Length measuring device of band-shaped material to be carried

Abstract

Abstract PURPOSE:To improve the precision of length measurement, by using two photodiode array cameras and selecting measured values at the time when the difference between the timing of acquisition of the front edge of a band-shaped material due to the lower-side camera and that of the rear edge of the band- shaped material due to the upper-side camera is minimum and defining the addition value as a length measured value. CONSTITUTION:Photodiode array cameras 1 and 2 are arranged along a carrying path of a band-shaped material T1 above a conveyor 6, and an operating device 5 is provided. Measurement signals or the like issued from both cameras 1 and 2 are operated to select measured values at the time when the difference between the timing of acquisition of the front edge of the band-shaped material T1 due to the lower-side camera 1 and that of the rear edge of the band-shaped material T1 due to the upper-side camera 2 is minimum, namely, at the time when both edges are acquired almost simultaneously, and the addition value based on these measured values is defined as a length measured value L of the band-shaped material T1. Thus, the inevitable error due to movement of the moving band-shaped material T1 is reduced to the minimum.

Inventors

• 👤 Tsutomu Kitamura
• 👤 北村　務
• 👤 Tatsuo Furuichi
• 👤 古市　達雄

Bibliographic Details