Backlash
Free spinning of the bobbin when the machine suddenly stops or slows. Metal bobbins have a greater tendency to spin and fly back when the machine stops. Some bobbin cases may have a backlash spring which acts as a braking device. When using sideless or paper bobbins, the backlash spring can sometimes push the bobbin too close to the hook, especially when damp weather causes it to swell. As a result, many operators prefer to remove this brake when using a prewound paper bobbin.
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