AUTOMATED SKIP CHECKER DEVICE FOR SEWING MACHINE

摘要

In an automated skip checker device for sewing machine 1, a detector device 8 detects a slack portion 3a of a predetermined length D. The slack portion 3a definitely corresponds to a skip of a stitch or a disconnection of a sewing thread so as to unerringly carry out the detection with a high accuracy. The detector device 8 of the skip checker device has an air stream provider 19 which transfers a tension to an upper thread 3 as a pneumatic pressure to energize an optoelectronic switch 23 so as to make the detector device 8 structurally compact and cost-saving.