Roller Shutter Transition Guide Paths Eliminate Polygonal Effect
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Solution Overview
Problem
Conventional roller shutter arrangements experience oscillations and noise due to the 'polygonal effect' when moving at higher speeds, limiting maximum movement speed and reducing the service life of components.
Innovation Solution
The introduction of a transition portion with at least two guide paths for guide rollers, where adjacent rollers alternate paths, ensuring the effective guide length corresponds to the door leaf element's breadth or its integer multiple, thereby eliminating the polygonal effect and reducing oscillations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the door leaf is moved at higher speeds, then productivity is improved, but oscillations and noise occur due to the polygonal effect
Solution Approach 1:
The transition portion is divided into multiple guide paths (at least two) instead of a single curved path. Each guide path has a length corresponding to the partition defined by door leaf element breadth or an integer multiple thereof. This segmentation allows guide rollers to follow discrete paths that eliminate the polygonal effect while maintaining smooth operation at higher speeds.
Solution Approach 2:
The solution transitions from a single curved guide path to multiple guide paths arranged in different spatial positions. The guide paths are staggered laterally, creating a multi-dimensional guide structure that allows the door leaf to transition smoothly while maintaining guide path lengths that correspond to door leaf element partitions, thereby eliminating oscillations.
2Device complexity
If conventional single guide path is used, then device complexity is low, but polygonal effect causes wear and reduces service life
Solution Approach 1:
The guide structure is segmented into multiple guide paths within the transition portion. Each path is designed with specific length characteristics that correspond to door leaf element partitions. This segmentation eliminates the polygonal effect, reducing wear on guide rollers and door leaf components, thereby extending service life without requiring overly complex external mechanisms.
Solution Approach 2:
The multiple guide paths serve multiple functions simultaneously: they guide the door leaf through the transition portion, eliminate the polygonal effect, and provide smooth operation at higher speeds. The guide paths are integrated into the existing lateral guides, making the solution space-efficient while achieving multiple objectives.
3Ease of operation
If transition portion with curved path is used, then door leaf can move between positions, but guide path length does not correspond to door leaf element partition causing oscillations
Solution Approach 1:
The guide paths in the transition portion are designed with specific local characteristics: their lengths correspond to the partition defined by door leaf element breadth or integer multiples thereof. This local adaptation of guide path dimensions to the door leaf element geometry ensures that guide rollers follow paths that match the door leaf structure, eliminating oscillations and ensuring smooth movement.
Solution Approach 2:
The guide path length parameter is specifically adjusted to correspond to the door leaf element partition or its integer multiples. This parameter change transforms the guide path from a generic curved transition to a precisely dimensioned path that eliminates the polygonal effect, thereby stabilizing the door leaf movement and eliminating oscillations.
Data Source
AI summary
A roller shutter arrangement (1) includes a door leaf (2) including door leaf elements connected together to be angled and guided by guide rollers (23a, 23b) in lateral guides. The lateral guides each include an end portion accommodating the door leaf (2) in a closed position and a storage portion accommodating the door leaf (2) in an open position. The end portion and the storage portion are angled with respect to each other and are connected via a transition portion (42). The transition portion (42) includes guide paths on guide rollers on which predetermined guide rollers roll with a guide length between guide rollers corresponding substantially to a partition defined by a breadth of the door leaf element or to an integer multiple thereof. The so-called polygonal effect is avoided and higher movement speeds of the door leaf (2) are enabled while the service life is simultaneously increased.