Film Inking Unit Cyclic Pivoting for Wear Reduction
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Solution Overview
Problem
Existing film inking units for offset printing struggle to balance high printing speeds with low ink removal, leading to wear and uneven ink distribution, particularly in printing forms with very low ink coverage.
Innovation Solution
The film roller in the inking unit is cyclically pivoted to varying distances from the ink duct roller, allowing for adjustable ink transfer based on frequency and time periods, ensuring continuous or intermittent ink supply to match printing requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the film roller maintains continuous contact with the ink duct roller at minimum distance, then ink supply is continuous and stable, but wear increases and ink distribution becomes uneven for low coverage printing
Solution Approach 1:
The film roller is cyclically pivoted between contact and non-contact positions with the ink duct roller. During the contact phase, ink is transferred to the film roller; during the non-contact phase, the roller is repositioned to a greater distance. This periodic engagement reduces continuous wear while maintaining reliable ink supply through controlled intervals of contact.
Solution Approach 2:
The system transitions from static continuous contact to dynamic cyclic pivoting. The film roller's position is dynamically adjusted between minimum distance (contact) and greater distance (non-contact) states, allowing the system to adapt ink transfer timing and duration to match printing requirements while reducing harmful continuous friction.
2Object-generated harmful factors
If the film roller is positioned at greater distance from the ink duct roller, then wear is reduced, but ink transfer amount decreases and may become insufficient
Solution Approach 1:
The cyclic pivoting creates defined intervals where the film roller contacts the ink duct roller at minimum distance to receive ink, followed by intervals at greater distance to reduce wear. The duration and frequency of contact phases are controlled to ensure sufficient ink transfer while limiting exposure time that causes wear.
Solution Approach 2:
The system dynamically changes the positional parameter (distance between film roller and ink duct roller) between two states: minimum distance for maximum ink transfer and greater distance for wear reduction. This parameter modulation allows optimization of both ink supply quantity and wear prevention.
3Quantity of substance
If the ink layer thickness is increased to ensure sufficient ink supply, then ink availability improves, but ink distribution uniformity deteriorates
Solution Approach 1:
Instead of maintaining continuously thick ink layers, the system uses periodic contact where the film roller receives ink in controlled intervals. This allows sufficient total ink availability through repeated transfer cycles while maintaining thinner, more uniform ink layers during each contact phase, improving distribution uniformity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design maintains high printing speeds with reduced wear and improved ink distribution, achieving uniform ink films on the printing form regardless of low or high ink coverage.
Implementation Method 1
an ink duct roller (6) comprising an ink duct roller surface (7) which conveys the printing ink (4) out of the ink fountain (3) by a rotational movement about a longitudinal axis (8)
Data Source
Figure 1~2
Figure 3~4
Figure 5~8
AI summary
The invention relates to a film inking unit (2) for a printing unit (1) comprising an ink fountain (3) with a printing ink (4) contained therein, an ink duct roller (6) comprising an ink duct roller surface (7), which conveys the printing ink (4) out of the ink fountain (3) by a rotational movement about a longitudinal axis (8), a plurality of ink knives (5) arranged in the extension of the longitudinal axis (8) of the ink duct roller (6), with which an ink layer thickness s present on the ink duct roller surface (7) can be adjusted between a minimum ink layer thickness smin and a maximum ink layer thickness smax, a rotatable film roller (9), wherein the film roller (9) has a minimum distance a from the ink duct roller (6), an ink take-up roller (10), wherein the ink take-up roller (10) is in contact with the film roller (9).The invention is therefore based on the object of creating a solution that combines the advantages of suitability for high printing speeds and low wear with suitability for very low ink removal. This object is achieved according to the invention in that, in the film inking unit (2), the film roller (9) can be cyclically pivoted to a distance A from the ink duct roller (6), wherein the distance A is greater than the minimum distance a.