Rotary Pitting Knife Drive to Reduce Cam Friction and Wear
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Solution Overview
Problem
Conventional fruit pitting systems using box cams or open cams face issues such as increased friction, wear, loud operation, and short part life due to sliding and reciprocating motion, which lead to inefficiencies and contamination of the final product.
Innovation Solution
A pitting knife assembly with a pulley drive system that moves the knives in a smooth sinusoidal motion around a circular path, reducing the number of parts and eliminating sliding friction, while the fruit holders are synchronized with the knife motion to ensure efficient pit removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If box cam or open cam mechanisms are used to drive pitting knives in reciprocating motion, then the knives can be moved into and out of engagement with fruit, but friction and wear increase significantly
Solution Approach 1:
The patent replaces the traditional cam-follower mechanical system with a belt-driven pulley system. The pitting knives are mounted on a movable carriage that is driven by a belt connected to pulleys, eliminating the sliding friction and reciprocating motion inherent in cam mechanisms. This substitution of mechanical systems reduces wear and friction while maintaining the required knife engagement and disengagement functionality.
2Ease of operation
If cam mechanisms with sliding motion are used, then knife reciprocating motion is achieved, but operation becomes loud and part life shortens
Solution Approach 1:
The patent eliminates the noisy sliding motion of cam mechanisms by replacing it with a belt-driven system. The pulley and belt arrangement provides smooth, quiet operation while still achieving the necessary reciprocating motion of the pitting knives. The belt drive system generates minimal noise compared to the high-friction sliding contact in cam mechanisms, and the reduced wear extends the life of moving parts.
3Adaptability or versatility
If conventional cam systems are used, then fruit pitting function is achieved, but device complexity and part count increase
Solution Approach 1:
The patent merges multiple functions into a simplified belt-driven pulley system. Instead of separate cam mechanisms for each knife, the system uses a single belt connected to pulleys that coordinates the motion of multiple pitting knives simultaneously. This consolidation reduces the total number of parts while maintaining the adaptability and functionality required for effective fruit pitting.
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
The solution reduces part count and friction, leading to a quieter, more efficient, and longer-lasting pitting process with improved fruit handling and reduced contamination, resulting in cost savings and enhanced product quality.
Implementation Method 1
The pulley drive assembly is configured to translate a belt as the pulleys rotate
Data Source
AI summary
A pitting knife assembly including a pitting knife mount and a pulley drive assembly coupled and configured to move the knife mount around a circular or substantially circular path, and a fruit pitting apparatus including such an assembly. During operation of the pitting knife assembly with at least one pitting knife mounted to the knife mount and a fruit conveying assembly positioned to convey fruit to the pitting knife assembly, the pitting knife can produce pitted fruit by moving into engagement with fruit conveyed by the conveying assembly (to pit the fruit) as the knife mount moves through a first portion of the path, and the pitting knife can then move out of engagement with (and away from) the pitted fruit as the knife mount moves through a second portion of the path.