Motorized Turn-Bar for Web Orientation Adjustment
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Solution Overview
Problem
In web press systems, switching between double-sided and single-sided printing modes requires cutting, rethreading, and splicing the web, which is time-consuming and can lead to web damage.
Innovation Solution
The use of motorized turn-bar mechanisms with swivelable roll bars allows for automatic adjustment of web orientation without cutting, rethreading, or splicing, enabling seamless switching between printing modes by altering the path of the web through the turn-bar.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If manual cutting, rethreading, and splicing is used to switch between printing modes, then the web can be reconfigured for different printing needs, but the process is time-consuming and increases the risk of web damage
Solution Approach 1:
The turn-bar mechanism is made dynamically adjustable, allowing it to switch between different orientations (inverting vs. non-inverting) during operation. This dynamic capability enables the system to adapt between single-sided and double-sided printing modes without manual intervention, resolving the contradiction by making the configuration change rapid and automated rather than manual and time-consuming
Solution Approach 2:
The turn-bar mechanism is designed to perform multiple functions: it can operate in an inverting mode for double-sided printing and in a non-inverting mode for single-sided printing. This multi-functionality allows a single mechanism to handle different printing requirements, eliminating the need for separate configurations and enabling quick switching between modes without web damage or downtime
2Adaptability or versatility
If manual cutting, rethreading, and splicing is used to switch between printing modes, then the web can be reconfigured for different printing needs, but the risk of web damage increases due to splice creation
Solution Approach 1:
The dynamic adjustability of the turn-bar allows mode switching without physical manipulation of the web. The mechanism changes its operational state through motorized adjustment rather than manual web handling, eliminating cutting and splicing operations that compromise web integrity, thus maintaining reliability while achieving adaptability
Solution Approach 2:
The motorized turn-bar mechanism acts as an intermediary that enables mode switching through automated mechanical adjustment rather than direct manual web manipulation. This intermediary mechanism transfers the control from operator hands to an automated system, preventing direct contact-based damage to the web while achieving the desired configuration changes
3Adaptability or versatility
If manual rethreading is used to switch between printing modes, then the web path can be changed, but operator intervention is required which reduces efficiency
Solution Approach 1:
The turn-bar mechanism is equipped with motorized actuation that enables it to reconfigure itself automatically without operator intervention. The system serves itself by using automated motors to adjust the bar orientation based on the desired printing mode, eliminating the need for manual rethreading operations and thereby maintaining high productivity while achieving mode adaptability
4Adaptability or versatility
If a fixed turn-bar configuration is used, then the mechanism is simple, but it cannot switch between inverting and non-inverting modes
Solution Approach 1:
The turn-bar mechanism incorporates dynamic elements (motorized actuation, adjustable orientations) that enable it to switch between inverting and non-inverting modes. While this increases complexity compared to a fixed bar, the complexity is justified and managed by the automated control system, achieving adaptability without requiring multiple separate fixed mechanisms
Data Source
AI summary
A turn-bar for adjusting orientation of a web includes a plurality of roll bars. Positions of at least two bars of the plurality of roll bars are movable with respect to a direction of travel of the web. An orientation of the web passing through the bars may be changed by adjusting a position of the at least two bars without removal of the web from the turn-bar. A method of selectively inverting or not inverting a web includes changing a position of at least two roll bars of a turn-bar apparatus with respect to a direction of travel of the web, where the web is not inverted by the turn-bar apparatus when the at least two roll bars are in a first position, and the web is inverted by the turn-bar apparatus when the at least two roll bars are in a second position.