Conversion Press Retaining Bar Assembly for Idle Shell Retention
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Solution Overview
Problem
In six-out conversion presses, the existing retainer pins cannot access shells at idle stations due to the wider tab strip covering more than a 2x2 cluster of shells, leading to potential shifting or becoming askew during the forming process due to vibrations and other forces.
Innovation Solution
A retainer assembly with a retaining member assembly and motion assembly is introduced, allowing the retaining member to move between positions to selectively retain shells in the transfer belt recesses, ensuring they remain in place during the forming process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a wider tab strip is used to accommodate six rows of tabs, then the productivity of the conversion press is improved, but the existing retainer pins cannot access shells at idle stations, causing shells to shift or become askew
Solution Approach 1:
The retainer assembly is designed to move between an upper position (when the tab strip is in the lower position) and a lower position (when the tab strip is in the upper position). This dynamic positioning allows the retainer to access and engage shells at idle stations during tab formation while maintaining productivity with a wider tab strip accommodating six rows of tabs
2Reliability
If retainer pins are used to engage shells at idle stations, then shell positioning stability is improved, but the tab strip width must be limited to accommodate a 2x2 cluster of shells, reducing productivity
Solution Approach 1:
The retainer assembly moves vertically in coordination with the tab strip position. When the tab strip is lowered to form tabs, the retainer assembly rises to engage shells at idle stations. When the tab strip is raised, the retainer assembly lowers to its upper position. This dynamic coordination allows both shell retention and wider tab strip configuration
Solution Approach 2:
The retainer assembly introduces vertical motion as an additional dimension to the existing horizontal tab strip configuration. By moving the retainer in the vertical dimension, the system can engage shells at idle stations without restricting the horizontal width of the tab strip, enabling six-row tab formation
Data Source
AI summary
A retainer assembly includes a retaining member assembly and a motion assembly. The retaining member assembly is structured to selectively retain at least one shell in a transfer belt assembly belt recess. The retaining member assembly includes a retaining member. The motion assembly is structured to move the retaining member between a first position, wherein the retaining member is spaced from the transfer belt assembly transfer belt, and, a second position, wherein the retaining member is disposed a retaining distance from the transfer belt assembly transfer belt.