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Automated Paper Handling - Custom Automated System Design
Automating a manual paper handling process to increase production yield, from problem identification through physical validation
The Problem
Manual paper handling limiting production throughput and cycle time
7% sheet failure rate from operator misorientation during loading
No existing spec or solution for this specific material handling problem
My Role:
Led mechanical design of the automated handling system, owned end effector design, tolerance analysis, and physical validation end to end.
System Overview
Paper magazine
Vacuum gripper end effector
Geometry-controlled feed channel
Linear rail transfer system
Pneumatic actuation
End Effector Deep Dive
Design & Iteration: To automate material transfer upstream, a pneumatic actuator-driven vacuum gripper end effector was designed for A1-format stiff cardboard sheets. Required suction force was back-calculated from lift requirements, and two suction cup layouts were evaluated, a parallel dual-line array and a cross-pattern, to optimize distributed contact force across the sheet surface without creasing or deformation.
OEM suction cups were selected against availability, cost, and lead time constraints. The first prototype over-spec'd suction force, sheets could not be manually removed safely, a critical operational requirement that had not been captured in the initial spec. The target was revised to 3.7N with a 1.5x safety factor and validated through physical testing, confirming zero sheet deformation and consistent grip across full assembly translation.
Feed Channel — Misorientation Fix
While analyzing the manual process, a 7% sheet failure rate from operator misorientation was identified. At the production scale being targeted, 7% failure compounds directly into yield loss, addressing it was central to the automation goal.
A geometry-controlled pneumatic feed channel was designed to make incorrect sheet orientation physically impossible. A 1D RSS tolerance stack-up referenced to the primary paper seating datum defined channel clearance. Sheet dimensional variation was physically measured across prototyped holders and clearance iteratively optimized to block wrong insertions while eliminating jam risk across the full measured variation range.
Predicted failure rate dropped from 7% to 0.5%.
Key Engineering Decisions
Rejected sensor-based fix, solved through mechanical geometry instead, eliminating the failure mode rather than detecting it after the fact.
Selected cross-pattern suction cup layout to optimize distributed contact force across the full sheet surface without creasing.
Iterated gripper design after first prototype over-spec'd suction force prevented safe manual sheet removal, a critical operational requirement revised to 3.7N with 1.5x safety factor.
RSS tolerance stack-up referenced to primary paper seating datum to bound channel clearance and eliminate misorientation across the full sheet dimensional variation range.
Outcome
Predicted sheet failure rate reduced from 7% to 0.5%
End effector validated through physical testing, zero sheet deformation, consistent grip across full assembly translation
Both subsystems designed, iterated, and physically validated from problem identification through prototype
Skills
Pneumatic Systems · End Effector Design · Tolerance Stack-Up · DFM · SolidWorks · Rapid Prototyping · First-Principles Design · Cross-Functional Collaboration
Detailed drawings and dimensional data withheld per NDA. Visuals shown are illustrative
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