Capsule Espresso Brewer Cam Clamping for Leak-Free Pressure Sealing
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Solution Overview
Problem
Existing espresso machines with disposable filters or capsules face issues of poor quality coffee due to uneven pressure distribution, water leakage, and mechanical reliability problems, primarily caused by a complex and unreliable spring mechanism that deforms under high pressure and temperature.
Innovation Solution
A semi-automatic, mechanical system for loading and removing disposable filters or capsules, featuring a grooving and tonguing joint, a ball-and-spherical cavity mechanism, and an electro-mechanical control system with a pressure cam and tappet, ensuring balanced high-pressure brewing and automatic capsule disposal, with adjustable capsule positioning and sealing to prevent deformation and leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a spring mechanism is used for capsule clamping and disposal, then the system can perform automatic capsule handling, but the mechanism becomes unreliable under high pressure and temperature
Solution Approach 1:
The patent removes the unreliable spring mechanism from the system and replaces it with a purely mechanical cam-based clamping system. The cam profile is specifically designed to provide the necessary clamping force during brewing and disposal operations, eliminating the component that failed under high pressure and temperature conditions.
Solution Approach 2:
The patent divides the capsule handling process into distinct phases controlled by separate mechanical elements: a cam mechanism for clamping during brewing, and a lever system for disposal after brewing. This segmentation allows each component to be optimized for its specific function rather than requiring a single mechanism to handle all operations under varying conditions.
2Adaptability or versatility
If pressure is distributed among clamping, disposal, and brewing systems, then all functions can be performed, but coffee quality deteriorates due to insufficient brewing pressure
Solution Approach 1:
The patent separates the pressure requirements for different functions by using a dedicated brewing pressure system that operates independently from the clamping and disposal mechanisms. The cam mechanism provides clamping force through mechanical leverage rather than hydraulic pressure, allowing the brewing pump to deliver full pressure (up to 9 bars) exclusively to the coffee extraction process.
Solution Approach 2:
The cam mechanism dynamically adjusts the clamping force on the capsule during the brewing cycle, providing maximum pressure when needed and releasing it automatically after brewing. This dynamic mechanical action allows the system to perform multiple functions without compromising the brewing pressure, as the cam's mechanical advantage varies throughout its rotation cycle.
3Extent of automation
If a complex spring mechanism is used for capsule disposal, then automatic removal is achieved, but the system becomes unreliable and requires frequent maintenance
Solution Approach 1:
The patent removes the complex spring mechanism entirely and replaces it with a simple lever-based disposal system. The lever is actuated by the cam mechanism after brewing completes, providing automatic capsule ejection through pure mechanical action. This eliminates the need for springs, reducing complexity and removing the source of reliability problems.
Solution Approach 2:
Instead of using an active spring mechanism to push the capsule out, the patent uses a passive lever system that is triggered by the cam's rotational position. The cam profile itself provides the driving force for disposal by mechanically lifting and releasing the lever, inverting the traditional approach where a separate actuator would be needed.
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
The solution provides a reliable, high-strength mechanical system for handling high pressures, preventing water leakage and scaling, and ensuring consistent coffee quality by maintaining mechanical integrity and reducing manual operations, allowing for precise capsule placement and removal.
Implementation Method 1
the perfect overlap of the two bodies is guided by a grooving and tonguing joint and a ball pressed on the bottom of the rotating body, that is housed in a spherical cavity on the fixed body
Implementation Method 2
A completely mechanical clamping system of the capsule infusion piston operated by a connection between pressure cam, tappet, heat exchanger and infusion piston
Implementation Method 3
a micro-regulation by mean of the tappet sliding in the housing shaped on the heat exchanger, controlled by two Belleville washers and a limit stop
Implementation Method 4
the electro-motor starts rotating, clockwise, of 180°; it drags the pressure cam and at the same time, the brewing cam which makes sure (by its synchronized position) that the capsule is pressed and, contemporary, sets in motion the electro-pump and the brewing
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
Espresso machine with disposable filter or capsule comprising a porta-capsule body comprising a rotating part (2) and a fixed part (3), an infusion piston (6), a pressure cam (7), a coffee brewing cam (19), control and regulation means, sealing means, characterized by the fact that: - the seal between the capsule (14) and the infusion piston (6) is ensured by a vertical mechanical motion, by means of the rotation of said cam (7); - the removal of the capsule is ensured by a rear sensor shaft system (29) and a front gravity extractor (35); - a semi-automatic system to load and remove the capsule; - electro-mechanical clamping and safety system operated by said cams (7, 19) and controlled by a number of micro-switches.