Tape remaining amount detection device

Abstract

Abstract PURPOSE:To prevent a tape from being damaged at the time of fitting it and enable to prevent mis-detection, by a method wherein an optical detecting means of the trailing end of a tape is provided on the inside of a core of a supplying- side roll in a detector of the trailing end of an ink ribbon or the like. CONSTITUTION:In a cassette casing 18 formed of a transparent material, a fresh ink ribbon 3 wound around a core 19 made of a transparent material is taken up by a core 20 through rollers 5, 6 as a used ribbon 8. On the other hand, a center pole 22 projected on a carriage 21 is provided with an LED11 and a polarizing filter 12 therein, and is located in the core 19. A detecting part 24 consisting of a light-receiving element 13 is provided on the outside of the cassette casing 18, and the latter is provided with a cutout as a light-passing window 24a. Therefore, when a large amount of ribbon is wound, the light emitted from the LED11 is shielded by the fresh ribbon 3, although it passes through the filter 12, the window 22a and the transparent core 19. When a transparent part provided at the trailing end of the ribbon comes to position, it is detected by the element 13. Accordingly, even when a lack of ink is present at a part of the ribbon, mis-detection can not occur.

Inventors

• 👤 Mineo Nozaki
• 👤 野崎　岑生
• 👤 Osamu Asakura
• 👤 修 朝倉
• 👤 Yoshiro Uchikata
• 👤 佳郎 打方
• 👤 Masazumi Nagashima
• 👤 長島　正澄

Bibliographic Details