Coffee machine
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Solution Overview
Problem
Espresso coffee machines with lever-driven systems pose safety risks due to abrupt return movements of the driving lever when operating conditions, such as incorrect cup insertion or boiler pressure, are not met, potentially leading to operator injury.
Innovation Solution
A servo-control system is integrated into the lever mechanism to adjust and reduce the return speed of the lever, utilizing a braking device with a fluid-based mechanism to slow down the lever's return movement, ensuring safer operation by setting a minimum return time and reducing kinetic energy in case of incorrect conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If no braking device is provided, then the lever return speed is fast and the operation is efficient, but the safety risk increases due to abrupt return movements under incorrect operating conditions
Solution Approach 1:
A braking device is introduced as an intermediary element between the lever and the delivery unit. This braking device includes a braking member that can engage with the lever to control its return speed. The braking member is actuated by a braking fluid supplied from a reservoir, creating a controllable resistance that mediates the return motion of the lever, preventing abrupt movements while maintaining operational efficiency
Solution Approach 2:
The braking device utilizes hydraulic principles by employing a braking fluid contained in a reservoir. The fluid is supplied to the braking member under controlled pressure, allowing the operator to modulate the braking force applied to the lever during its return stroke. This hydraulic mechanism provides smooth, controlled deceleration of the lever, eliminating dangerous abrupt returns while preserving the speed necessary for efficient operation under correct conditions
2Reliability
If the lever return speed is reduced to prevent injury, then the safety improves, but the operation time increases and productivity decreases
Solution Approach 1:
The braking device is designed with dynamic characteristics that allow the lever return speed to vary during the return stroke. The braking force is not constant but changes as the lever moves, providing maximum braking when needed and reducing resistance as the lever approaches its starting position. This dynamic braking approach ensures safety during the critical deceleration phase while minimizing the total time required for the lever to complete its return cycle
Solution Approach 2:
The braking action is applied periodically during the lever return stroke rather than continuously. The braking member engages and disengages in a controlled manner, providing intermittent resistance that slows the lever at critical points in its trajectory while allowing faster movement during less critical phases. This periodic application of braking force maintains safety without unnecessarily extending the overall operation time
3Reliability
If a braking device is added to control lever return speed, then the safety increases, but the device complexity increases
Solution Approach 1:
The braking device is integrated into the existing lever mechanism in a way that allows it to serve multiple functions. Besides providing the primary safety function of controlling lever return speed, the braking mechanism also serves as a damping element during normal operation, helps maintain lever position stability, and can be adapted to work with different lever configurations. This multi-functionality reduces the need for separate safety mechanisms and minimizes overall system complexity
Solution Approach 2:
The braking components are nested within the existing lever assembly structure. The braking member is positioned within the lever's movement path but does not require separate housing or mounting structures. The braking fluid reservoir is integrated into the existing fluid system of the coffee machine, sharing pipelines and connection points with the delivery unit hydraulic system. This nested arrangement minimizes additional parts and simplifies the overall device architecture
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 enhances safety by preventing sudden and dangerous lever returns, allowing operators to control the lever more effectively and reducing the risk of injury, while maintaining the standard operation force and coffee extraction process.
Implementation Method 1
The braking device (6) is configured in such a way as to exert a braking force on the driving device (25) by means of a fluid pressure
Data Source
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AI summary
Machine for making espresso coffee of the type provided with at least one delivery unit and with a driving device provided with a lever, which is movable from a first lever position to a second lever position, wherein the delivery unit comprises at least one braking device.