CN101646819B

• Format: Patent
• Language: English
• Published: 30.11.2011
• Subjects: EMBROIDERING; SEWING; TEXTILES; TUFTING

The present invention provides a threader of a sewing machine in which the entire head portion can be made compact and the operator can perform threading work with one hand. The threader comprises: a threading shaft arranged near a needle bar for moving a supported sewing needle vertically; a threading hook for moving a hook portion in and out of a needle hole; a positioning member for regulating a lowermost position of the threading shaft to a position where the height of the hook portion matches that of the needle hole; a first rotary mechanism for rotating by a predetermined angle near the lowermost point of the threading shaft so that the hook portion is inserted into the needle hole of the sewing needle; and a thread-guiding member for guiding the top thread to the hook portion near the lowermost point of the threading shaft. The threader further comprises a second rotary mechanism for rotating by a predetermined angle so that a thread-catching portion of the thread-guiding member passes through the position of the needle hole of the sewing needle near the lowermost point of the threading shaft, and the first rotary mechanism and the second rotary mechanism rotate the threading hook and the thread-guiding member in opposite directions.