Variable-Volume Brewing Unit With Cam-Controlled Piston Motion
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Solution Overview
Problem
Existing brewing units for automatic beverage machines lack the ability to handle variable brewing chamber volumes and doses, limiting their capability to produce different beverage qualities and quantities efficiently, such as espresso and fresh-brew coffee, while also increasing mechanical stress on the motor assembly.
Innovation Solution
A brewing unit with a rotating seat and sliding piston, controlled by cam profiles, allows for multiple brewing positions and volumes, reducing mechanical stress by distributing pressure forces through cam profiles, enabling the production of various beverage qualities and quantities in a single brewing cycle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a brewing unit uses a fixed brewing chamber volume, then the structure is simple, but it cannot produce beverages of different qualities and quantities
Solution Approach 1:
The brewing chamber volume is made dynamic through a piston that can move between multiple positions (first, second, and intermediate positions). This allows the same brewing unit to accommodate different coffee doses and produce various beverage types (espresso, fresh-brew, etc.) by simply changing the piston position, rather than requiring multiple fixed-volume chambers.
2Adaptability or versatility
If the brewing chamber volume is made variable, then different beverage qualities can be produced, but mechanical stress on the motor assembly increases
Solution Approach 1:
A cam profile mechanism acts as an intermediary between the motor assembly and the piston. The cam profile translates the motor's rotational motion into controlled linear piston movement while distributing and managing the mechanical forces. This intermediary mechanism reduces the direct mechanical stress on the motor assembly by providing a mechanical advantage and force distribution system.
3Productivity
If multiple brewing positions are implemented, then productivity increases, but the device complexity increases
Solution Approach 1:
The brewing unit employs universal components that serve multiple functions. The single piston mechanism can occupy different positions to produce various beverage types, the cam profile system controls multiple brewing parameters through a single rotational input, and the brewing chamber serves different volume requirements without requiring separate chambers. This multi-functionality approach increases productivity while limiting the growth of device complexity.
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 brewing unit achieves efficient production of different beverage qualities and quantities by varying the brewing chamber volume, minimizing mechanical stress on the motor assembly and enhancing operational flexibility.
Implementation Method 1
cam members for controlling the movements of the seat, of the piston, and of the counter-piston
Implementation Method 2
a piston... and a counter-piston co-operating with said seat and said piston to define a brewing chamber
Implementation Method 3
hot water is made to pass inside it at an adequate pressure for extracting the aromas from the ground coffee
Implementation Method 4
the forces acting on the parts forming the brewing chamber due to the pressure of the water supplied in the chamber itself are discharged on the supporting structure
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The brewing unit comprises a seat (19) having a rotation movement, in which a piston is slidably received (13). A counter-piston (41) co-operates with the seat and the piston to define a brewing chamber. Moreover provided are cam members (25, 45) for controlling the movements of the seat, of the piston, and of the counter-piston. The seat, the piston and the counter-piston can assume with respect to one another at least one position of charging of a product for preparation of the beverage, at least two distinct brewing positions to which there correspond two different volumes of the brewing chamber, and a osition for dischar in the s ent roduct.