Drive for the brewing unit of an automatic coffee maker
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Solution Overview
Problem
Conventional fully automatic coffee machines have motor and gear designs that are oversized due to uneven load profiles, leading to inefficiencies and increased costs, as they are designed for peak loads rather than average operation.
Innovation Solution
A non-linear gear section is introduced between the drive and brewing unit, allowing for varying travel speeds and forces, enabling maximum torque during load peaks while reducing power consumption during other phases, thus allowing the use of smaller and more cost-effective motors and power packs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the motor and gear are designed for peak loads, then reliability is improved, but device complexity and cost increase
Solution Approach 1:
The patent applies a non-linear gear mechanism that dynamically changes the transmission ratio during operation. The gear ratio is high during peak load phases (compression, sealing) to provide maximum torque, and low during traversal phases to enable faster movement. This dynamic adaptation allows the motor to be sized for average loads rather than peak loads, reducing device complexity and cost while maintaining reliability during critical operations.
2Force
If the motor is sized for peak loads, then force is improved, but use of energy worsens
Solution Approach 1:
The non-linear gear mechanism dynamically adjusts the transmission ratio to match the actual load requirements. During high-force需求的 phases like compression and sealing, the gear provides high reduction ratio for maximum torque. During low-load traversal phases, the reduction ratio is lowered, reducing energy consumption. This allows the motor to operate at optimal efficiency across different operational phases rather than constantly operating at peak capacity.
3Force
If the gear reduction is increased for peak loads, then force is improved, but speed worsens
Solution Approach 1:
The non-linear gear mechanism dynamically varies the reduction ratio throughout the operational cycle. During phases requiring high force (compression, sealing), the gear provides maximum reduction ratio. During traversal phases where speed is more important and load is minimal, the reduction ratio is reduced, allowing faster movement of the brewing unit. This dynamic adjustment resolves the trade-off between force and speed.
4Reliability
If thermal protection switches and large power packs are used, then reliability is improved, but cost increases
Solution Approach 1:
By implementing a non-linear gear mechanism that adapts the transmission ratio to actual load conditions, the motor operates efficiently across all phases without being continuously overloaded. This eliminates the need for oversized thermal protection switches and large power packs, reducing manufacturing costs while maintaining system reliability through intelligent mechanical design rather than oversized protective components.
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
This design enables shorter preparation times and reduced costs by optimizing motor usage and eliminating the need for expensive thermal protection switches, while maintaining efficient operation during peak loads.
Implementation Method 1
a non-linear gear section in the gear between the input and the output, which imparts non-linear properties to the entire gear. The non-linear gear section creates changing travel speeds and forces applied to the brewing chamber.
Implementation Method 2
The brewing cylinder disclosed there can be moved into different positions by a driven threaded spindle.
Data Source
AI summary
A fully automatic coffee machine for household purposes with a brewing unit, with an electric motor drive (10) of the brewing unit and with a gearbox between the drive (10) and the brewing unit is further developed by a non-linear gearbox section (20; 50) in the gearbox.