JP4946091B2 - Blanket cleaning apparatus and blanket cleaning method for cleaning by controlling the timing of blanket cleaning - Google Patents

Description

The present invention relates to a method of cleaning ink deposited on a transfer cylinder from a printing cylinder (plate cylinder) in an offset printing apparatus.

Conventionally, when printing continuously for a long time, the transfer rate of ink from the transfer cylinder of the printing device to the paper surface gradually decreases, and residual ink increases on the transfer cylinder (blanket piling). I know it. When blanket piling develops and the residual ink increases, the formation of halftone dots on the printed surface of the paper is hindered, and the pattern can be visually checked and the quality is poor. Therefore, various measures are taken to suppress the amount of ink remaining on the transfer cylinder, which adversely affects the print quality.

For example, Patent Document 1 discloses a technique in which the surface of a transfer cylinder of a printing apparatus is subjected to a hydrophilic treatment to prevent ink from remaining, and the residual ink is not transferred to the transfer cylinder. (Prior art 1)
JP 2004-195868 (page 4-5)

By the way, in the prior art 1, in order to prevent print quality defects, it is necessary for the printing apparatus operator to visually check the printed matter in operation and clean the transfer cylinder before the print quality defects occur. is there. Therefore, in order to be concerned about the occurrence of defects and the outflow of defective print quality products to the next process, early cleaning is performed, and as a result, the transfer cylinder cleaning is performed more frequently than appropriate. There were drawbacks.
Also, when resuming the printing operation after cleaning the transfer cylinder, due to the adjustment work until the printing state becomes steady, defective products (damaged paper) will be lost. Many things were also problematic from the viewpoint of resource saving and environmental measures.
On the other hand, if the cleaning time of the transfer cylinder is delayed, defective print quality occurs, the printing material is wasted, and the productivity is reduced by reprinting.

The present invention has been made in consideration of such a conventional technique. An object of the present invention is to determine an appropriate time for cleaning the transfer cylinder of a printing apparatus and to provide an instruction for cleaning. Is to provide.

The present invention solves the above problems by the following means. That is, the invention of claim 1 is a print transfer cylinder cleaning system comprising: a print transfer cylinder cleaning instruction apparatus; a print control apparatus; a printing apparatus having a print transfer cylinder; and a cleaning apparatus. The indicating device measures the ink film outside the printing area of the printing medium, storage means for storing the ink film density data and the limit value of the ink film density, limit value input means for receiving the input of the limit value, Ink film concentration measurement means for creating and maintaining ink film concentration data, cleaning start time calculating means for calculating the cleaning start time from the limit value and ink film concentration data, the ink film concentration measuring means, and the cleaning start Repeat until the time calculating means the operation is the current time coincides with the washing start time, when the current time coincides with the cleaning start time, cleaning start finger issues a cleaning start instruction The printing control apparatus includes: a cleaning start instruction receiving unit that receives a cleaning start instruction; a cleaning option display unit that displays a cleaning method option; and a cleaning method reception unit that receives the selected cleaning method. A printing apparatus control means for issuing a print transfer cylinder control request including the accepted cleaning method; and a cleaning apparatus control means for issuing a cleaning request including the accepted cleaning method. A printing transfer cylinder control unit that receives the printing transfer cylinder control request and controls the printing transfer cylinder according to the received cleaning method, and the cleaning apparatus receives and receives the cleaning request. A printing transfer cylinder cleaning system comprising printing transfer cylinder cleaning means for cleaning the printing transfer cylinder according to the cleaning method.

Therefore, the optical densitometer can measure the residual ink amount in the printing transfer cylinder by measuring the ink film density in the non-printing area of the print medium. In addition, the printing transfer cylinder of each printing unit can be cleaned.

The invention of claim 2 is a storage means for storing ink film density data and ink film density limit values, limit value input means for accepting input of limit values, and measuring an ink film outside the printing area of the printing medium. The ink film concentration measurement means for creating and maintaining ink film concentration data, the cleaning start time calculating means for calculating the cleaning start time from the limit value and the ink film concentration data, and the ink film concentration measuring means, The cleaning start time calculating means repeats the operation until the current time matches the cleaning start time, and if the current time matches the cleaning start time, a cleaning start instruction means for issuing a cleaning start instruction is provided. This is a cleaning instruction device.

