Magnetic Clamping Motion for Rapid Machine Tool Retraction
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Solution Overview
Problem
Machine tools, such as circular saws, pose a risk of injury due to the inherent danger of rotating tools, and existing safety systems often fail to effectively isolate the user from the tool, leading to accidents despite the presence of protective arrangements.
Innovation Solution
A safety system for machine tools that utilizes a clamping device and a motion device driven by magnetic forces to move the tool from a working position to a safety position, where the tool is protected from user contact, employing at least two magnetically interacting means to facilitate rapid and safe repositioning without mechanical wear or damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If magnetic means are used to move the tool from working position to safety position, then the speed of tool repositioning is improved and user safety is enhanced, but the device complexity increases due to the addition of magnetic means
Solution Approach 1:
The patent replaces traditional mechanical actuation systems (motors, gears, linkages) with a magnetic field-based system. Magnetic means generate magnetic forces that directly act on the tool or clamping device to move it between working and safety positions, eliminating complex mechanical transmission components and achieving faster, more reliable repositioning.
Solution Approach 2:
The patent utilizes changes in magnetic field parameters (strength, direction, polarity) to control the movement of the tool. By varying the magnetic field parameters, the system can rapidly transition the tool between positions without mechanical wear or lag, achieving high-speed repositioning through field parameter modulation rather than mechanical actuation.
2Reliability
If magnetic means are used to move the tool, then the reliability of safety system operation is improved with no mechanical wear, but the use of energy increases due to continuous magnetic field maintenance
Solution Approach 1:
The magnetic means operate in periodic cycles rather than continuously. Magnetic fields are activated only when position transitions are required (from working to safety position or vice versa), and deactivated when the tool remains stationary. This periodic operation maintains reliability by ensuring magnetic forces are available when needed while significantly reducing overall energy consumption compared to continuous field maintenance.
Solution Approach 2:
The patent extracts the magnetic field generation function from continuous operation and applies it only during critical transition phases. By separating the magnetic actuation function from continuous positioning, the system achieves high reliability during safety-critical movements while minimizing energy consumption during normal operating states where mechanical holding or gravity may suffice.
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 magnetic safety system effectively reduces the risk of injury by rapidly and reliably moving the tool into a safe position, minimizing latency and avoiding false triggers, thus enhancing user safety during machine tool operation.
Implementation Method 1
the movement of the tool by the motion device out of the working position into the safety position can be triggered and/or at least partially implemented by means of magnetic force
Data Source
AI summary
A safety system is provided for a machine tool which has a frame and a tool. The safety system has a clamping device and a motion device. The clamping device is movable by the motion device from a working position, in which the tool is extended and can be used for working, to a safety position, in which the tool is retracted. The motion device has a first magnetic means connected to or arranged on the tool and a second magnetic means connected to or arranged on the frame, such that movement of the tool by the motion device from the working position to the safety position can be triggered and/or at least partially performed by magnetic force.