Ink Roller Subgroup Division for Rapid Job Switching
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Solution Overview
Problem
Conventional ink supply methods in printing presses require excessive adjustment and test printing when switching between print jobs, leading to increased pre-printing preparation time, workload, material waste, and decreased production efficiency due to residual ink film thickness distributions.
Innovation Solution
The method involves dividing the ink roller group into subgroups and performing a throw-on operation for the most downstream subgroup, followed by rotating the plate cylinder and subgroup to supply ink, ensuring a thin ink film thickness distribution for efficient ink transfer and minimizing waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional ink supply method is used with printing plate replacement, then ink film thickness distribution from preceding job remains in ink roller group, but excessive adjustment and test printing are required for next job
Solution Approach 1:
The ink roller group is divided into multiple roller subgroups (first subgroup, second subgroup, etc.) that can be independently controlled. This segmentation allows selective engagement of subgroups during ink supply operations, enabling the system to manage ink film thickness distribution more effectively when switching between print jobs with different images.
Solution Approach 2:
The ink supply system dynamically adjusts which roller subgroups are engaged (thrown on) based on the specific print job requirements. By selectively throwing on only certain roller subgroups during ink supply, the system can control ink distribution patterns to match the next job's image characteristics, reducing the need for extensive test printing.
2Reliability
If ink supply is increased to ensure adequate ink coverage, then ink film thickness becomes excessive, but material waste increases
Solution Approach 1:
Different roller subgroups supply ink to different regions of the printing plate. By selectively engaging specific subgroups based on the image distribution of the next job, the system provides localized ink supply matching the actual printing requirements, avoiding excessive ink application in non-image areas and reducing material waste.
Solution Approach 2:
Instead of supplying ink through all roller subgroups simultaneously, the system uses only the necessary portion (partial action) by selectively throwing on specific subgroups. This prevents excessive ink supply while ensuring adequate coverage for the actual image areas, thereby reducing ink waste.
3Measurement precision
If test printing is performed repeatedly to adjust ink supply, then satisfactory color tone is achieved, but preparation time and workload increase
Solution Approach 1:
The system performs preliminary analysis of the next job's image characteristics and pre-configures which roller subgroups should be engaged during ink supply. This preliminary action allows the ink film thickness distribution to be more closely matched to the required specifications before actual printing begins, reducing the number of test prints needed to achieve satisfactory color tone.
Data Source
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AI summary
In an ink supply method in an ink supply apparatus including an ink fountain, a plurality of ink fountain keys, an ink fountain roller, an ink ductor roller, and an ink roller group, an ink film thickness distribution corresponding to an image on a printing plate for printing of a next job is formed in the ink roller group. The ink roller group in which the ink film thickness distribution to be used for printing of the next job is formed is divided into a plurality of roller subgroups. After or before division, a throw-on operation is performed for at least one of the plurality of roller subgroups including a most downstream roller subgroup, and a plate cylinder on which the printing plate to be used for printing of the next job is mounted. Ink in at least one of the plurality of roller subgroups is supplied to the printing plate mounted on the plate cylinder by rotating a predetermined number of times the plate cylinder and at least one of the plurality of roller subgroups, which are thrown on. An ink supply apparatus is also disclosed.