Patent ID: 7677187

Claim:
A pattern generating mechanism of a sewing machine including a main shaft, a pattern needle swing cam group rotating in synchronism with the main shaft and composed of cams corresponding to each of a plurality of patterns, a pattern cam shaft supporting the pattern needle swing cam group, and a pattern selection cam capable of being manually operated to select a desired cam from the pattern needle swing cam group to generate needle swing movement for a utility pattern selected by the pattern selection cam, the pattern generating mechanism of a sewing machine, comprising: a pattern selection cam shaft provided independently of the pattern cam shaft and having the pattern selection cam mounted thereon; a button-hole cam mounted on the pattern selection cam shaft and generating a needle swing movement and a cloth feed movement for button-hole sewing; a drive gear rotated by rotation of the main shaft; a first follower gear engaging with the drive gear to rotate the needle swing cam group; and a second follower gear engaging with the first follower gear to rotate the button-hole cam.