Brewing Cylinder Screw Drive With Elastic Backlash Compensation
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Solution Overview
Problem
Current coffee machine movement systems suffer from mechanical backlash, rapid wear, and noise emissions due to mechanical components, leading to perceived malfunctions and reduced maintenance efficiency.
Innovation Solution
Incorporation of elastic means, such as an auxiliary nut screw and tensioned elastic elements, to compensate for mechanical backlash between the threads of the screw and nut screw, ensuring consistent contact force and reducing vibrations and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a nut screw and motorised screw movement system is used for the brewing cylinder, then the brewing cylinder can be moved and positioned, but mechanical backlash occurs between the threads causing wear and noise emissions
Solution Approach 1:
A second nut screw is introduced as an intermediary element between the first nut screw and the brewing cylinder support. This second nut screw acts as a mediator that absorbs and compensates for mechanical backlash in the screw-thread connection, preventing direct contact and friction between the first nut screw threads and the support, thereby reducing wear and noise while maintaining reliable positioning of the brewing cylinder
Solution Approach 2:
The system changes the friction parameter by introducing a frictionless or low-friction connection between the second nut screw and the brewing cylinder support. This parameter change reduces the harmful friction and wear in the movement system while maintaining the necessary mechanical coupling for precise positioning of the brewing cylinder
2Productivity
If mechanical components are used in the movement system, then the brewing cylinder can be actuated, but rapid wear occurs reducing maintenance efficiency
Solution Approach 1:
The second nut screw serves as a sacrificial intermediary that takes on the wear from the screw threads, protecting the first nut screw and support from rapid wear. This intermediary element extends the service life of the critical movement system components while maintaining productive operation with reduced maintenance requirements
3Object-affected harmful factors
If a simple nut screw system is used, then the device complexity is low, but noise emissions occur affecting user perception
Solution Approach 1:
The second nut screw is a relatively simple intermediary component that eliminates noise emissions from the movement system without requiring complex mechanisms. This simple addition absorbs vibrations and prevents noisy friction between the first nut screw and support, maintaining device simplicity while significantly reducing noise that would affect user perception
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 extends the service life of the coffee machine, ensures silent operation, and reduces routine maintenance by eliminating mechanical backlash and noise, while maintaining performance standards.
Implementation Method 1
said elastic means comprises an auxiliary nut screw engaged with said screw and guided in translation along said screw, and at least one tensioned elastic element connecting said nut screw supporting said support and said auxiliary nut screw
Data Source
AI summary
The coffee machine (1) comprises a brewing cylinder (2), a movement system of the brewing cylinder (2) comprising a nut screw (8) engaged with a motorised screw (9), and elastic means (13) compensating the mechanical backlash between the threads of the screw (9) and of the nut screw (8).