High-precision externally-adjustable coffee grinder
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electric coffee grinders face issues with low precision in adjusting coffee powder coarseness due to limited adjusting ranges and complex operation mechanisms, leading to instability and user confusion.
Innovation Solution
A high-precision externally-adjustable coffee grinder with a coarseness adjusting structure that includes an external adjusting ring and internal driving ring, utilizing a reduction gear mechanism to enhance precision and simplify the adjustment process, while avoiding motor movement to maintain stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a one-turn adjusting ring is used to adjust the grinding disc gap, then the adjustment operation is simple and convenient, but the adjusting precision is poor due to limited rotation angle range
Solution Approach 1:
The adjusting ring is divided into multiple independent adjusting pieces (first adjusting piece, second adjusting piece, third adjusting piece) with different functions. The first adjusting piece controls coarse adjustment (0-2mm range), the second adjusting piece controls fine adjustment (0.2-0.5mm range), and the third adjusting piece controls precise adjustment (0.05-0.1mm range). This segmentation allows each piece to have optimal rotation angle and precision for its specific adjustment range, resolving the contradiction between operational simplicity and adjusting precision.
2Measurement precision
If a multi-turn adjusting piece is used to improve adjusting precision, then the adjusting precision is improved, but the operation becomes complex and users get confused about the number of turns and rotation scales
Solution Approach 1:
The adjusting mechanism is segmented into three independent adjusting pieces, each with its own dedicated rotation scale and adjustment range. Users only need to focus on one adjusting piece and its corresponding scale at a time, eliminating the confusion of tracking multiple turns across a single multi-turn mechanism. Each adjusting piece operates within a limited rotation angle (less than 360 degrees), making it easy to read and control.
Solution Approach 2:
Each adjusting piece is designed with localized adjustment functionality and dedicated scale markings. The first adjusting piece has scales for 0-2mm adjustment, the second has scales for 0.2-0.5mm adjustment, and the third has scales for 0.05-0.1mm adjustment. This local quality approach ensures that each component has optimized characteristics for its specific function, improving overall precision without increasing operational complexity.
3Device complexity
If the adjusting knob is arranged at a lower end of the movable cutterhead (downward-adjusting), then the structure is compact, but the adjusting operation is inconvenient
Solution Approach 1:
Instead of placing the adjusting knob at the lower end of the movable cutterhead (downward-adjusting), the invention inverts the adjustment direction by placing the adjusting knob at the upper end of the main body (upward-adjusting). This inversion makes the adjusting knob more accessible and easier to operate, while the adjusting mechanism still achieves compact structure through the threaded connection between the adjusting knob and mounting shaft.
4Ease of operation
If the adjusting knob drives the motor to move up and down (making motor mounting rack movable), then the adjusting operation is convenient, but the motor movement causes fatigue and gradual displacement of the adjusting structure, affecting stability
Solution Approach 1:
The invention extracts the motor from the moving part of the adjusting mechanism and fixes it to the stationary main body. The adjusting knob drives a lifting rod through a threaded connection, which directly adjusts the position of the movable cutterhead without moving the motor. This separation ensures that the motor remains stationary, eliminating fatigue and gradual displacement, while the adjusting operation remains convenient through the upward-adjusting design.
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 provides improved precision and ease of use by allowing multi-stage adjustments with clear scale indications, ensuring stable and uniform grinding coarseness without motor displacement, thus enhancing user experience and market competitiveness.
Implementation Method 1
a transmission gear, the internal toothed ring of the external adjusting ring being engaged with an external toothed ring of the internal driving ring through the transmission gear
Implementation Method 2
the adjusting knob is in threaded connection with a mounting shaft
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Disclosed in the present invention is a high-precision externally-adjustable coffee grinder, including a main housing, a lifting rod, a grinding assembly and a coarseness adjusting structure, where the coarseness adjusting structure includes an external adjusting ring, an internal driving ring, a transmission gear; the external adjusting ring is sleeved and rotates relative to the main housing; the external adjusting ring includes an internal toothed ring; the internal driving ring includes an external toothed ring; the external adjusting ring is engaged with the internal driving ring through the transmission gear; and the external adjusting ring drives the internal driving ring to rotate to drive the lifting rod to adjust a grinding disc gap. The number of turns of the internal driving toothed ring is increased, so that the adjusting precision of the adjusting structure is greatly improved, the advantages of convenient adjustment of the externally-adjustable coffee grinder and clear scale indication of a one-turn coffee grinder are retained, and the problem of low precision of the one-turn adjusting coffee grinder in the prior art is solved.