| 摘要 |
PROBLEM TO BE SOLVED: To provide a device and a method for detecting the residual amount of a roll sheet capable of accurately detecting the residual amount in the state of non-contact even when the rotation. of the roll sheet is unstable. SOLUTION: A rotation is detected, by a photo sensor 19 from a rotary encoder 18 installed on a feed roller 26, pulses are output, and an averaged angular velocity of the feed roller 26 is detected, by a control part having an A/D converter, a CPU, ROMs and RAMs, and a timer, from a plurality of pulse outputs detected by the photo sensor 19. When the averaged angular velocity of the feed roller 26 is detected to reach a specified value, the residual amount of a roll sheet 27 is alarmed by a residual amount warning lamp. Thus even if the roll sheet is such that a rotating speed is changed, largely such as a highly adhesive laminate film for cold laminate, the residual amount can be detected accurately and an alarm can be given properly to users.
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