| 摘要 |
A button-hole earn is mounted on a pattern selection cam shaft for mounting a pattern selection cam, the pattern selection cam shaft provided independently of a pattern cam shaft provided with a needle swing cam group. The rotation of a sewing machine main shaft causes rotation of a drive gear which in turn rotates a first follower gear in engagement with the drive gear and a second follower gear engaged with the first follower gear. Thus, the rotation of the first follower gear causes rotation of the needle swing cam group whereas the rotation of the second follower gear causes rotation of the button-hole cam. Thus, a pattern selected among a plurality of patterns by a pattern selection dial is generated to form button-hole stitches selected by the pattern selection dial.
|
