23-05-2013 дата публикации
Номер: US20130125802A1
There is provided a needle thread tension controller that can control a magnitude of tension on a needle thread for each stitch, that can draw the needle thread with a slim chance of occurrence of a thread break, that easily, accurately detects occurrence of the thread break when the thread break has occurred, and that does not cause any excess or deficiency of a quantity of accumulated thread, which would otherwise be caused by drawing a needle thread. There are provided an upstream grip section and a downstream grip section for gripping a needle thread and a turning section for turning the needle thread. In a torque control zone, rotating force is imparted to a turning arm in accordance with a torque value. 1. A sewing machine comprising:{'b': 12', '12', '1', '12', '9, 'i': a', 'a', 'a, 'a thread take-up lever (, - to -) formed in a swayable manner;'}{'b': 30', '230, 'claim-text': [{'b': 40', '240', '1240', '41', '241', '1241', '50', '250, 'an upstream grip section (, , ) which includes an upstream grip section main body (, , ) for pinching to thereby grip a needle thread and an upstream actuation section (, ) for switching, with respect to the upstream grip section main body, between a closed state in which the needle thread is gripped and an open state in which a needle thread is released from a gripped state,'}, {'b': 60', '260', '1260', '61', '261', '1261', '70', '270, 'a downstream grip section (, , ) which is disposed at a downstream position on a needle thread path of the upstream grip section and which includes a downstream grip section main body (, , ) for pinching to thereby grip a needle thread and a downstream actuation section (, ) for switching, with respect to the downstream grip section main body, between a closed state in which the needle thread is gripped and an open state in which the needle thread is released from a gripped state, and'}, {'b': 80', '280', '1280', '81', '281', '1281', '86', '286', '1286, 'a turning section (, , ) which turns the ...
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