Printing Roller Replacement Device for Flexographic Presses
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Solution Overview
Problem
Current printing roller replacement processes in in-line rotary flexographic machines are inefficient, leading to prolonged downtime and significant material wastage during job changes, with existing solutions being complex, bulky, and slow.
Innovation Solution
A device with a compact design featuring a work station, holding station, and removal station, utilizing displacement means with guides and actuating mechanisms to quickly swap printing rollers without stopping the machine, ensuring seamless operation and minimal material waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a gripping element is used to successively grip and move the printing roller through multiple stations, then the printing roller can be replaced, but the replacement process is slow and requires successive movements of the same gripping element
Solution Approach 1:
The device divides the roller replacement function into multiple independent gripping elements (first gripping element at holding station, second gripping element at work station) that operate simultaneously on different stations. This segmentation allows parallel operations where one gripper holds a new roller while another removes an used roller, eliminating the sequential movement bottleneck and reducing overall replacement time.
2Productivity
If a complex device with multiple successive movements is used for roller replacement, then the roller can be changed, but the device becomes constructionally complex and bulky
Solution Approach 1:
The device is segmented into independent functional stations (holding station, work station, removal station) with dedicated gripping elements for each station. Each gripping element operates independently within its station, simplifying the overall control system and reducing mechanical complexity compared to a single multi-functional gripping mechanism that would require complex coordination.
Solution Approach 2:
The holding station prepares new printing rollers in advance by mounting them on spindles and positioning them ready for transfer. This preliminary action allows the work station to immediately exchange rollers without waiting for preparation, reducing replacement time while keeping each station's mechanism simple and focused on its specific function.
3Productivity
If traditional roller replacement is performed, then the printing roller can be changed, but the printing process must be substantially interrupted causing downtime
Solution Approach 1:
The device enables continuous printing operation during roller replacement by using multiple gripping elements that operate in parallel at different stations. While the work station performs the actual roller exchange on the printing unit, the holding station simultaneously prepares the next roller and the removal station handles the used roller, ensuring the printing process experiences minimal or no interruption.
4Productivity
If job change-over is performed with traditional methods, then the printing roller can be changed for a new job, but a huge amount of material is wasted
Solution Approach 1:
The holding station pre-mounts new printing rollers on spindles and positions them ready for immediate transfer to the work station. This preliminary preparation allows the printing process to continue uninterrupted during the actual roller exchange, eliminating the need to stop the machine and waste printing material that would otherwise be produced during shutdown and restart periods.
Data Source
AI summary
The present invention relates to a device for replacing the printing roller in a printing unit, in particular for in line rotary flexographic machines.