| 摘要 |
A needle feed sewing machine is provided to cut the corner portions which is the edges of the downstream and upstream portions of the horizontal bobbin case, thereby forming the chamfer portions. Transfer saw-teeth(51) have chamfers(53) formed by cutting the edges of a horizontal bobbin case. The chamfer passes through at least the center(P) of a needle hole(52) and has a slant portion with the slant started at the opposite side of the horizontal bobbin case compared to the line(L) along the transfer direction. The slant portion is formed by a curved shape or an arc shape. The transfer saw-tooth is formed by a rectangular shape roughly with the long side along the transfer direction at the plane view. The lower portion of the side wall is bent vertically toward the lower potion from the edge away from the horizontal bobbin case is detachably to the upper end of a transfer stand. Plural saw-teeth surfaces are formed on the upper surface of the transfer saw-teeth along Y-shaft direction vertical to the transfer direction.
|
