Monitoring wear or likelihood of fracture of vibrating leaf springs for cigarette cutting machine - passing measurement current between contacts on spring contg. electrically conductive reinforcing fibres and sensing voltage change as indicative of rupture.

摘要

The method involves passing an electrical measurement current through the leaf spring and detecting a measurement parameter of the current influenced by wear or likelihood of fracture as a voltage change. The measurement parameter can be the current dependent voltage drop across the spring. The spring can contain electrically conducting reinforcement elements, e.g. carbon fibres, and carry two mutually insulated electrical contacts (6,7) on one side and one (9) on the other. The current flows from one of the two contacts to the one on the other side and back to the other of the two contacts. USE/ADVANTAGE - Monitoring machine for mfg. rod-shaped articles eg cigarettes in tobacco industry. Enable indicative signals to be formed and evaluated before fracture occurs.