Patent ID: 8622009
Filing Date: 2014-01-07
Classification: D05B

Abstract:
1. A locking mechanism for a bobbin case for a lower thread bobbin to be received in a hook for a sewing machine, comprising: a bobbin case with a cover, a locking element to hold the bobbin case in the hook, a spring located on an arbor in the hook to eject the bobbin case with the bobbin from the hook, the cover of the bobbin case having a slot-shaped opening and a pivotally supported, two-arm locking lever arranged in the slot-shaped opening, the two-arm locking lever having a latching leg with a hook-shaped end adapted to engage a clearance groove in the bobbin arbor when the bobbin case is inserted into the hook against a force of the spring, the locking lever including a bore that is penetrated by a shaft, said shaft being located in a recess located on an outside of the cover and extending perpendicular to the slot-shaped opening, and being held in the cover by a torsion spring encompassing the shaft.