Roller Changer for Rotary Printing Press Flying Roll Change
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Solution Overview
Problem
Current roll changers for web-fed rotary printing presses are limited in their ability to perform automatic roll changes, especially when the press is in operation, and require additional mechanisms for stationary operation, which increases non-production times and complexity.
Innovation Solution
A roll changer with at least two support arms and a control device that allows for automatic flying and non-flying roll changes by positioning the support arms, rotating the rolls, and using a joining and cutting unit to attach and sever the web, enabling roll changes during ramp-up to printing speed without the need for creep operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the roll changer is designed for stationary operation only, then the structure becomes simpler, but the non-production time increases due to required press stoppage
Solution Approach 1:
The roll changer is designed with dynamic capabilities to operate during press motion. The support arms can rotate rolls at variable speeds, and the joining device can operate while the web is moving, allowing roll changes during ramp-up without requiring complete press stoppage, thus reducing non-production time while maintaining manageable structural complexity
2Productivity
If additional mechanisms are added for flying roll change capability, then the productivity improves, but the device complexity increases
Solution Approach 1:
The support arms are designed with dual functionality: they can hold and rotate rolls during press operation, and also position and secure rolls during stationary operation. The rotary drives on support arms enable both flying roll changes during ramp-up and traditional stationary roll changes, providing multi-functionality that improves productivity without requiring entirely separate mechanisms for each operation mode
3Loss of time
If the roll changer operates during ramp-up to printing speed, then the non-production time reduces, but the control complexity increases
Solution Approach 1:
The control system incorporates feedback mechanisms that monitor web speed, roll position, and joining device status. This feedback enables precise coordination of roll rotation speeds and joining operations during ramp-up, allowing the system to manage the increased control complexity through real-time adjustments and automated coordination of multiple moving components
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 solution reduces non-production times and simplifies the roll changer design by allowing roll changes during normal operation, eliminating the need for additional stationary operation mechanisms and enabling efficient web material supply without stopping the press.
Implementation Method 1
the joining point of the web of the loading roller is attached to the web of the working roller by means of the joining device
Data Source
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AI summary
The method involves providing a drawer roller on a support arm (10) of a roll changer (1) for bringing the rotary printing press from an operating speed to standstill, so that a web (3a) comes to the standstill. The web is located on a working roller (3) which is arranged on another support arm (20) of the roll changer. A joining device (30) of the roll changer is provided on a joint position (FP) on the web of the working roller.