Device for detecting fabric thickness of a sewing machine

摘要

A detecting device for detecting a thickness of a fabric inserted between a presser foot and a needle plate of a sewing machine includes an electric iron core having an electric coil and inserted at a space between the needle plate and the fabric presser foot, into which a fabric under stitching is fed. Said space is changed by the fabric thickness. The device detects a change in said space and calculates a length of the changed space.