Asymmetrical Elliptical Trajectory Paper Roll Cutting
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Solution Overview
Problem
Existing paper roll cutting devices require large disc-shaped blades to cut rolls on multiple parallel channels, which is inefficient and not adaptable to varying roll sizes, and typically use a circular trajectory that does not optimize cutting precision.
Innovation Solution
A paper roll cutting device with a rotating motorized arm and cutting blade that moves in an asymmetrical elliptical trajectory, allowing the blade to travel closer to the cutting area and reducing its diameter, enabling efficient cutting of rolls on multiple channels while making the blade follow an almost straight path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a large disc-shaped blade is used to cut rolls on multiple parallel channels, then the cutting coverage is improved, but the device complexity and blade size increase
Solution Approach 1:
The patent divides the cutting function into multiple smaller blades (first cutting blade and second cutting blade) positioned at different angular locations on the rotating arm. Each blade serves a specific channel, eliminating the need for one large blade to cover all channels simultaneously.
Solution Approach 2:
The patent transitions from a single large blade operating in one plane to multiple smaller blades distributed in three-dimensional space around the rotating arm. The blades are positioned at different angles and heights, utilizing spatial dimensionality to achieve multi-channel cutting coverage.
2Ease of operation
If a circular trajectory is used for the cutting blade, then the motion path is simple, but the cutting precision is reduced
Solution Approach 1:
The patent employs a mechanism that dynamically adjusts the blade's trajectory from a simple circular path to an asymmetrical elliptical path. The trajectory varies during the rotation cycle, providing optimal cutting geometry at different phases while maintaining continuous motion.
Solution Approach 2:
The patent changes the trajectory parameters by introducing asymmetry into the elliptical path. The distance between the rotation axis and cutting blade varies cyclically, with minimum distance at the lower point of the trajectory, optimizing the cutting angle and precision without requiring complex mechanical adjustments.
3Adaptability or versatility
If the blade diameter is reduced for better adaptability, then the adaptability to different roll sizes is improved, but the cutting capability on multiple channels is reduced
Solution Approach 1:
The patent segments the cutting coverage across multiple smaller blades positioned at different angular locations. Each smaller blade can adapt to different roll sizes independently, while the combination of multiple blades maintains comprehensive channel coverage.
Solution Approach 2:
The rotating arm structure with multiple blades serves multiple functions simultaneously: each blade can cut rolls of different sizes, and the collective arrangement covers multiple channels. The system achieves versatility through the coordinated action of multiple smaller cutting elements.
Data Source
AI summary
A paper roll cutting device comprises a rotating motorized arm (20), provided with a rotation axis (21) fixed in the space, and at least one cutting blade (30) to cut at least a paper stick (100) obtaining said paper rolls connected to the rotating motorized arm (20), wherein the rotation axis (31) of the cutting blade (30) is cyclically movable during the rotation of the motorized arm (20), the distance between the rotation axis (21) of the rotating arm (20) and the rotation axis (31) of the cutting blade (30) being progressively cyclically variable during the rotation of the motorized arm (20) with a minimum distance at the lower point of the rotation trajectory of the cutting blade (30).