Impression Cylinder Sleeve Charging via Segmented Core
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Solution Overview
Problem
Conventional multi-part impression rollers with electrostatically charged sleeves require complex insulating bearings to prevent charge flow, making them difficult to maintain and challenging to comply with stringent explosion protection regulations.
Innovation Solution
An impression roller design featuring a roller core with an electrical contact point and power supply, where the sleeve's conductive or semiconductive layer is insulated from the core, allowing for electrostatic charging without charging the roller core, thus simplifying the bearing design and meeting stricter safety regulations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the sleeve is electrostatically charged via the roller core, then improved print quality is achieved, but complex insulating bearings are required to prevent charge flow
Solution Approach 1:
The roller core is segmented into a charged region (with electrical contact point and power supply) and an uncharged region (bearing shaft area). The conductive/semiconductive area on the sleeve contacts only the charged region, allowing the bearing shaft to remain uncharged and use simple bearings without complex insulation.
Solution Approach 2:
Only a specific local area of the roller core (the conductive/semiconductive area) is charged, while the bearing shaft region remains uncharged. This localized charging approach maintains print quality improvement while avoiding the need for complex insulating bearings throughout the entire roller core.
2Manufacturing precision
If the entire roller core is charged, then the sleeve can be electrostatically charged, but explosion protection regulations become difficult to meet
Solution Approach 1:
The roller core is divided into a charged segment (for print quality) and an uncharged segment (bearing shaft for safety). This segmentation limits the charged area to only where necessary, reducing overall explosion risk while maintaining printing performance.
Solution Approach 2:
Charging is applied locally only to the conductive/semiconductive area that contacts the sleeve, while the bearing shaft region remains uncharged. This localized approach achieves the necessary print quality without creating explosion hazards throughout the entire roller core.
3Reliability
If complex insulating bearings are used, then charge flow is prevented, but maintenance costs and complexity increase
Solution Approach 1:
By segmenting the roller core into charged and uncharged regions, the bearing shaft can use simple, easy-to-maintain bearings. The sleeve can still be charged through the conductive/semiconductive area without requiring complex insulation on the bearings, thus reducing maintenance complexity.
4Manufacturing precision
If the roller core is charged, then the sleeve can be charged, but the bearing shaft becomes complicated with insulation requirements
Solution Approach 1:
The roller core is segmented so that only the necessary conductive/semiconductive area is charged, while the bearing shaft region remains uncharged. This allows the bearing shaft to be simple and easy to manufacture, while still achieving the required electrostatic charging capability for the sleeve.
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 prevents the roller core from being charged, allowing for uncomplicated bearing insulation and easier compliance with explosion protection regulations, enhancing maintenance efficiency and cost-effectiveness.
Implementation Method 1
A conductive or semiconductive area of the pushed-on sleeve rests against the electrical contact point. The electrical contact point and the power supply are electrically insulated from the rest of the roller core that has the bearing shaft, so that the rest of the roller core is not charged during operation.
Implementation Method 2
The electrical contact point and the power supply are electrically insulated from the rest of the roller core that has the bearing shaft, so that the rest of the roller core is not charged during operation.
Data Source
Figure 1~2
Figure 3~5
Figure 6~7
AI summary
An impression cylinder (6) comprises a cylinder core (71) encompassing a bearing shaft (79), and a removable sleeve (63) that is slid onto the cylinder core (71). The cylinder core (71) has an electrical contact point in the form of a double-crimped metal ring (100) as well as a non-rotating brush (102) as a power supply. A conducting zone (631) of the slid-on sleeve (63) rests against the electrical contact point (100). The electrical contact point (100) and the power supply (102) are electrically insulated from the rest of the cylinder core (71) encompassing the bearing shaft (79) such that the rest of the cylinder core (71) is not charged during operation. The bearings (12) of the impression cylinder (6) therefore do not need to be electrically insulated with a lot of effort.