Flipped Tape Detector
Original Publication Date: 1987-Aug-01
Included in the Prior Art Database: 2005-Feb-01
The conductivity of chrome oxide is employed to detect whether tape coated on one side has been flipped over. Where the tape medium is a nonconductive substrate coated on one side with chrome oxide, the oxide coating has some conductivity, while the uncoated side has nil. This property is utilized to detect whether the tape is being correctly wound. Two spring contact probes are mounted in a nonconductive holder. The probe holder is mounted on an air cylinder. The probes are brought into contact with the medium, just prior to winding. If infinite resistance is detected, this is interpreted as a flipped medium, and the winder is stopped and waits for corrective action. If resistance is detected, the winder is threaded correctly and operation continues.