Unidirectional Or Bidirectional Rotary Drive
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Solution Overview
Problem
Existing manual cord-driven kitchen appliances for mixing or grinding lack the ability to seamlessly alternate between unidirectional and bidirectional rotation, necessitating either excessive force or inefficient torque and speed adjustments, which are wasteful and energy-consuming.
Innovation Solution
A rotary drive device with a coupling member that can transition between unidirectional and bidirectional rotation modes, utilizing a ratchet wheel for single-direction rotation and a dog clutch for two-directional rotation, along with two-stage gearing to modify torque and speed, and an actuator to facilitate this transition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a manual cord-driven device uses a fixed gear ratio, then the structure is simple, but the torque and speed cannot be adaptively adjusted to match varying material resistance
Solution Approach 1:
The patent implements a dynamic transmission system where the gear ratio can be changed during operation. The transmission mechanism includes at least two different gear ratios that can be switched based on the cutting process requirements. This allows the device to adapt torque and speed to match varying material resistance throughout the cutting process, resolving the contradiction between adaptability and complexity by providing a manageable two-speed system rather than a continuously variable complex mechanism.
Solution Approach 2:
The patent changes the transmission parameter (gear ratio) to optimize performance at different stages of the cutting process. By providing at least two different gear ratios, the system can switch between high torque/low speed for initial cutting of bulky food and low torque/high speed for mixing finer pieces, thereby adapting to varying material resistance without requiring an overly complex transmission system.
2Force
If the device provides high torque for cutting bulky food, then the cutting force is sufficient, but the rotation speed is reduced which is insufficient for mixing finer pieces
Solution Approach 1:
The transmission mechanism dynamically adjusts the gear ratio based on cutting stage requirements. During initial cutting of bulky food, the system engages a gear ratio that provides high torque for sufficient cutting force. When mixing finer pieces later in the process, the system switches to a different gear ratio that increases rotation speed while reducing torque, thereby resolving the contradiction between force and speed requirements at different operational stages.
Solution Approach 2:
The cutting process naturally progresses through different stages requiring different force-speed combinations. The patent implements periodic switching between gear ratios that matches this natural progression: high torque mode for the initial cutting phase, then transitioning to high speed mode for the mixing phase. This periodic adjustment of transmission parameters aligns with the periodic nature of the cutting process itself.
3Productivity
If the device allows bidirectional rotation for mixing, then the mixing efficiency is improved, but the mechanism for switching between unidirectional and bidirectional rotation adds complexity
Solution Approach 1:
The patent implements a dynamic rotation control system that can switch between unidirectional and bidirectional rotation modes based on the operational phase. The transmission mechanism includes components that enable the output shaft to rotate in one direction during cutting (unidirectional mode) and in both directions during mixing (bidirectional mode). This dynamic switching capability improves mixing efficiency while keeping the control mechanism manageable through integrated design of the transmission and rotation control components.
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 efficient mixing and grinding by allowing adaptive torque and speed adjustments based on the material's resistance, reducing user effort and preventing equipment damage, while promoting energy efficiency and versatility.
Implementation Method 1
a ratchet wheel for single-direction rotation
Implementation Method 2
a dog clutch for two-directional rotation
Implementation Method 3
two-stage gearing to modify torque and speed
Data Source
AI summary
A rotary drive device for a mixing or grinding cooking appliance includes (i) a rotary subassembly, (ii) a rotary drive member of a food processing arm and, (iii) a rotary coupling member of the rotary subassembly with the drive member for transmitting a rotational movement from the rotary subassembly the drive member. The coupling member is movable between a first position in which the coupling member is adapted to transmit motion in a single direction of rotation of the rotary subassembly and a second position in which the coupling member is adapted to transmit motion in two directions of rotation of the rotary subassembly.