The invention of claim 3 is a printing transfer cylinder cleaning method using the limit value of the ink film concentration and the ink film density data, and measures the ink film outside the printing area of the printing medium, and the ink film density data The ink film concentration measurement step to be held, the cleaning start time calculation step to calculate the cleaning start time from the limit value and the ink film concentration data, the ink film concentration measurement step and the cleaning start time calculation step Repeat until the current time matches the cleaning start time, and when the current time matches the cleaning start time, the cleaning start instruction step for issuing the cleaning start instruction, and the cleaning option for receiving the cleaning start instruction and displaying the cleaning method options A display step; a cleaning method receiving step for receiving the selected cleaning method; and a printing transfer cylinder including the received cleaning method An apparatus control step for issuing a control request and a cleaning request including the received cleaning method, and accepting the print transfer cylinder control request, and depending on the received cleaning method, a print transfer cylinder A printing transfer cylinder control step for controlling the printing transfer cylinder, and a printing transfer cylinder cleaning step for receiving the cleaning request and cleaning the printing transfer cylinder according to the received cleaning method. The printing transfer cylinder cleaning method.

According to a fourth aspect of the present invention, there is provided a computer program that, when incorporated in a computer, causes the computer to operate as the registration sensor light source selection type print registration control system or the registration sensor light source selection device according to the first or second aspect. is there.

The invention of claim 5 is a computer-readable recording medium on which the computer program according to claim 4 is recorded.

According to the present invention, by instructing an appropriate cleaning time for the transfer cylinder of the printing apparatus, it is possible to prevent unnecessary stopping of the printing apparatus, thereby improving the productivity of the printing apparatus. Further, by preventing the unnecessary printing apparatus from being stopped, the printing material is not wasted due to the adjustment work in resuming the printing work, contributing to resource saving and environmental measures.

(Example)
Hereinafter, embodiments of the present invention will be described in more detail with reference to the drawings. FIG. 1 is a diagram illustrating an outline of a printing transfer cylinder cleaning system. The print transfer cylinder cleaning system 1 is configured by connecting a print transfer cylinder cleaning instruction apparatus 100, a print control apparatus 300, a printing apparatus 700, and a cleaning apparatus 500. The printing transfer cylinder cleaning instruction device 100 includes an ink film measuring device 110 (for example, an optical color densitometer) and ink film density data 191. The print control device 300 controls the printing device 700 and the cleaning device 500. The printing apparatus 700 includes a printing unit 750 having a plate cylinder 755 and a printing transfer cylinder 757. The printing unit 750 prints the ink image formed by the plate cylinder 755 on the print medium 900 via the print transfer cylinder 757.

Here, the ink film measuring device 110 may be provided in each printing unit 750 or may be provided in the last printing unit 750 of printing. The ink film measuring device 110 may be an ink film thickness meter or a spectrocolorimeter instead of the optical color densitometer.

Furthermore, since the measurement result of the ink film of the print medium 900 may vary depending on the print medium 900, an optical color densitometer for referring to the variation factor for measuring the density of the print medium 900 is separately installed. Also good.

In the present invention, the ink film density data 191 is an ink density value obtained by measuring a portion other than the ink image portion formed by the plate cylinder 730 on the printing medium 900.

FIG. 2 illustrates a rough process flow of the printing transfer cylinder cleaning system. The ink film measuring device 110 of the printing transfer cylinder cleaning instruction apparatus 100 measures the ink film outside the printing area of the printing medium (for example, a position sufficiently outside the registration mark printing position of the printing medium), and the ink film data. Is created (FIG. 2 (1)). The printing transfer cylinder cleaning instructing device 100 receives the limit value of the ink film input by the printing device operator ((2)).

The print transfer cylinder cleaning instruction device 100 predicts the time when the ink film reaches the limit value by using the ink film data, and calculates the cleaning start time ((3)).

The print transfer cylinder cleaning instruction device 100 issues a cleaning start instruction when the cleaning start time comes ((4)).

The print control apparatus 300 receives a cleaning start instruction, generates an alarm sound, and displays cleaning method options ((5)). The print control apparatus 300 receives the selected cleaning method, generates an alarm sound, and issues a print transfer cylinder control request and a cleaning request including the selected cleaning method ((6)). The printing apparatus 700 receives the print transfer cylinder control request and controls the rotation of the print transfer cylinder 310 according to the selected cleaning method ((7)). The cleaning device 500 receives the cleaning request and cleans the print transfer cylinder 310 according to the selected cleaning method ((8)).
At this time, the print transfer cylinder 757 of all the printing units may be washed, or only the print transfer cylinder 757 whose ink film has reached the limit value may be washed.

FIG. 3 is a detailed configuration diagram of the printing transfer cylinder cleaning system. The print transfer cylinder cleaning system 1 is configured by connecting a print transfer cylinder cleaning instruction apparatus 100, a print control apparatus 300, a printing apparatus 700, and a cleaning apparatus 500.

