TEMPERATURE DETECTING DEVICE AND TEMPERATURE DETECTING METHOD FOR RUNNING YARN

摘要

PROBLEM TO BE SOLVED: To provide a temperature detecting device and a temperature detecting method for a yarn capable of accurately detecting the temperature of the running yarn with high sensitivity in no contact. SOLUTION: This temperature detecting device for the running yarn receiving the infrared light irradiated from the running yard with an infrared sensor via an incident section comprises a light collecting means 15 located between the incident section 12 and the infrared sensor 14 and collecting the infrared light received from the incident section 12 toward the infrared sensor 14 and a reflecting mirror 3 arranged at an interval from the incident section 12 and having a reflecting face facing the incident section. A space 4 for passing the running yard is formed between the incident section 12 and the reflecting mirror 3. The infrared light irradiated from the running yarn Y is directly guided to the infrared sensor 14 via the light collecting means 15 and indirectly guided to the infrared sensor 14 via the reflecting mirror 3 and the light collecting means 15.