Switching device of a double-function sewing machine

摘要

A double-function sewing machine, which is provided with a lock stitch forming mechanism and an overlock stitch forming mechanism, has a common driving source and a common flywheel for the two mechanisms. The sewing machine is provided with a switching device which includes a switch key connected to the flywheel of the machine. The switch key is selectively switchable to engage the shaft of the lock stitch-forming mechanism or a drive of the overlock stitch-forming mechanism. The switching device further includes a switching pawl which is engageable with and disengageable from the drive of the overlock stitch forming mechanism to hold the latter when the lock stitch forming mechanism is operated.