Andon

Definition

Andon is a visual management system used in manufacturing facilities to immediately notify managers, maintenance personnel, and workers of quality issues or process abnormalities. Derived from the Japanese word for 'lantern', this term represents a core element of the Toyota Production System (TPS), enabling immediate response when problems occur.

Application in Manufacturing

Operation Methods

• Manual Activation: Workers pull a cord or press a button to manually trigger alerts
• Automatic Activation: Production equipment automatically initiates notifications when detecting abnormalities
• Production Pause: May include functionality to stop the line until issues are resolved

Signal Display Methods

• Stack Lights: Color-coded status indication (green-normal, yellow-caution, red-stop)
• Audio Alarms: Auditory alerts for immediate recognition
• Digital Displays: Text or graphics providing detailed information
• Dashboards: Central monitoring of andon status across the entire factory

Integration with AI Technology

Smart Andon Systems

Modern manufacturing is evolving toward AI-based predictive andon:

• Predictive Alerts: Machine learning detects early signs of equipment abnormalities, alerting before failures
• Pattern Analysis: Analyzes andon occurrence data to identify root causes of recurring problems
• Automated Prioritization: AI evaluates problem severity to determine response order
• Mobile Integration: Real-time notifications and remote response via smartphones

Real-World Applications

On automotive assembly lines, when a worker detects a faulty torque wrench, they press the andon button, temporarily stopping only that zone until the team leader arrives and resolves the issue. AI systems learn these andon occurrence patterns to predict recurring problems with specific tools or processes.

Key Points

• Immediate Visualization: Creates a culture of transparency rather than hiding problems
• Rapid Response: Prevents small issues from escalating into major defects
• Continuous Improvement: Accumulated andon data provides foundation for process improvement
• Quality First: Practical tool for implementing philosophy that prioritizes quality over production speed