Process for grinding and dosing coffee beans with automatic and continuous dose calibration
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Solution Overview
Problem
Conventional coffee grinder-dosers for professional espresso machines are inefficient and imprecise in maintaining the desired grammage due to manual calibration processes, which are time-consuming, prone to errors, and disrupt normal operations, especially when dealing with small quantities and variable environmental conditions.
Innovation Solution
An automatic process that continuously calibrates the grinding time using an integrated load cell weighing device, allowing for self-calibration cycles to adjust the grinding time based on real-time weight measurements, ensuring precise and consistent coffee dosing without operator intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual calibration is used to adjust grinding time, then the desired grammage can be set, but the process is time-consuming and disrupts normal operations
Solution Approach 1:
The system performs automatic self-calibration using an integrated load cell weighing device that continuously monitors actual dispensed coffee weight and automatically adjusts grinding time parameters without requiring operator intervention. The microprocessor-controlled system compares measured weights against target grammage and autonomously modifies grinding duration to maintain precision.
Solution Approach 2:
The load cell weighing device provides real-time feedback on actual coffee dispensed weight to the microprocessor control unit. This feedback loop enables continuous monitoring and automatic adjustment of grinding time based on measured deviations from target grammage, ensuring sustained precision without manual recalibration.
2Measurement precision
If manual calibration is performed periodically, then grammage accuracy can be maintained, but normal coffee preparation operations are interrupted
Solution Approach 1:
The automatic calibration system operates continuously in the background during normal coffee preparation without interrupting service. The load cell continuously measures dispensed weight and the microprocessor continuously adjusts grinding time parameters, maintaining grammage accuracy throughout operational periods rather than requiring periodic stoppages for recalibration.
Solution Approach 2:
The system autonomously maintains grammage accuracy through continuous automatic calibration without requiring operator intervention or disruption of coffee preparation workflows. The integrated weighing device and control system work together to self-correct grinding time variations caused by wear or environmental changes.
3Device complexity
If fixed grinding time is used, then the process is simple, but grammage varies due to environmental conditions and machine wear
Solution Approach 1:
The system dynamically adjusts grinding time based on real-time feedback from the load cell weighing device. Rather than using a fixed predetermined time, the microprocessor continuously modifies grinding duration parameters in response to measured variations in actual dispensed weight, adapting to machine wear and environmental conditions while maintaining grammage consistency.
Solution Approach 2:
The microprocessor-controlled system automatically changes the grinding time parameter based on feedback from the weighing device. When deviations from target grammage are detected, the system modifies grinding duration to compensate for variations caused by environmental factors or machine wear, maintaining reliable grammage consistency through dynamic parameter adjustment.
4Measurement precision
If automatic weighing during grinding is implemented, then real-time dosage control is achieved, but the system complexity increases
Solution Approach 1:
The integrated load cell weighing device serves multiple functions: it weighs the coffee beans before grinding, measures the actual dispensed coffee weight during calibration, and provides feedback for automatic parameter adjustment. This multi-functional component adds measurement capability without requiring separate weighing systems, thereby limiting the increase in overall system complexity.
Solution Approach 2:
The weighing function is merged with the grinding and dosing system through integration of the load cell into the existing apparatus. The control unit that manages grinding operations also processes weighing data and automatically adjusts parameters, combining multiple functions into a unified system rather than adding separate independent subsystems.
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 enables continuous, precise, and reliable coffee dosing, reducing manual errors and operational interruptions, maintaining consistent coffee quality despite variations in coffee beans, machine maintenance, and environmental conditions.
Implementation Method 1
The automatic calibration process (10) is applicable by means of a grinder-doser (20) which includes an electronic weighing device (204a-b) with load cell (208)
Data Source
AI summary
Automatic process for calibrating the single and double dose of ground and dispensed coffee by means of a specific grinder-doser integrating a weighing device with a load cell. The process is automatically and steadily carried out during the ordinary activity, with no interruptions, adapting the grinding time according to the actually detected grammages, in order to get closer as much as possible to the desired grammage in any use condition. The process, after a preliminary phase for temporary configuring the desired grammages and the grinding time, conceives self-calibration cycles continuously repeated, each of them comprising three sequential phases: a first phase for automatically checking the dispensing with progressive weight detections, a second phase for automatically processing the detected data for determining the correct grinding time, a following third phase for the automatic setting.