Sheet-fed printing press roller diameter inversion for uniform detergent distribution
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Sheet-fed printing presses require rapid and uniform detergent distribution to minimize printing interruptions and detergent consumption during color changes, which existing technologies fail to achieve efficiently.
Innovation Solution
The design features a sheet-fed printing press with an anilox inking unit and a dampening unit, where the outside diameter of the inking roller is more than twice that of the dampening form roller, allowing for even detergent distribution through the use of a bridge roller and a jet or spray device targeting the dampening unit, ensuring effective washing with minimal interruptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the dampening form roller has a larger diameter, then the printing speed increases, but the detergent distribution becomes uneven and washing time increases
Solution Approach 1:
The patent inverts the conventional approach by making the inking roller significantly larger than the dampening form roller (ratio ≥ 2:1), rather than making them equal or the dampening roller larger. This inversion allows the dampening roller to complete multiple revolutions per inking roller revolution, ensuring thorough detergent distribution while maintaining high printing speeds
2Length of stationary object
If the dampening form roller has a larger diameter, then the circumferential length increases, but the detergent consumption increases and distribution becomes less uniform
Solution Approach 1:
The patent changes the critical parameter of roller diameter ratio to ≥ 2:1 (inking roller to dampening roller). This parameter change ensures that the dampening roller's smaller circumference allows it to rotate multiple times per inking roller revolution, creating numerous contact points for detergent application and ensuring uniform distribution with reduced detergent consumption
3Device complexity
If the roller diameters are equal, then the structure is simpler, but the detergent distribution is uneven and printing interruptions increase
Solution Approach 1:
The patent inverts the conventional equal-diameter configuration by making the inking roller at least twice as large as the dampening form roller. This inversion creates a mechanical advantage where the smaller dampening roller rotates multiple times per inking roller revolution, ensuring rapid and uniform detergent distribution that minimizes printing interruptions during color changes
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 configuration enables rapid and uniform detergent distribution across the anilox and dampening units, reducing printing interruptions and detergent consumption, while maintaining print quality by ensuring the detergent reaches all necessary areas effectively.
Implementation Method 1
a jet or spray device for introducing a detergent is directed onto the dampening unit
Implementation Method 2
a bridge roller rests against the dampening forme roller and the inking forme roller in a cleaning mode
Data Source
AI summary
The machine has an anilox inking system (4) with a thrust bearing (6) and a color order roller (7). A dampening device (5) comprises a damping roller (20). An outer diameter (D) of a color order roller is more than two times larger than an outer diameter (d1) of the damping roller. A bridge roller (22) is provided at the damping roller and at the color order roller in a cleaning mode.