from the average value is equal to or greater than a predetermined inclination) is satisfied; However, instead of calculating the average value, the ink key opening operation amount of each ink key 1100 is acquired from the most recent setting history data 122 (that is, the latest setting history data 122), and the acquired ink key opening is obtained. It is also possible to calculate a straight line from the manipulated variable and determine the condition whether the inclination is equal to or greater than a predetermined inclination.

DESCRIPTION OF SYMBOLS 1 Operator terminal 11 Control part 12 Memory | storage part 121 Ink key opening characteristic data 122 Setting log | history data 123 Fault cause specific table 13 Display part 14 Operation part 15 Communication part P Printing machine U1-U4 Printing unit 1100 Ink key 1200 Ink original roller 1300 Ink fountain 1400 Ink key opening S Offset rotary printing system

Claims (7)

A printing press diagnostic apparatus for diagnosing a printing press having a plurality of ink keys,
Preset value acquisition means for acquiring a preset value of the ink key opening setting value for each ink key;
OK value acquisition means for acquiring an OK ink key opening setting value that is an ink key opening setting value when a predetermined print quality is obtained for each ink key;
Difference value recording means for recording difference value information indicating a difference value between the preset value acquired by the preset value acquisition means and the OK ink key opening setting value acquired by the OK value acquisition means in the difference value storage means; ,
Diagnostic means for identifying the cause of the malfunction of the printing press based on the difference value indicated by the difference value information stored in the difference value storage means;
Equipped with a,
The diagnostic means calculates an average value of the difference values based on the difference value information for the most recent predetermined number stored in the difference value storage means for each ink key, and the calculated average value is calculated in the printing press. When the inclination of the straight line obtained from the set of average values is larger than the inclination warning judgment value when the ink keys are arranged in the order of arrangement, it is specified as the cause of the defect that the ink source roller is misaligned. Printing press diagnostic device. A printing press diagnostic apparatus for diagnosing a printing press having a plurality of ink keys,
Preset value acquisition means for acquiring a preset value of the ink key opening setting value for each ink key;
OK value acquisition means for acquiring an OK ink key opening setting value that is an ink key opening setting value when a predetermined print quality is obtained for each ink key;
Difference value recording means for recording difference value information indicating a difference value between the preset value acquired by the preset value acquisition means and the OK ink key opening setting value acquired by the OK value acquisition means in the difference value storage means; ,
Diagnostic means for identifying the cause of the malfunction of the printing press based on the difference value indicated by the difference value information stored in the difference value storage means;
With
The diagnostic means calculates, for each ink key, a standard deviation and an average value of difference values based on the difference value information for the most recent predetermined number stored in the difference value storage means, and the standard deviation is a zero point deviation amount. When the number of ink keys equal to or less than the determination value is equal to or greater than the zero point deviation warning determination value and the number of ink keys whose absolute value of the average value is equal to or greater than the zero point defect determination value is equal to or greater than the zero point defect warning determination value, The printing press diagnostic apparatus characterized in that the zero point of the ink key is shifted as the cause of the malfunction . The printing press diagnostic apparatus according to claim 1 or 2,
When the cause of the malfunction is specified by the diagnostic means, warning means for presenting and warning the cause of the malfunction,
A printing press diagnostic apparatus , further comprising: A computer included in a printing press diagnostic device for diagnosing a printing press having a plurality of ink keys;
Preset value acquisition means for acquiring a preset value of the ink key opening setting value for each ink key,
OK value acquisition means for acquiring an OK ink key opening setting value that is an ink key opening setting value when a predetermined print quality is obtained for each ink key;
Difference value recording means for recording difference value information indicating a difference value between the preset value acquired by the preset value acquisition means and the OK ink key opening setting value acquired by the OK value acquisition means in a difference value storage means;
  Diagnostic means for identifying the cause of the malfunction of the printing press based on the difference value indicated by the difference value information stored in the difference value storage means;
Function as
The diagnostic means calculates an average value of the difference values based on the difference value information for the most recent predetermined number stored in the difference value storage means for each ink key, and the calculated average value is calculated in the printing press. When the inclination of the straight line obtained from the set of average values is larger than the inclination warning judgment value when the ink keys are arranged in the order of arrangement, it is specified as the cause of the defect that the ink source roller is misaligned. Printing press diagnostic program. A computer included in a printing press diagnostic device for diagnosing a printing press having a plurality of ink keys;
Preset value acquisition means for acquiring a preset value of the ink key opening setting value for each ink key,
OK value acquisition means for acquiring an OK ink key opening setting value that is an ink key opening setting value when a predetermined print quality is obtained for each ink key;
Difference value recording means for recording difference value information indicating a difference value between the preset value acquired by the preset value acquisition means and the OK ink key opening setting value acquired by the OK value acquisition means in a difference value storage means;
Diagnostic means for identifying the cause of the malfunction of the printing press based on the difference value indicated by the difference value information stored in the difference value storage means;
Function as
The diagnostic means calculates, for each ink key, a standard deviation and an average value of difference values based on the difference value information for the most recent predetermined number stored in the difference value storage means, and the standard deviation is a zero point deviation amount. When the number of ink keys equal to or less than the determination value is equal to or greater than the zero point deviation warning determination value and the number of ink keys whose absolute value of the average value is equal to or greater than the zero point defect determination value is equal to or greater than the zero point defect warning determination value, A printing press diagnostic program characterized in that the zero point of the ink key is shifted as the cause of the malfunction. A printing press diagnostic method executed by a printing press diagnostic apparatus for diagnosing a printing press having a plurality of ink keys,
For each ink key, obtaining a preset value of the ink key opening setting value;
Obtaining an OK ink key opening setting value, which is an ink key opening setting value when a predetermined print quality is obtained for each ink key;
Recording difference value information indicating a difference value between the acquired preset value and the acquired OK ink key opening setting value in a difference value storage means;
Identifying the cause of the malfunction of the printing press based on the difference value indicated by the difference value information stored in the difference value storage means;
Including
In the step of identifying the cause of the defect, for each ink key, an average value of difference values is calculated based on the difference value information for the most recent predetermined number stored in the difference value storage means, and the calculated average value is calculated. Identified as the cause of the malfunction when the inclination of the straight line obtained from the set of average values is larger than the inclination warning judgment value when arranged in the order of the arrangement of the ink keys in the printing press as the cause of the malfunction A method for diagnosing a printing press. A printing press diagnostic method executed by a printing press diagnostic apparatus for diagnosing a printing press having a plurality of ink keys,
For each ink key, obtaining a preset value of the ink key opening setting value;
Obtaining an OK ink key opening setting value, which is an ink key opening setting value when a predetermined print quality is obtained for each ink key;
Recording difference value information indicating a difference value between the acquired preset value and the acquired OK ink key opening setting value in a difference value storage means;
Identifying the cause of the malfunction of the printing press based on the difference value indicated by the difference value information stored in the difference value storage means;
Including
In the step of identifying the cause of the defect, for each ink key, a standard deviation and an average value of the difference value are calculated based on the difference value information for the most recent predetermined number stored in the difference value storage unit, and the standard deviation is calculated. The number of ink keys for which the absolute value of the average value is greater than or equal to the zero-point failure judgment value is greater than or equal to the zero-point failure warning judgment value. In some cases, the fact that the zero point of the ink key is shifted is specified as the cause of the malfunction, and the printing press diagnosis method is characterized in that:

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