| 摘要 |
PROBLEM TO BE SOLVED: To inform a user of a replacement of a knife before the knife is worn out or chipped, thereby preventing a cloth cutting failure. SOLUTION: The buttonholing machine includes stress detection means 20 for detecting a stress applied to a knife when forming a buttonhole, cumulating means 20 for cumulating, each time the buttonhole is formed, the stress detected by the stress detecting means, storing means 24 for storing a threshold stress that causes a wear-out or a breakage of the knife, and informing means 66 for informing a user of a replacement of the knife. When the cumulated stress reaches the threshold stress, the control means controls the informing means to inform the user of the replacement of the knife. COPYRIGHT: (C)2010,JPO&INPIT
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