Filter Holder Detection at Bayonet Stop Position in Coffee Machines

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Solution Overview

Problem

Existing detection systems for filter holders in espresso machines are unreliable and impractical, especially when the filter holder is coupled with a ring in bayonet coupling mode, as they require continuous maintenance and are cumbersome, expensive, and prone to damage.

Innovation Solution

A proximity sensor is installed in the stop point of the rotation of the filter holder in the ring, allowing for the detection of the filter holder's correct insertion and fixation when rotated, eliminating the need for moving parts and simplifying installation and maintenance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If optical sensors are used to detect the filter holder, then the presence can be detected, but the system becomes unreliable and requires continuous cleaning and maintenance

Engineering Contradiction:

Improvedetection reliabilityVSAvoidmaintenance requirement

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent replaces optical sensors with a mechanical detection system using a detection lever that physically interacts with the filter holder's detection tab. This mechanical system detects the bayonet coupling rotation and locking states through direct physical contact, eliminating the need for optical sensors that require cleaning and maintenance in the harsh dispensing environment.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The detection lever acts as an intermediary mechanical element between the filter holder's detection tab and the control system. The lever translates the mechanical state of the bayonet coupling (rotated and locked positions) into detectable positional changes, providing reliable detection without requiring direct optical sensing that would be affected by coffee residues and steam.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If a mobile element revolvingly mounted on the ring is used for detection, then the filter holder insertion can be detected, but the device becomes complex, expensive, and prone to damage

Engineering Contradiction:

Improvedetection accuracyVSAvoidsystem complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent extracts the detection function from a complex mobile revolving element system and implements it through a simplified stationary detection lever. The detection lever remains fixed while detecting the rotational position of the filter holder's detection tab, eliminating the need for moving parts in the detection mechanism itself and reducing system complexity and cost.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

Instead of having a mobile detection element that moves with the filter holder rotation, the patent inverts the approach by using a stationary detection lever that detects the filter holder's position through direct mechanical contact. The detection tab on the filter holder moves relative to the stationary lever, simplifying the detection system while maintaining accuracy.

Inventive Principle:

Principle #13The other way round (Inversion)

3Difficulty of detecting and measuring

If detection sensors are positioned in the work space under the dispensing assembly, then the filter holder can be detected, but the sensors are exposed to water jets, vapor, and coffee residues requiring frequent cleaning

Engineering Contradiction:

Improvedetection capabilityVSAvoidexposure to contaminants

Core Design Contradiction:

Difficulty of detecting and measuringVSObject-affected harmful factors

Solution Approach 1:

The patent replaces vulnerable optical sensors exposed to contaminants with a mechanical detection lever system. The lever and detection tab mechanism operates through direct mechanical contact, detecting the filter holder's bayonet coupling state without being affected by water jets, vapor, or coffee residues that would impair optical sensing.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The mechanical detection system is integrated into the bayonet coupling mechanism itself, using the filter holder's own detection tab as the sensing element. This self-service approach eliminates the need for separate detection components that would require maintenance, as the detection function is inherent in the coupling mechanism's mechanical interaction.

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS11470995B2System for detecting a filter holder in a dispensing assembly of a coffee machine

Publication Date: 2022.10.18 SIMONELLI GRP SPA

AI summary

A system for detecting the presence of a filter holder in a dispensing assembly of a coffee machine includes: a ring with an internal groove, a filter holder with a tab coupled with the groove and a proximity sensor. The groove has a semi-annular shape and is configured in such a way to receive the tab of the filter holder in bayonet coupling mode, wherein the filter holder is translated and rotated. The ring has a rotation stopper suitable for stopping the rotation of the filter holder in the ring in a stop point. The proximity sensor passes through the ring and finishes in the stop point of the groove of the ring.