LOWER-THREAD TENSION CONTROL DEVICE FOR SEWING MACHINE, AND SEWING MACHINE

WIPO Patent Application WO/2010/147023

A1

A lower-thread tension control device for a sewing machine, capable of finely and accurately controlling the tension of a lower thread without relying on frictional force. A lower-thread tension control device for a sewing machine comprises an outer shuttle (110), a middle-shuttle presser (130), a middle shuttle (150), a lower-thread tension control mechanism (200), a shuttle driving section (250), and a bobbin (300). A magnet section (190) is provided to the middle shuttle (150). A magnet section (270) is provided close to the magnet section (190), to an arm (260) provided to the rotating shaft of a shuttle driving motor (252) of the shuttle driving section (250). The middle shuttle (150) is rotated by rotating the magnet section (270) by means of the motor (252). Also, a magnet section (214) is provided to a rotating disc (210) which is provided to the rotating shaft of a lower-thread tension controlling motor (202) of the lower-thread tension control mechanism (200) so as to be close to the middle shuttle (150). A magnet section is provided to a portion of the bobbin (300), said portion being located on the rotating disc (210) side, and the bobbin (300) is rotated by the motor (202).

TAKIZAWA YOSHICHIKA (JP)
ONO MASAYOSHI (JP)
KURASHIMA TATSUHIRO (JP)

PCT/JP2010/059663

December 23, 2010

June 08, 2010

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NSD CORP (JP)
TAKIZAWA YOSHICHIKA (JP)
ONO MASAYOSHI (JP)
KURASHIMA TATSUHIRO (JP)

D05B59/00; D05B57/12; D05B57/14; D05B63/00

JPS6345237B2	1988-09-08
JPS6117736Y2	1986-05-30
JP2009061089A	2009-03-26
JP2008253449A	2008-10-23
JPH0568764A	1993-03-23
JP2008119078A	2008-05-29
JPH0568764A	1993-03-23
JP2008119078A	2008-05-29

See also references of EP 2444538A4

NAGAYA, Naoki (JP)
Naoki Nagaya (JP)

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