Analog Oven Clock With Stepping Motor for Delayed Cooking
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Solution Overview
Problem
Traditional oven timers with analog clocks lack delayed programming functionality, have limited time resolution, and high energy consumption, which negatively impacts aesthetics and user experience, especially in 'old style' kitchens where digital clocks are not preferred.
Innovation Solution
An analog clock for ovens with a stepping motor-driven hour and minute hand system, integrated microcontroller, and energy-saving power supply, allowing for intuitive programming of cooking cycles with 1-minute resolution and low standby energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If an analog clock with hands is used to maintain classic aesthetics, then aesthetic appearance is improved, but delayed programming functionality and time resolution are lost
Solution Approach 1:
The clock face is segmented into different functional zones: standard hour/minute markings for time display, and programmable hour/minute zones for setting delayed cooking functions. The hands themselves are segmented in function - their positions can indicate both current time and programmed times depending on mode. This segmentation allows the same physical display to serve multiple purposes without adding digital elements.
Solution Approach 2:
The analog clock hands serve multiple functions: indicating current time, displaying programmed start time, displaying programmed duration, and showing alarm settings. The same mechanical hands that provide classic aesthetic appeal are made multi-functional through the control system's ability to interpret their positions differently based on operational mode, eliminating the need for separate digital displays or additional hands.
2Shape
If traditional analog clock hands are used, then classic aesthetic is maintained, but time resolution for programming is limited
Solution Approach 1:
The continuous mechanical rotation of analog hands is supplemented with discrete electronic positioning control. The microcontroller drives the hands to precise angular positions corresponding to exact minute intervals (1-minute resolution) rather than relying solely on continuous mechanical movement. This hybrid approach maintains the visual aesthetic of analog hands while achieving digital-level programming precision.
3Adaptability or versatility
If additional hands are added to enable delayed programming, then programming functionality is improved, but device complexity and energy consumption increase
Solution Approach 1:
The existing two hands (hour and minute) are made multi-functional through software control. The microcontroller interprets hand positions differently based on operational mode - sometimes indicating current time, sometimes indicating programmed start time, sometimes duration. This eliminates the need for additional hands while providing full delayed programming functionality, reducing mechanical complexity while maintaining versatility.
Solution Approach 2:
The functional interpretation of the hands is dynamic rather than static. The same physical hand configuration can represent different meanings depending on the clock's operational state. The system dynamically switches between displaying current time and displaying programmed parameters using the same hands, avoiding the need for additional permanent display elements.
4Measurement precision
If continuous power is supplied to maintain hand positions for programming, then programming accuracy is improved, but energy consumption in standby mode increases
Solution Approach 1:
Instead of continuous power supply to maintain hand positions, the system uses periodic updates. The microcontroller updates the hand positions only when programming mode is active or when time needs to be displayed. During standby, the hands remain in their last known positions without active power maintenance, significantly reducing energy consumption while preserving programming information in memory.
Solution Approach 2:
The system uses the existing mechanical inertia and position of the hands combined with memory storage to maintain programming information without continuous power. The hands serve themselves by remaining in position through mechanical stability, while the microcontroller memory independently preserves the programmed data, eliminating the need for continuous electrical power to maintain both visual and data state.
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
Enables intuitive delayed cooking programming with 1-minute resolution and significantly reduces energy consumption during standby mode while maintaining a classic aesthetic, enhancing user experience and compliance with energy efficiency standards.
Implementation Method 1
The hands (L1, L2) are rotated by a stepping motor (M)
Data Source
Figure 1~2
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AI summary
A clock (1) for household appliance is disclosed, comprising: hands (L1, L2) to tell the time, a stepping motor (M) to actuate said hands, icons (I1-I5) to indicate clock functions, a switch (SW) to control the switch-on/off of the appliance according to a time period set by the user, a microcontroller (MC) connected to the stepping motor (M), icons (I1-I5) and switch (SW) to control the operation of these devices, buttons (T1, T2, T3) connected to the microcontroller (MC) and actuated by the user to select and control the clock functions, and a power supply (A) connected to the mains to power said microcontroller (MC).