Spring-Biased Crowder Assembly for Debris-Resistant Hemming
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Solution Overview
Problem
Hemming devices in manufacturing operations often clog with debris, leading to interference issues, reduced dimensional accuracy, repeatability, and increased downtime due to lock-ups during hemming operations.
Innovation Solution
The use of crowder assemblies with a base, angled support bars, and a flat spring mechanism to retain panels during hemming, preventing interference and clogging by allowing the crowder block to move with the roller while being biased back by the spring after passage, thus maintaining panel alignment and reducing debris accumulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hemming devices are used to hem panels together, then panels can be joined effectively, but the devices clog with debris (oil and metallic dust) causing lock-ups and downtime
Solution Approach 1:
The crowder block is extracted from the traditional fixed hemming device structure and positioned separately on the support bar, allowing it to be easily removed and cleaned. The flat spring mechanism is also separated from the main hemming device, enabling independent maintenance of the crowder assembly without disassembling the entire hemming system.
Solution Approach 2:
The crowder block is made dynamic through the flat spring mechanism, allowing it to move vertically in response to panel thickness variations. This dynamic adjustment prevents the block from becoming stuck in debris and maintains continuous operation without lock-ups.
2Manufacturing precision
If hemming devices are used to retain panels during hemming, then panels can be held in position, but the devices interfere with other components and reduce dimensional accuracy
Solution Approach 1:
The hemming system is segmented into independent components: the crowder assembly with support bars and flat spring mechanism is separated from the main hemming device. This segmentation allows each component to perform its function without interfering with others, maintaining dimensional accuracy while simplifying the overall system.
Solution Approach 2:
The flat spring acts as an intermediary between the crowder block and the base, providing a compliant connection that accommodates dimensional variations in panels while maintaining retention force. This intermediary mechanism prevents direct interference between the crowder block and other components.
3Productivity
If traditional crowder assemblies are used, then panels can be retained during hemming, but the assemblies require frequent disassembly and cleaning, increasing downtime
Solution Approach 1:
The flat spring mechanism automatically returns the crowder block to its initial position after each hemming cycle, eliminating the need for manual resetting. The open design allows debris to fall through freely, and the spring automatically compensates for any minor accumulations, enabling the system to maintain operation without frequent interruptions for cleaning.
Solution Approach 2:
The design allows debris to be discarded naturally through the open structure of the support bars and base. The flat spring mechanism recovers the crowder block's position automatically after each cycle, maintaining readiness for the next operation without requiring manual intervention or cleaning downtime.
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 enhances manufacturing throughput, reliability, and dimensional accuracy by reducing clogging, extending crowder lifespan, minimizing downtime, and lowering maintenance and replacement costs.
Implementation Method 1
The flat spring includes a first end segment coupled to the base, and a second end segment coupled to the crowder block. The flat spring biases the crowder block in response to movement of the crowder block.
Data Source
AI summary
The present disclosure relates to crowder assemblies, hemming apparatus, and related components for manufacturing operations. In one or more embodiments, crowder assemblies are used to retain panels that are hemmed together using a hemming apparatus. In one or more embodiments, a crowder assembly for manufacturing operations includes a base, a first support bar coupled to the base and extending relative to an outer face of the base, and a second support bar coupled to the first support bar and oriented at an angle relative to the first support bar. The second support bar includes an opening. The crowder assembly includes a crowder block positioned in the opening of the second support bar, and a flat spring. The flat spring includes a first end segment coupled to the base, and a second end segment coupled to the crowder block.The flat spring biases the crowder block in response to movement of the crowder block.