Locking Knob Assembly for Precise Stepless Adjustment
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Solution Overview
Problem
Conventional knob assemblies, especially stepless ones, lack a mechanism to fix the knob's position, leading to setting inaccuracies due to movement or vibration of machines.
Innovation Solution
A knob assembly with a locking structure, comprising a tightening ring, a sliding member, and a knob, where the sliding member moves to lock the tightening ring around the central shaft of the knob, fixing its position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a stepless knob assembly is used for precise fine-tuning, then adjustment precision is improved, but position stability deteriorates due to lack of locking mechanism
Solution Approach 1:
The knob assembly transitions between two states: a release state where the knob can be freely rotated for fine-tuning, and a locking state where the knob position is fixed. The sliding member enables dynamic switching between these states, allowing the system to achieve both precision adjustment and position stability as needed
Solution Approach 2:
The locking mechanism is segmented into distinct components: a sliding member with separate release groove and tightening groove, and a tightening ring that can be positioned in different locations. This segmentation allows independent control of the locking and releasing functions while maintaining the overall integration of the knob assembly
2Stability of the object's composition
If a step knob assembly with locking mechanism is used, then position stability is improved, but fine-tuning capability deteriorates
Solution Approach 1:
The mechanism allows dynamic switching between locked and unlocked states. When unlocked, the knob provides continuous stepless adjustment for fine-tuning. When locked, it provides stable position fixing. This dynamic state change enables the system to overcome the static limitation of conventional step knobs
3Ease of operation
If the knob assembly is made freely rotatable for easy operation, then ease of operation is improved, but position accuracy deteriorates due to movement or vibration
Solution Approach 1:
After the user completes the rotation and adjustment operation, the sliding member is moved to engage the tightening ring, preliminarily securing the knob in its final position before any external movement or vibration occurs. This preliminary locking action prevents subsequent position drift
Data Source
AI summary
A knob assembly is assembled in a housing, to drive a rotary shaft. The housing includes a groove and a perforation. The knob assembly includes a tightening ring, a sliding member, and a knob. The sliding member includes a through hole, a release groove, and a tightening groove. A diameter of the release groove is greater than that of the tightening groove. The knob includes a rotary table and a central shaft. The central shaft is connected to the rotary table, sequentially penetrates through the through hole and the tightening ring to the perforation, and is sleeved on the rotary shaft. When the sliding member is moved from a release position to a locking position, the tightening ring is moved from the release groove to the tightening groove, to enable the tightening ring to tightly wrap the central shaft, so as to fix the knob.