The print transfer cylinder cleaning instruction device 100 includes an ink film concentration measuring unit 110, a limit value input unit 120, a cleaning start time calculation unit 140, a cleaning start instruction unit 150, and a storage unit 190. The storage unit 190 stores ink film density data 191 and a limit value 193.

The limit value input unit 120 receives an input of the limit value 193 of the ink film concentration. The ink film concentration measuring means 110 measures the ink film, creates ink film concentration data 191 and holds it. The cleaning start time calculation unit 140 calculates the cleaning start time from the limit value and the ink film density data.
The cleaning start instruction unit 150 issues a cleaning start instruction when the current time coincides with the cleaning start time.

The print control apparatus 300 includes a cleaning start instruction receiving unit 350, a cleaning option display unit 353, a cleaning method receiving unit 356, a printing device control unit 360, and a cleaning device control unit 370.

The cleaning start instruction receiving unit 350 receives a cleaning start instruction. The cleaning option display means 353 selects the cleaning method (for example, “1. Cleaning without changing the rotation speed of the printing transfer cylinder”, “2. Unplugging from the printing unit without changing the rotation speed of the printing transfer cylinder”). "3. After the rotation of the printing press is stopped, the printing transfer cylinder is slowly rotated and cleaned.") Is displayed. The cleaning method reception unit 356 receives a cleaning method selected from cleaning method options. The printing apparatus control unit 360 issues a print transfer cylinder control request including the accepted cleaning method. The cleaning device control unit 370 issues a cleaning request including the accepted cleaning method.

The cleaning device 500 includes a printing transfer cylinder cleaning unit 570.

The print transfer cylinder cleaning unit 570 receives the cleaning request and cleans the print transfer cylinder in accordance with the received cleaning method.

The printing apparatus 700 includes a print transfer cylinder control unit 760.

The print transfer cylinder control unit 760 receives the print transfer cylinder control request, and controls the print transfer cylinder according to the received cleaning method.

The ink film density measuring means 110 is an optical densitometer. The storage unit 190 is a memory. Limit value input means 120, cleaning start time calculation means 140, cleaning start instruction means 150, cleaning start instruction reception means 350, cleaning option display means 353, cleaning method reception means 356, printing apparatus control means 360, The cleaning device control unit 370, the print transfer cylinder cleaning unit 570, and the print transfer cylinder control unit 760 are computer programs. The ink film density data 191 and the limit value 193 are data readable by a computer program.

FIG. 4 is an explanatory diagram of ink film thickness measurement positions. The transfer cylinder 757 is formed with a printing area 757 a to which the ink in the printing area of the plate cylinder 755 has been transferred, and a non-printing area 757 b corresponding to a margin. The ink in the printing region 757a and the non-printing region 757b of the transfer cylinder 757 is transferred to the printing medium 900 and printed. At this time, the print medium 900 is formed with a print area 900a on which the transfer cylinder print area 757a is printed and a non-print area 900b on which the transfer cylinder non-print area 757b is printed. Therefore, the optical densitometer 110 measures the ink film concentration in the non-printing area 900b of the print medium 900, and creates ink film density data 191.

Thus, the optical densitometer 110 can measure the residual ink amount by measuring the ink film density in the non-printing area 900b of the printing medium 900.

FIG. 5 is an explanatory diagram of a procedure for calculating the cleaning start time. The measurement of the ink film is performed darkly at a predetermined time interval 191c. First, the first ink film is measured, ink film density data 191a is created, and held as the previous ink film density data 191a (FIG. 5A). After a predetermined time (for example, every 10 minutes) 191c has elapsed, the ink film is measured, ink film density data 191b is created, and this time is stored as ink film density data 191b ((i)). .

Next, the predicted time 140a is calculated from the ink film density data 191b measured this time, the ink film density data 191a measured last time, and the limit value 193. For example, the difference between the ink film density data 191b measured this time and the ink film density data 191a measured last time is obtained, and the difference between the limit value 193 and the ink film density data 191a measured this time is divided. The time 191c is multiplied to calculate the predicted time 140a (same (c)). The current time is added to the predicted time 140a to calculate the cleaning start time 140b (same (D)). The ink film density data 191b measured this time is retained as the ink film density data 191a measured last time ((v)).

Thereafter, until the time comes when the cleaning start time 140b coincides with the current time, (a) to (e) are repeated at predetermined time intervals 191c.

