| 摘要 |
In a zigzag sewing machine, the overstitch width is varied by a control device, the device includes a needle bar frame being oscillatable about an axis on the machine and reciprocably supporting a needle bar therein, a negative cam means is secured on the main drive shaft and engages said needle bar frame, a tape means running in the device has a number of series of variable number of perforations and a series of varying length follower means on said needle bar frame is engageable said series of perforations facing the follower means so that the fall of the needle bar frame is limited in proportion to the number of perforations in said series facing the follower means.
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