| 摘要 |
A thread-tensioning device for being mounted on a bobbin housing, the bobbin housing having an upper part and a lower part which define a space for receiving a bobbin, and a jacket for substantially surrounding the bobbin. The thread-tensioning device includes a thread-tensioning member, such as a lever, having a first end swingably supported on the upper part of the housing, and a second end comprising a finger for bearing on the thread package on the bobbin. A central part of the lever is received by a slot in the jacket of the bobbin housing. A leaf spring bears upon the lever to urge the finger toward the interior of the bobbin-receiving space and against the thread package. The arrangement produces a detaining force and a braking force which combine to result in a relatively constant thread-tensioning force.
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