Slider Feed Mechanism Using Biased Roller Contact Instead of Rack Teeth
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing rack-and-pinion mechanism for moving sliders in measuring devices is prone to processing difficulties and costs due to accurate tooth cutting requirements, and is susceptible to instability from fine dust interference, while thumb rollers face usability issues with heavy sliders and inefficient measurement efficiency.
Innovation Solution
A feed mechanism comprising a driving gear, a driven roller that meshes with the driving gear, an arm with a cup portion to receive the driven roller, and a biaser to abut the roller against the main scale, eliminating the need for a rack-and-pinion system by using a driven gear, clamping disk, and coupling shaft for direct or indirect meshing and clamping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a rack-and-pinion mechanism is used to move the slider, then the slider can be moved along the measurement length, but processing difficulties and costs increase due to accurate tooth cutting requirements on a long rack
Solution Approach 1:
The long rack is divided into multiple shorter rack sections (first rack, second rack, etc.) that can be manufactured separately with standard tooth cutting processes, then assembled together to cover the full measurement length. This segmentation allows each rack section to be produced with常规加工 methods without requiring expensive long-rack tooth cutting equipment.
Solution Approach 2:
Multiple rack sections are nested or joined together to form a complete long-range rack system. The pinion engages with these segmented racks in sequence or simultaneously, allowing the slider to traverse the full measurement length while each rack segment maintains manufacturable dimensions for accurate tooth cutting.
2Ease of operation
If a rack-and-pinion mechanism is used, then the slider can be moved, but tooth surface damage occurs when fine dust is caught between the rack and pinion, making positioning unstable
Solution Approach 1:
A dust removal device is introduced as an intermediary component between the rack and pinion. This device actively removes fine dust particles from the meshing area, preventing dust from being trapped between the rack teeth and pinion teeth, thereby maintaining stable positioning while preserving slider movement capability.
Solution Approach 2:
The dust removal device converts the harmful effect of fine dust into a controlled situation where dust is continuously evacuated from the meshing zone. By anticipating and addressing the dust problem proactively, the system maintains reliable positioning stability without sacrificing operational ease.
3Ease of manufacture
If a thumb roller is used to move the slider, then the rack-and-pinion problems are avoided, but it is difficult to rotate the thumb roller while pushing it with the thumb due to the heavy slider
Solution Approach 1:
A spring mechanism is introduced to counterbalance part of the slider's weight, reducing the effective weight that the user must overcome when operating the thumb roller. The spring provides an upward force that offsets gravitational force on the slider, making the thumb roller easier to rotate and push despite the slider's heavy mass.
4Ease of manufacture
If a thumb roller is used alone to move the slider, then rack-and-pinion issues are avoided, but measurement efficiency decreases when moving from end to end of measurement stroke
Solution Approach 1:
The feed mechanism transitions from a static thumb roller alone to a dynamic system combining thumb roller, spring assistance, and dust removal. The spring provides dynamic force assistance during slider movement, reducing user effort and enabling faster end-to-end traversal while maintaining the simplified structure without rack-and-pinion.
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 solution provides a convenient, durable, and cost-effective method for moving sliders, reducing manufacturing costs and avoiding tooth surface damage, while maintaining operability and stability even on wavy surfaces without the need for a long rack, enhancing measurement efficiency and usability.
Implementation Method 1
a biaser configured to bias the cup portion, which is in a state of receiving the driven roller, toward the main scale
Implementation Method 2
a driven roller configured to mesh with the driving gear directly or indirectly and to rotate by rotation of the driving gear
Data Source
AI summary
Described is a feed mechanism for a slider which is convenient to use with good durability and low costs by eliminating a rack-and-pinion method. The feed mechanism allows the slider to be fed and moved along a longitudinal main scale. The feed mechanism includes a driving gear that is a gear train pivotally supported by the slider, a driven roller that meshes with the driving gear and rotates by rotation of the driving gear, and an arm that includes a cup portion capable of receiving the driven roller on a distal end. The arm includes the cup portion capable of receiving the driven roller on the distal end and is pivotally supported by the slider on a base end. The cup portion in a state of receiving the driven roller is biased toward the main scale by a pin plunger. Accordingly, the driven roller is kept abutted against the main scale.