Slider Upper Blade Clearance Recess for Coating Fixation
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Solution Overview
Problem
Sliders for slide fasteners often experience issues during the coating process, where the pull can become immobilized or leave marks on the slider body due to the coating material, leading to defective products and reduced productivity.
Innovation Solution
The slider design includes an upper blade with a reference surface, clearance recesses, and projections that support the pull when tilted, creating a non-contact region between the pull and the upper blade, thereby reducing the risk of fixation and marking during coating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pull is held between the upper blade and cover body during assembly, then the pull can be securely positioned, but the pull becomes immobilized and fixed to the slider body during coating process
Solution Approach 1:
The upper blade is divided into multiple functional regions: a holding region with the first attachment column for securing the pull during normal operation, and a clearance region with the second attachment column that provides space for the pull to move freely during coating processes. This segmentation allows the pull to be positioned reliably during assembly while preventing immobilization during coating.
2Reliability
If the pull is held in contact with the upper blade, then the pull is securely positioned, but the pull leaves marks on the slider body during coating process
Solution Approach 1:
The harmful contact between the pull and upper blade during coating is eliminated by extracting the pull from the contact region. The clearance region with the second attachment column provides an alternative positioning space that is separated from the upper blade surface, preventing the pull from leaving marks on the slider body during the coating process.
3Ease of manufacture
If the slider structure is simplified with minimal components, then manufacturing is easier, but the pull cannot be properly supported when tilted
Solution Approach 1:
The upper blade is designed with multi-functionality to serve multiple purposes: it provides the first attachment column for securing the pull during normal operation, the second attachment column for positioning during coating, and the projection for supporting the pull when tilted. This multi-functional design maintains manufacturing simplicity while ensuring reliable pull support in various conditions.
4Ease of operation
If the clearance recess is positioned to include the intermediate region, then the pull has space to move during coating, but the structural integrity of the upper blade is compromised
Solution Approach 1:
The clearance region is designed with specific local quality characteristics: it is positioned to include the intermediate region to provide pull mobility during coating, but its depth and boundaries are carefully controlled to maintain the overall structural integrity of the upper blade. The projection is strategically positioned to provide additional support without requiring excessive material removal.
Data Source
AI summary
A slider according includes a slider body, a pull, and a cover body and is characterized in that an upper blade of the slider body includes a reference surface, a clearance recess having a shape recessed with respect to the reference surface, and a projection projecting from the reference surface, the reference surface and the clearance recess are disposed in each of left and right side regions, the clearance recess is disposed to include at least a part of an intermediate region provided between the first attachment column and the second attachment column in a length direction, and the projection is disposed at the rear of the intermediate region. Consequently, even when the slider is subjected to a coating process, a possibility of occurrence of fixation of the pull due to a coating material can be reduced.