Scales unit for a coffee bean grinder, coffee bean grinder with integrated scales unit and method for operating a coffee bean grinder
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Solution Overview
Problem
Existing coffee bean grinders face challenges in accurately measuring coffee powder weight, particularly when grinding directly into a portafilter, as indirect methods like timing or volumetric dosing lead to deviations, and known solutions with load cells are either complex or require coffee powder to be transferred from a storage container.
Innovation Solution
A weighing unit integrated into the coffee bean grinder that includes a receiving device for the portafilter connected to a load cell, allowing direct weight measurement of the portafilter, with a path-limiting mechanism to prevent overload and a compact design suitable for various grinders and portafilters, enabling precise weight determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a load cell is used to measure coffee powder weight directly in the portafilter, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The receiving device for the portafilter is merged with the weighing cell into a single integrated unit. The weighing cell serves dual functions: supporting the portafilter during grinding and measuring its weight. This integration eliminates the need for separate measurement devices while maintaining measurement precision.
Solution Approach 2:
The weighing cell is designed to perform multiple functions: it acts as both a structural support element for the portafilter and a measurement device. This multi-functionality reduces the overall number of components needed in the system while achieving accurate weight measurement.
2Measurement precision
If the load cell is made sensitive for precise measurement, then measurement precision is improved, but reliability decreases due to vulnerability to mechanical forces
Solution Approach 1:
A path-limiting means is built into the receiving device to prevent excessive movement of the weighing cell before damage can occur. This protective feature is integrated into the design from the outset, limiting the travel of the weighing cell to safe boundaries that protect the sensitive load cell from mechanical overload.
3Adaptability or versatility
If the weighing unit is designed to accommodate various portafilters, then adaptability is improved, but device complexity increases
Solution Approach 1:
The receiving device is designed with universal characteristics that allow it to accommodate different types of portafilters. The weighing cell and receiving device structure are configured to work with various portafilter designs without requiring complex adjustment mechanisms, achieving versatility through thoughtful structural design.
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 precise and direct measurement of coffee powder weight in the sieve, reducing deviations and simplifying the process, while being adaptable to different portafilters and grinders, ensuring optimal power transmission and minimizing vibrations.
Implementation Method 1
a receiving device 14 for a portafilter 15, which is in operative connection with the weighing cell 9
Implementation Method 2
All devices that enable weight determination by outputting an electrical signal are suitable as load cells
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
Weighing unit (5) for a coffee bean grinder (1) comprising a weighing cell (9), the weighing cell (9) being operatively connected to a receiving device (14) for a portafilter (15).