Coffee Grinder Eccentric Shaft Adjustment for Precise Grind Control
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Solution Overview
Problem
Existing automatic coffee grinders lack the ability to accurately and consistently set the degree of grinding, leading to variable coffee quality and requiring manual, labor-intensive adjustments.
Innovation Solution
A motor-driven eccentric shaft is used to axially adjust one grinding disc relative to the other, allowing continuous regulation of the grinding degree, with an electric motor drive and cylindrical shaft parts for precise control and easy maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If manual adjustment of grinding disc distance is used, then device complexity is reduced, but manufacturing precision and reliability of grinding degree setting deteriorate
Solution Approach 1:
The patent replaces the manual mechanical adjustment system with an automated motor-driven eccentric shaft mechanism. The electric motor rotates the eccentric shaft, which through its offset geometry, automatically adjusts the axial distance between grinding discs with high precision, eliminating manual intervention while ensuring consistent grinding quality.
Solution Approach 2:
The patent changes the control parameter from manual position setting to motorized rotation control. By rotating the eccentric shaft through different angles, the system dynamically adjusts the grinding disc spacing parameter, enabling precise and repeatable grinding degree settings that were previously unachievable with manual adjustment.
2Device complexity
If manual adjustment of grinding disc distance is used, then device complexity is reduced, but ease of operation deteriorates
Solution Approach 1:
The system performs self-adjustment through the motor-driven eccentric shaft mechanism. The motor automatically rotates the eccentric shaft to the required position based on pre-programmed parameters or user input, eliminating the need for manual intervention. The holding torque feature further ensures the setting is maintained without continuous manual adjustment.
Solution Approach 2:
The system pre-sets the grinding parameters and automatically executes the adjustment before the grinding process begins. The eccentric shaft is positioned in advance to the optimal distance for the selected coffee type, allowing the user to simply select the coffee type rather than manually adjust mechanical components.
3Manufacturing precision
If motor-driven eccentric shaft is used, then manufacturing precision of grinding degree setting is improved, but device complexity increases
Solution Approach 1:
The patent applies the complex motor-driven mechanism only where precision is critical - in the axial adjustment of the grinding disc carrier - while keeping the rest of the grinder structure simple. The eccentric shaft mechanism is a localized solution that provides high-precision adjustment without complicating the overall device architecture.
Solution Approach 2:
The patent introduces dynamic adjustment capability through the motor-driven eccentric shaft, allowing the grinding disc distance to be changed during operation. This dynamic system replaces static manual adjustment, enabling the device to adapt to different coffee types and grinding requirements while maintaining a relatively simple overall structure.
4Reliability
If holding torque is provided in drive, then reliability of grinding degree setting is improved, but device complexity increases
Solution Approach 1:
The patent combines the holding torque function directly into the drive mechanism itself. The electric motor's inherent holding torque capability is utilized to maintain the eccentric shaft position without requiring separate locking mechanisms or additional components, achieving reliable setting stability while minimizing added 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 ensures consistent coffee quality by allowing precise control of the grinding degree, reducing manual effort, and enabling automated operation within a closed system for optimal coffee production.
Implementation Method 1
a preferably motor-driven eccentric shaft as an actuator for axially adjusting the grinding disc relative to the other grinding disc
Data Source
AI summary
Coffee grinder includes two grinding discs that can be rotated in opposite directions, the axial distance between which defines the degree of grinding of the coffee powder produced. The grinding discs are mounted one over the other within a grinder body, the lower grinding disc being rotatable about a vertical axis of rotation while the upper grinding disc can be adjusted non-rotatably and by an eccentric shaft relative to the lower grinding disc in the direction of the vertical axis of rotation. By rotating the eccentric shaft with a motorized drive, the space between the grinding discs can be changed. This enables almost infinite regulation of the degree of grinding when preparing the coffee.