Line Stop

Introduction: Line Stop

A line stop is a mechanism used to halt a production line or process when deviations, defects, or safety risks are detected. It serves as a critical intervention in industries where product quality, process reliability, and safety must be assured, preventing problems from spreading further along the value chain.

Background

The concept of line stop originates from the Toyota Production System, where operators were empowered to stop production if abnormalities were found. This practice, known as jidoka or “automation with a human touch,” has since been adopted widely across manufacturing and other industries to strengthen quality control and safety.

Key Elements/Features

Line stops are characterised by several considerations:

• Detection mechanisms: Sensors, inspections, or measuring tools trigger the stop when issues are identified.
• Reasons for activation: Defective products, abnormal process conditions, or safety hazards.
• Types of line stops: Manual activation by operators or automatic intervention through control systems.
• Preventive and corrective measures: Root cause analysis and corrective actions ensure issues are resolved before production resumes.
• Impact on efficiency: While essential for quality, line stops may reduce output unless supported by fast problem-solving and effective systems.

Applications/Examples

Line stops are widely used in industries such as automotive, pharmaceuticals, food processing, and electronics, where quality and safety standards are non-negotiable. For instance, in automotive assembly, a line stop may be triggered if a part does not fit correctly, preventing downstream issues and costly recalls.

Relevance/Impact

Although line stops can temporarily affect productivity, they safeguard product quality, reduce long-term costs, and improve safety. By empowering employees and integrating detection systems, organisations ensure that problems are addressed at the source, reinforcing a culture of continuous improvement and accountability.

See also

• Jidoka (Autonomation)
• Andon System
• Build in Quality
• Poka Yoke