Kitchen Appliance Rotary Knob Speed Detection for Emergency Shutdown
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Solution Overview
Problem
Conventional electrically operable kitchen appliances require an additional emergency stop switch for rapid shutdown, which is time-consuming, costly, and aesthetically undesirable, and existing solutions do not effectively differentiate between accidental and intentional adjustments using rotary knobs or push-buttons.
Innovation Solution
The rotary knob or push-button is designed to trigger shutdown based on the speed and force of its movement or rotation, combining adjustment and emergency deactivation functions, eliminating the need for a separate emergency stop switch by using detection devices to differentiate between conventional and emergency stop inputs, such as speed and force sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an additional emergency stop switch is fitted to enable rapid shutdown, then safety is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The rotary knob is designed to perform multiple functions: normal operation adjustment and emergency shutdown. By detecting the speed and direction of rotation, the system can differentiate between intentional adjustment and emergency stop commands, eliminating the need for a separate emergency stop switch while maintaining safety functionality
Solution Approach 2:
The emergency stop function is merged with the existing rotary knob control mechanism. The detection device monitors the rotary knob's movement characteristics (speed and direction) to trigger shutdown, combining the adjustment device and emergency stop function into a single integrated control element
2Reliability
If an additional emergency stop switch is fitted to enable rapid shutdown, then safety is improved, but manufacturing cost increases
Solution Approach 1:
The rotary knob serves dual purposes as both an adjustment mechanism and an emergency stop trigger. The detection device analyzes rotation characteristics to identify emergency stop intent, allowing the system to eliminate the need for additional hardware components, thereby reducing manufacturing costs while maintaining safety
Solution Approach 2:
The emergency stop functionality is extracted from a separate physical switch and integrated into the existing rotary knob operation. By using the detection device to interpret rotary knob movement patterns, the system removes the need for additional components, simplifying manufacturing and reducing costs
3Device complexity
If the rotary knob is used for both adjustment and emergency shutdown, then device complexity is reduced, but the difficulty of detecting and measuring input intent increases
Solution Approach 1:
The system uses parameter changes in the rotary knob's operation—specifically rotation speed and direction—to differentiate between normal adjustment and emergency stop commands. The detection device measures these physical parameters to determine user intent, resolving the ambiguity of multi-function control without increasing device 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
This solution allows for immediate and safe shutdown of the appliance without additional controls, enhancing safety and reducing the number of operating elements, while maintaining the functionality of the adjustment device for regular operation.
Implementation Method 1
the speed with which this adjustment is carried out in the axial direction, or alternatively in the direction of rotation, or in the opposite direction of rotation
Data Source
AI summary
The invention relates to an electrically operatable kitchen device for preparing food by means of one or more effective devices. An effective device can be activated and/or adjusted by a rotary knob and/or push button, and the kitchen device can be deactivated in terms of one or simultaneously more or all of the activated effective devices. The aim of the invention is to provide an electrically operatable kitchen device with an advantageously deactivatable effective device. According to the invention, this is achieved in that the deactivation of the effective device can be triggered depending on the speed at which the rotary knob is moved in the direction of the rotational axis of the rotary knob, in the rotational direction, or in the opposite rotational direction.