Skinning Machine Blade Retraction With Optical Hand Detection
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Solution Overview
Problem
Existing skinning machines lack effective mechanisms for early warning and rapid blade retraction to prevent operator hand injuries, with conventional contact sensing being inadequate and blade retraction mechanisms insufficiently powerful.
Innovation Solution
The implementation of a proximity sensing device using optical surveillance to detect unsafe hand proximity to the blade, coupled with a rapid blade retraction mechanism powered by an internal energy storage and release device, such as a compression spring, to move the blade from the Run Position to a Safe Position within 20-35 milliseconds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If contact sensing is used to detect operator's hand proximity to the blade, then the sensing reliability is improved, but the response time is too long (1 millisecond roller stopping time is required but not achievable)
Solution Approach 1:
The patent applies preliminary action by using optical sensors to detect the operator's hand before it reaches the dangerous contact zone. The system performs the safety check in advance, allowing the blade retraction mechanism to activate before contact occurs, thus eliminating the need for extremely fast roller stopping while maintaining protection reliability.
Solution Approach 2:
The patent replaces the mechanical contact sensing system with an optical sensing system. This substitution allows for earlier detection of hand proximity without relying on physical contact, thereby providing sufficient warning time for blade retraction without requiring the roller to stop within an unachievable 1 millisecond.
2Reliability
If the blade retraction mechanism is designed to move the blade rapidly to a safe position, then the safety effectiveness is improved, but the power requirement and mechanical complexity increase
Solution Approach 1:
The blade retraction mechanism uses periodic action through a reciprocating motion system. The blade is rapidly retracted to the safe position when danger is detected, then returned to the working position when safe. This periodic motion allows the use of moderate power actuators that can achieve the required speed through optimized motion cycles rather than requiring continuously high power.
Solution Approach 2:
The patent applies dynamics by using a movable blade support that can transition between fixed working position and retracted safe position. The dynamic design allows the retraction mechanism to achieve high speed movement only when needed, while maintaining structural stability during normal operation, thereby reducing the average power requirement while maintaining safety effectiveness.
3Reliability
If the gripping roller is designed to stop rapidly to prevent hand dragging to the blade, then the safety response is improved, but the mechanical stress and wear on the roller system increase
Solution Approach 1:
The rapid roller stopping is triggered by preliminary optical detection of hand proximity. Because the detection occurs before contact, the roller has sufficient time to decelerate gradually using controlled braking rather than requiring abrupt mechanical stopping, thereby maintaining safety response while reducing mechanical stress and wear on the roller system.
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
This solution effectively prevents operator hand injuries by rapidly retracting the blade upon detection of unsafe hand proximity, ensuring a safe working environment and reducing the risk of post-contact damage.
Implementation Method 1
an internal energy storage and release device, such as a compression spring, to move the blade from the Run Position to a Safe Position within 20-35 milliseconds
Data Source
AI summary
A shaping or cutting machine, especially a skinner, at which an operator hand-feeds material to be cut or shaped toward a blade. Hand proximity detection devices are provided for operator safety; machine-vision across a surveilled volume before the blade, and conduction sensing devices. The blade is mounted on a rapidly retractable frame. Power from release of a spring physically moves the blade to a safe position if a hand is sensed. A gripping roller is driven by a rapidly stoppable motor.