Coffee Grinder Absolute Grind Size Setting with Extreme Position Stops
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Solution Overview
Problem
Existing grinding devices for coffee machines lack the ability to set an absolute, precisely determined grind size, which is disrupted when grinding bodies are removed for maintenance or malfunction, limiting control over coffee quality and flavor, especially in systems requiring remote monitoring.
Innovation Solution
The grinding device incorporates adjustable grinding bodies with stops at extreme positions defining a fixed setting range, allowing for an absolute grind size adjustment, and includes a controllable actuator and memory to maintain settings, with optional manual or automatic adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the grinding bodies are made adjustable to change grind size, then adaptability is improved, but the setting is lost when grinding bodies are removed for maintenance or malfunction
Solution Approach 1:
The patent applies preliminary action by providing stops at extreme positions (minimum and maximum clearance) that define a fixed setting range before any grinding operation occurs. These stops are pre-positioned on the grinding housing to establish absolute reference points, ensuring that when grinding bodies are removed and reinstalled, the setting range remains preserved and reproducible without requiring memory of previous adjustments.
2Ease of operation
If the grind size adjustment is made relative from current setting, then ease of operation is improved, but manufacturing precision is worsened because absolute setting cannot be imposed
Solution Approach 1:
The patent transitions from one-dimensional relative adjustment to two-dimensional adjustment by introducing a reference dimension through stops at extreme positions. The adjustable grinding body can be positioned anywhere within the defined range between minimum and maximum clearance stops, allowing absolute positioning based on the established reference points rather than solely relative movement from current setting.
Solution Approach 2:
The patent replaces the purely mechanical relative adjustment system with a system that incorporates fixed mechanical reference elements (stops). These stops provide absolute positional references that substitute for the need to maintain continuous mechanical memory of the setting, enabling both ease of operation and manufacturing precision.
3Manufacturing precision
If the setting range is made fixed with stops at extreme positions, then manufacturing precision is improved, but device complexity is worsened
Solution Approach 1:
The patent applies segmentation by dividing the adjustment range into defined segments bounded by stops at extreme positions. The setting range is segmented into a minimum clearance position, a maximum clearance position, and intermediate positions within the defined range. This segmentation provides precise manufacturing references without requiring complex overall device architecture.
Solution Approach 2:
The stops at extreme positions are self-contained features integrated into the grinding housing that automatically define the setting range without requiring external reference systems, memory devices, or complex control mechanisms. The structure serves its own reference function, eliminating the need for additional complexity while maintaining manufacturing precision.
Data Source
AI summary
A grinding device comprises a grinding housing with mutually co-acting grinding bodies. A lower of the two grinding bodies is both driven and axially adjustable for the purpose of setting a grind size. An upper grinding body is removable. A grind size of the grinding device can be adjusted in absolute manner between a first extreme position and a second extreme position, corresponding to a fixed setting range between a minimal clearance between the two grinding surfaces and a maximum clearance between the two grinding surfaces. An extreme position of the adjustable grinding body is imposed by a stop which is encountered by the adjusting means in the relevant extreme position. A coffee machine uses the absolute grind size and/or a fine-tuning for an optimal contact time between coffee and through-flowing water.