Abnormal condition warning apparatus for a sewing machine

In a sewing machine having stitch forming instrumentalities including a reciprocable and laterally joggable needle and a work-feed mechanism, a presser foot exchangeably mounted to the lower end of a presser bar and actuating means responsive to stitch data for imparting movement to said stitch forming instrumentalities to form a desired stitch pattern;

• the improvement comprising:
• a bar code attached to said presser foot;
• detecting means disposed in said machine for optically detecting said bar code and generating a detection signal representing said bar code;
• pattern selecting means for providing a pattern code signal corresponding to a desired stitch pattern of a plurality of predetermined stitch patterns;
• a static memory disposed in said machine for storing a plurality of groups of stitch data corresponding to said plurality of predetermined stitch patterns and speech data related to the unsuitability of said presser foot;
• a microprocessor operatively connected to said static memory for extracting one group of stitch data to be supplied to said actuating means from said static memory in response to said pattern code signal, said microprocessor being adapted to determine responsive to said detection signal and said pattern code signal whether or not said presser foot is suitable to form said desired stitch pattern and to extract said speech data from said static memory when said presser foot is unsuitable to form said desired stitch pattern;
• and
• electroacoustic means disposed in said machine for providing a voice sound responsive to said extracted speech data.