Hand Blender Position Control for Continuous Safe Operation
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Solution Overview
Problem
Hand-held kitchen appliances with rotating tools often experience undesired interruptions in operation due to brief deviations from the detected sensor positions, leading to annoying and quality-impacting discontinuous use.
Innovation Solution
A hand-held kitchen appliance with a control device that evaluates a position signal over time to determine permissible operating positions, allowing continuous operation by reducing engine output during incorrect handling and quickly resuming normal operation when the device returns to a safe position, using an electronic position sensor and timer for precise control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional sensors are used to prevent unintentional startup, then safety is improved, but device complexity increases
Solution Approach 1:
The control device is designed to perform multiple functions: it controls the drive motor, evaluates position signals from the sensor, determines permissible operating positions through time-controlled evaluation, and interrupts operation when necessary. By making the control device universal and multi-functional, the patent avoids adding separate dedicated safety systems, thereby improving safety without proportionally increasing device complexity
Solution Approach 2:
The system uses the existing position sensor (originally intended for basic position detection) to also serve safety functions through the control device's time-controlled evaluation. The control device leverages the position signal for both operational control and safety monitoring, making the system self-sufficient and avoiding the need for additional dedicated safety sensors
2Reliability
If strict position monitoring is implemented, then safety is improved, but operational continuity deteriorates
Solution Approach 1:
The control device dynamically adjusts its response based on the duration and nature of position deviations. Instead of a static on/off response, it performs time-controlled evaluation to determine whether a position change represents a temporary adjustment or a genuine safety issue requiring interruption. This dynamic approach maintains safety while allowing operational flexibility and continuity
Solution Approach 2:
The system changes the evaluation parameter from a simple binary position check to a time-controlled evaluation that considers the duration of position deviations. By introducing time as a variable parameter, the system can distinguish between brief operational adjustments and sustained unsafe positions, thereby maintaining both safety and operational continuity
Data Source
Figure 1
Figure 2
AI summary
The apparatus has a control device (11) formed to determine a time-controlled allowable operating position on basis of an electronic position signal (12) during negative detection of an operating interrupt of the apparatus. The control device evaluates the position signal by a timer. The apparatus is displaceable into a standby mode by an activating unit e.g. safety switch. Drivable machining tools e.g. knives, are rotatably driven, and the control device is arranged to adjust preset rotational speed of the rotatably drivable machining tools as function of the position signal.