Sheet-Processing Cylinder With Adjustable Vacuum Phase for Precise Transfer
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Solution Overview
Problem
Existing sheet-processing machines face challenges in precisely and securely transporting sheets without uncontrolled movements, particularly during the transfer between conveying means, and require complex adjustments and retrofitting mechanisms for optimal sheet treatment.
Innovation Solution
A cylinder with adjustable rotary unions that allow for varying the size and position of the active rotation angle phase, combined with suction openings and magnetic elements, ensures precise sheet transport and secure holding, eliminating the need for complex adjustments and enabling modular retrofitting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing sheet-processing machines use conventional conveying means, then sheet transport can be performed, but precise and secure transport without uncontrolled movements cannot be achieved
Solution Approach 1:
The patent employs suction openings connected to a vacuum source that creates a vacuum field during a defined rotation angle phase. This pneumatic field securely holds the sheet on the cylinder surface, preventing uncontrolled movements and ensuring precise transport. The vacuum field is activated only during the necessary rotation phase, providing reliable sheet holding while maintaining transport precision.
Solution Approach 2:
The patent uses a rotatable cylinder with a defined rotation angle phase that can be adjusted dynamically. The suction openings are activated during this dynamic rotation phase, allowing the system to adapt to different sheet sizes and transport requirements. This dynamic approach enables precise sheet transport while maintaining operational flexibility.
2Manufacturing precision
If complex adjustments and retrofitting mechanisms are used, then optimal sheet treatment can be achieved, but device complexity increases
Solution Approach 1:
The cylinder design integrates multiple functions into a single component: it provides mechanical support, contains suction openings for vacuum holding, and enables adjustable rotation angle phases. This multi-functional design achieves optimal sheet treatment without requiring separate complex adjustment mechanisms or retrofitting components, thereby reducing overall device complexity while maintaining treatment accuracy.
Solution Approach 2:
The patent combines the suction openings, rotation mechanism, and sheet holding function into an integrated cylinder assembly. By merging these previously separate functions into one unified system, the patent achieves precise sheet treatment without the need for complex separate adjustment mechanisms or retrofitting, thus reducing device complexity.
3Reliability
If suction air is applied continuously, then sheet holding is maintained, but energy consumption increases
Solution Approach 1:
The vacuum field is activated periodically during a defined rotation angle phase rather than continuously. The suction openings receive vacuum pressure only during the specific rotation phase when sheet holding is required, and are closed during other phases. This periodic operation maintains reliable sheet holding security while significantly reducing energy consumption compared to continuous vacuum application.
Solution Approach 2:
The system dynamically controls the vacuum activation based on the rotation angle phase. The suction openings are connected to the vacuum source only during the necessary rotation phase, allowing the system to adapt energy consumption to actual operational needs while maintaining secure sheet holding during critical phases.
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
The solution enables precise and secure sheet transport, optimizing the takeover and transfer processes, particularly in producing optically variable image elements, with improved accuracy and adjustability, and allows for modular integration with existing systems.
Implementation Method 1
a vacuum pressure can be applied via the rotary union to suction openings or groups of suction openings provided around the circumference of the cylinder while an active rotation angle phase of the cylinder about the axis of rotation thereof is being run through
Data Source
AI summary
Examples include a cylinder having a holding means around the circumference and by which a substrate sheet can be picked up and held during rotation of the cylinder over a rotation angle range between when the substrate sheet is received and is transferred downstream. A rotary union includes a rotor rotating along with the cylinder which, at an end face, is arranged with a stator that does not rotate during regular operation. A vacuum pressure can be applied via the rotary union to suction openings provided around the circumference of the cylinder while running through an active rotation angle phase of the cylinder. The rotary union can be set in terms of a size of a passage angle sector determining the size of the active rotation angle phase and/or in terms of a position of the passage angle sector determining the position of the active rotation angle phase.