As described above in detail, according to the present invention, the productivity of the printing apparatus has been improved by instructing an appropriate cleaning time for the transfer cylinder of the printing apparatus, thereby preventing unnecessary stopping of the printing apparatus. In addition, by preventing useless printing devices from being stopped, printing materials were not wasted due to adjustment work when resuming printing work, which contributed to resource saving and environmental measures.

Overview of printing transfer cylinder cleaning system Rough processing flow of printing transfer cylinder cleaning system Detailed configuration diagram of printing transfer cylinder cleaning system Illustration of ink film thickness measurement position Procedure for calculating the cleaning start time

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Print transfer cylinder washing | cleaning system 100 Print transfer cylinder washing | cleaning instruction | indication apparatus 110 Ink film density | concentration measurement means 120 Limit value input means 140 Cleaning start time calculation means 140a Estimated time 150 Cleaning start instruction means 191 Ink film density data 191a Ink film density measured last time Data 191b Ink film density data 191c measured this time Predetermined time 193 Limit value 300 Print control device 350 Cleaning start instruction receiving means 353 Cleaning option display means 356 Cleaning method receiving means 360 Printing device control means 370 Cleaning device control means 500 Cleaning device 570 Print transfer cylinder cleaning means 700 Printing device 750 Printing unit 755 Plate cylinder 757 Print transfer cylinder 760 Print transfer cylinder control means 900 Print medium

Claims (5)

In a printing transfer cylinder cleaning system configured by connecting a printing transfer cylinder cleaning instruction apparatus, a printing control apparatus, a printing apparatus having a printing transfer cylinder, and a cleaning apparatus,
The printing transfer cylinder cleaning instructing device includes a storage means for storing ink film density data and a limit value of the ink film density, a limit value input means for receiving the input of the limit value, and an ink film outside the printing area of the printing medium. The ink film concentration measurement means for creating and holding the ink film concentration data, the cleaning start time calculating means for calculating the cleaning start time from the limit value and the ink film concentration data, and the ink film concentration measurement A cleaning start instruction means for issuing a cleaning start instruction when the current time matches the cleaning start time, and the cleaning start time calculating means repeats its operation until the current time matches the cleaning start time.
The printing control apparatus includes: a cleaning start instruction receiving unit that receives a cleaning start instruction; a cleaning option display unit that displays cleaning method options; a cleaning method receiving unit that receives a selected cleaning method; and the received cleaning method A printing apparatus control means for issuing a printing transfer cylinder control request including a cleaning apparatus control means for issuing a cleaning request including the accepted cleaning method,
The printing apparatus includes a print transfer cylinder control unit that receives the print transfer cylinder control request and controls the print transfer cylinder according to the received cleaning method.
The cleaning device includes a printing transfer cylinder cleaning unit that receives the cleaning request and cleans the printing transfer cylinder according to the received cleaning method.
Print transfer cylinder cleaning system. Storage means for storing ink film density data and ink film density limit value, limit value input means for accepting input of limit values, and measuring ink film outside the printing area of the printing medium to measure ink film density data The ink film concentration measuring means for creating and holding, the cleaning start time calculating means for calculating the cleaning start time from the limit value and the ink film concentration data, the ink film concentration measuring means and the cleaning start time calculating means A printing transfer cylinder cleaning instruction device comprising: cleaning start instruction means for repeating the operation until the current time matches the cleaning start time, and when the current time matches the cleaning start time, issues a cleaning start instruction. A printing transfer cylinder cleaning method using ink film density limit value and ink film density data,
Measure the ink film outside the print area of the print medium, create ink film concentration data, and start the cleaning to calculate the cleaning start time from the ink film concentration measurement step to be retained, the limit value and the ink film concentration data Repeat the time calculation step, the ink film concentration measurement step, and the cleaning start time calculation step until the current time matches the cleaning start time, and if the current time matches the cleaning start time, issue a cleaning start instruction A cleaning option display step that receives a cleaning start instruction and displays cleaning method options; a cleaning method reception step that receives the selected cleaning method; and a print transfer cylinder control request that includes the received cleaning method An apparatus control step for issuing a cleaning request including the accepted cleaning method,
A print transfer cylinder control step for receiving the print transfer cylinder control request and controlling the print transfer cylinder according to the accepted cleaning method; and a print transfer according to the cleaning method received for the cleaning request. A printing transfer cylinder cleaning method, comprising: a printing transfer cylinder cleaning step for cleaning the cylinder. A computer program for causing a computer to operate as the printing transfer cylinder cleaning system according to claim 1 or the printing transfer cylinder cleaning instruction apparatus according to claim 2 by being incorporated in a computer. The computer-readable recording medium which recorded the computer program of Claim 4.

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