Why Should I Use a Stop Time Analyzer

Where Do I Mount My Light Curtains?

After a company purchases their Safety Light Curtains, a complex list of questions are presented:

• Where should I mount my light curtains?
• What is the “Stop Time” of the machine?
• How do I find the “Stop Time” of the machine?
• What is the “Safety Distance” of the machine?
• What is the “Depth Penetration Factor” of the light curtains?

These are a just a few of the questions confronting Safety Coordinators and Manufacturing Engineers around the world when making critical safety decisions.

Let Jokab Safety answer those questions and provide you with a solution to reduce the time and cost associated with Safety Distance measurements.

Whether you are upgrading safety devices to an older machine or adding them to a new one, you must know the “Stop Time” of the machine. If your light curtains are placed too close to a “Hazardous” or “Nip” point, the operator may be seriously injured if he or she reaches into the machine after the cycle has been initiated (“After Grasp”). The light curtain location on the machine is critical. When the light curtains are installed too close to the “Point of Operation” the machine may drift after the stop signal has been given, allowing the operator’s hand to reach the “Nip” point before the machine comes to a complete stop. When the Light curtains are placed too far from the “Point of Operation”, you create access points in the safety zone and must add additional measures to protect the operator. Valuable real estate is also compromised by designing a larger than necessary safety zone.

Documentation – Meets OSHA, RIA, ISO and CSA Standards

Jokab Safety North America has a solution for all of your Stop Time and Motion Analysis and documentation. It is a SMART product that allows you to measure the “Stop Time” of your equipment such as Part Revolution Presses, High Speed Transfers, Lifters, Turntables, Conveyors, Robots, etc. SMART then allows you to calculate the “Safety Distance” (S) using the “Stop Time” (T) of the machine, the “Depth Penetration Factor” of the safety device (DPF) and the hand speed of a technician (K). Based on the safety standard Machinery Directive EN 999:1998, the safety distance is S = KT + DPF.

Smart then creates a printout of that machine’s motion, the “Stop Time” measurement and it’s “Safety Distance” on a convenient document which can be stored for design, reference and safety audits.