| 摘要 |
PROBLEM TO BE SOLVED: To prevent occurrence of troubles during side trimming. SOLUTION: A degree of contraction of a metal belt in a heat treating furnace in accordance with a read production instruction and a width contraction table which has been previously set (a2), the width of the metal band is measured (a3) and the width of the metal bank on the outlet side is estimated from the measured width and the degree of contraction. Then, the estimated width is compared with a desired width (a5), and side trimming is carried out if the estimated width exceeds the desired width. A distance Lr from a welding point at a position where the width is unsatisfactory is determined if the estimated width is smaller than the desired width (a), and if the distance Lr exceeds a determination distance, the side trimming is interrupted from an intermediate position (a8), but if the distance Lr to the position where the width is unsatisfactory is less than the determination distance LO, the side trimming is interrupted from the head part of the metal belt (a9). Accordingly, there is no risk of carrying out side trimming at a position where the width is unsatisfactory, thereby it is possible to prevent occurrence of troubles during side trimming.
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