Coffee Machine Filter Holder Safety Detection to Prevent Piston Injury

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Solution Overview

Problem

Existing coffee machines lack safety features to prevent operator injury during beverage dispensing cycles, particularly when unintended contact occurs with operating parts.

Innovation Solution

A coffee machine with magnetic sensors and electromechanical safety switches that detect the correct positioning of the filter holder and interrupt the dispensing cycle if the holder is removed during operation, ensuring operator safety by preventing vertical piston movement.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the filter holder element can be removed during the dispensing cycle for operator access, then ease of operation is improved, but operator safety deteriorates due to risk of injury from unintended contact with moving parts

Engineering Contradiction:

Improveoperator access to filter holderVSAvoidinjury risk from piston movement

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The system performs preliminary detection of the filter holder position using magnetic sensors before allowing the piston to move. The safety switch is activated in advance to prevent piston movement when the filter holder is not properly positioned, eliminating the harmful effect before it can occur while maintaining operational flexibility

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

Magnetic sensors and electromechanical safety switches act as intermediary detection devices between the operator and the moving piston. These intermediaries detect the filter holder position and control piston movement, preventing direct harmful contact while allowing necessary operator access

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If magnetic sensors and safety switches are added to detect filter holder positioning, then operator safety is improved, but device complexity increases

Engineering Contradiction:

Improveinjury risk preventionVSAvoidnumber of detection components

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The magnetic sensors serve multiple functions: they detect the filter holder position for safety purposes, verify correct insertion, and enable the control unit to manage the dispensing cycle. This multi-functionality reduces the need for separate dedicated safety components, offsetting the added complexity with operational efficiency

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The system uses the existing magnetic elements on the filter holder fins in conjunction with magnetic sensors to automatically detect positioning and control piston movement. The filter holder itself provides the magnetic signature that triggers safety verification, making the system self-verify its own safety conditions without requiring additional active safety components

Inventive Principle:

Principle #25Self-service

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

Ensures operator safety by preventing accidents and ensuring correct beverage selection and preparation, enhancing safety and precision in coffee dispensing.

Implementation Method 1

detecting and controlling the magnetic elements EM located on the fins J1 and J2 of the filter holder PF

Methodology Applied

Scientific EffectMagnetic detection: Magnetism

Implementation Method 2

em electromechanical safety switches that detect the correct positioning of the filter holder and interrupt the dispensing cycle

Methodology Applied

Scientific EffectElectromechanical switching: Electromagnet

Data Source

PatentEP4635378A1Method for dispensing a coffee-based beverage

Publication Date: 2025.10.22 CMA MACCHINE PER CAFFE SRL

Figure 1A~1C
Figure 2

AI summary

A method for dispensing a coffee-based beverage in a coffee machine (M) provides for the sequential execution of the operating phases of: slidingly moving a filter holder element (PF) in a substantially horizontal and longitudinal direction to said machine (M) to bring it to a determined operational position completely within said coffee machine (M); detecting and controlling the position and/or parts of said filter holder element (PF); displaying predefined brewing options on a display screen of said coffee machine (M) and selecting a choice; depositing a dose of ground coffee onto said filter holder element (PF) of said coffee machine (M); carrying out vertical pressing of said dose of ground coffee on said filter holder element (PF); diffusing hot water over said dose of ground and pressed coffee; and dispensing by extraction the chosen beverage thus obtained.