Upper thread detection circuit, sewing machine control circuit and sewing machine

• Main Authors: CHANG HONGWEI, TONG PING'AN, XING SHAOPENG
• Format: Patent
• Language: Chinese; English
• Published: 27.09.2022
• Subjects: EMBROIDERING; SEWING; TEXTILES; TUFTING

The embodiment of the utility model provides an upper thread detection circuit, a sewing machine control circuit and a sewing machine, the upper thread detection circuit comprises an upper thread optocoupler detection unit for generating a pulse signal, and an upper thread passes through the optocoupler detection unit; the first square wave generation unit is connected with the output end of the upper line optocoupler detection unit so as to convert the pulse signal into a first square wave signal; the D trigger and the clock signal end are connected with the output end of the first square wave generation unit so as to generate an upper thread breakage detection signal, and in the sewing process, the circuit can find whether an upper thread is broken or not in time, line missing and stitch abnormity caused by detection lag in the sewing process are avoided, and the sewing quality is improved. 本实用新型实施例提供一种面线检测电路、缝纫机控制电路及缝纫机，所述面线检测电路包括：产生脉冲信号的面线光耦检测单元，面线从所述光耦检测单元中穿过；第一方波产生单元，与所述面线光耦检测单元的输出端连接，以将所述脉冲信号转换为第一方波信号；