DISPLAY OF REMAINING TAPE LENGTH

PURPOSE:To display the remaining tape length when the tape is traveling not at a constant speed, by driving the tape at a constant speed and alternating the travel not at a constant speed to the travel at a constant speed and then displaying the remaining tape length on the basis of the rotational cycle of a reel, the thickness of the tape and the diameter of a reel hub respectively. CONSTITUTION:When a tape is traveling at a constant speed, a tape residue detecting circuit 10 calculates the residue of the tape based on the rotational cycle of a feed reel which is detected by a rotation detector 7, the thickness of the tape obtained by a tape thickness signal producing circuit 8, and the diameter of a tape reel obtained by a hub diameter signal producing circuit 9 to display the remaining tape length at a display circuit 11. While the remaining tape length display switch 1 is operated when the tape is traveling at speed different from the constant value, a constant speed traveling state is secured via a traveling control circuit 3, a latch circuit 2, etc. to display the remaining tape length. Then the tape is rewound back to the starting position of the constant speed traveling to be stopped there. In such a way, the remaining tape length can be displayed also except when the tape is traveling at a constant speed.