Magnetic Field Operator Positioning for Machine Safety
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Solution Overview
Problem
Existing safety mechanisms for preventing machinery-related injuries are often cumbersome, expensive, unreliable, and provide a false sense of security, as they typically require operator contact with a danger point before stopping the machine, which can lead to additional hazards.
Innovation Solution
A system comprising a transmitter mounted on a machine, a sensor attached to the operator or their clothing, and a tracking device that determines the operator's position relative to danger and warning zones, sending signals to the machine to slow down or stop operations before contact with a danger point is made, using a combination of magnetic fields and processors to manage zone definitions and actuator control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional safety mechanisms are used to prevent machinery injuries, then operator protection is provided, but the devices become cumbersome, expensive, and unreliable
Solution Approach 1:
The patent replaces complex mechanical safety devices with a magnetic field-based detection system. A transmitter mounted on the machine generates magnetic fields, and a sensor worn by the operator detects these fields to determine proximity to danger zones. This substitution of mechanical systems with electromagnetic fields eliminates the need for cumbersome physical barriers and complex mechanical interlocks, achieving reliable safety protection with a simpler, more elegant system.
2Reliability
If safety devices stop the machine only after operator contact with danger point, then the machine stops when injury occurs, but the operator receives false sense of security and additional hazards are created
Solution Approach 1:
The patent implements preliminary action by detecting the operator's proximity to danger zones before contact occurs. The magnetic field sensor continuously monitors the operator's position and triggers warnings or machine shutdowns in advance of actual contact with moving parts. This preliminary detection and response mechanism eliminates the false sense of security provided by post-contact stopping, as the system now prevents injuries by acting before the dangerous contact happens.
3Measurement precision
If a tracking system monitors operator position continuously, then danger zones are detected early, but the system complexity and cost increase
Solution Approach 1:
The patent uses magnetic field-based position detection instead of complex mechanical tracking systems. The transmitter on the machine creates magnetic field zones corresponding to different risk levels (warning zone, danger zone), and the sensor on the operator's body detects field strength to determine position. This electromagnetic approach provides continuous, precise position monitoring with far simpler hardware than mechanical tracking systems, achieving high measurement precision without excessive complexity.
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
Effectively prevents machinery operation when an individual enters a danger zone by providing timely warnings and gradually shutting down the machine, enhancing operator safety without the need for cumbersome equipment and reducing the risk of injury.
Implementation Method 1
A skinning machine has a transmitter mounted to its frame that establishes a reference point. A sensor worn by an operator detects the magnetic field generated by the transmitter to determine proximity to danger zones.
Data Source
AI summary
A method and means for controlling the operation of a machine by an operator having a transmitter mounted to a machine, a sensor attached to an operator or an operator's clothing, and a tracking device that receives signals from the sensor and determines the position of the sensor. Based on the determined position of the sensor, the tracking device sends signals to the operator and an actuator on the machine based on a comparison with a danger zone, warning zone, or operator zone.