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Hook for lockstitch sewing machine comprising at least one tension spring to create a stable tension of the bobbin thread
Hook for lockstitch sewing machine comprising at least one tension spring to create a stable tension of the bobbin thread
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机译:锁式缝纫机的钩子,包括至少一个拉簧,以产生稳定的梭芯线张力
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摘要
Hook (11, 12, 13, 14) for a lockstitch sewing machine, or parts of the hook such as the support element of the tension spring (in particular the basket or the bobbin case) or the tension spring itself, including a tension spring (80, 90, 100, 110, 120) that includes a bending towards the outside (with respect to the support element on which it is mounted and with respect to the main bending radius of the tension spring) of the tension spring's extremity designed to press on the bobbin thread, so that the pressure point (P) on the bobbin thread is the point of tangency between the bending radius (R) of the bending of the tension spring's extremity and the support element of the tension spring, so as to generate a stable tension of the bobbin thread.
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