Notched Rotating Wheel Control for Rotation Limits Beyond 360°
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing rotation limiting systems for machines with rotating wheels or gears are limited to less than 360° and require either software-based solutions that are unreliable in harsh environments or additional mechanical hardware, which increases complexity and cost.
Innovation Solution
A latching relay and additional direction switches are integrated with the rotating wheel or gear to provide rotation limiting across a range of values beyond 360 degrees without the need for software or cumbersome gearboxes, ensuring reliable operation even in harsh conditions by using high-reliability safety relays and housing the relays away from the machine.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If software-based solutions are used to count revolutions and trigger limit switches, then rotation control beyond 360° is achieved, but system reliability decreases in harsh environments due to electronics and programming requirements
Solution Approach 1:
The patent replaces software-based electronic counting systems with a purely mechanical solution. A notched wheel attached to the rotating component works with mechanical limit switches and latching relays to achieve rotation control beyond 360° without requiring electronics, computer hardware, or programming, thereby maintaining reliability in harsh environments while achieving the desired adaptability.
2Adaptability or versatility
If gearboxes are added to reduce range of motion below 360° so two limit switches can be used, then rotation limiting is achieved, but device complexity and mechanical complexity increase
Solution Approach 1:
The patent segments the rotation control function into discrete mechanical components: a notched wheel with specific notch positions, limit switches positioned at predetermined angles, and latching relays. This segmentation allows the system to control rotation beyond 360° without requiring a gearbox, thereby achieving the desired adaptability while reducing mechanical complexity.
Solution Approach 2:
The patent introduces a notched wheel as an intermediary mechanical element between the rotating component and the limit switches. This notched wheel translates rotational position into discrete mechanical engagements with the limit switches, enabling rotation control beyond 360° without the need for complex gear reduction mechanisms.
3Manufacturing precision
If limit switches are positioned to stop rotation at specific points, then rotation control is achieved, but the system cannot handle rotations beyond 360° with a single protrusion-switch engagement
Solution Approach 1:
The patent employs periodic action by placing multiple notches at specific angular intervals around the wheel's circumference. As the wheel rotates, each notch periodically engages with the limit switches in a predetermined sequence, enabling the system to control and limit rotation over angles greater than 360° while maintaining precise position control through the periodic mechanical engagements.
Solution Approach 2:
The patent implements preliminary action by pre-positioning multiple notches on the wheel at specific angular locations before operation. These pre-positioned notches work with the limit switches to predetermined rotation limits, allowing the system to control rotation beyond 360° without requiring real-time computational decision-making, thereby achieving both precision and extended range capability.
Data Source
AI summary
An apparatus and method for rotating a part includes a sequence of relays to rotate the part given number of degrees. The apparatus does not require software or complex mechanical gearing.