detectors in five systems the voice signals may be prepared in a manner that voice wave form of word according to human pronunciation is quantized in a certain sampling frequency the voice signal in the rom 15 is selectively read out in response to a command of the microprocessor 13 accordingly the microprocessor 13 together with the rom 15 constitutes a data generating circuit 24 the voice signal read out by the microprocessor 13 is transmitted to a d a converter 20 where the signal is converted into analog signal the converted analog signal is transmitted through a low pass filter 21 and an amplifier 22 to a speaker 1 disposed on the front surface of a bracket arm 2 thus voice is generated the data selecting and generating circuits may be constituted in a manner that human voices for warning are recorded in an endless tape and one selected voice in response to a selection command is regenerated by a regenerating device operation of an abnormal condition warning apparatus for a sewing machine will be described prior to sewing operation one stitch pattern is designated by the pattern selecting switches 23 and code signal of the designated pattern is transmitted from the pattern selection device 14 to the microprocessor 13.