Abstract: A sewing machine including a laterally extending shaft with a cam contactor thereon being rocked by an eccentric cam assembly secured at a hook drive shaft provides an end face cam at its end such that a sliding shaft with a feed dog assembly thereon and contacting with the end face cam is slid laterally. Thereby, the feed dog is moved laterally, leftwardly or rightwardly, depending on the shifting of the cam contactor. The eccentric cam assembly comprises two eccentric cams configurated opposite in phase and formed such that leftward feed or rightward feed is selectively enabled, and a circular cam which causes no lateral feed. Shifting of the contactor to the selected cam is performed by a solenoid via a linkage system.