Rotary hook for sewing machine
AssigneeNecchi Societa per Azioni
InventorNereo Bianchi
Life of this patent
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Abstract
A hook for a sewing machine comprising a hook body, a bobbin case holder arranged in the hook body, a bobbin case arranged in the bobbin case holder and a bobbin in the bobbin case. The bobbin case holder has a bottom wall from which extends a pin. The pin is provided with resilient check elements. A pin portion extends centrally from a bottom wall portion of the bobbin case defining a hole therein having a shape suitable to provide together with the pin of the bobbin case holder a locking system to lock the bobbin case to the bobbin case holder. A lever is positioned in the hole to ensure locking and release of the bobbin to and from the bobbin case. The bobbin is inserted in the bobbin case so as to close it upwardly.
Claims3
A hook for a sewing machine comprising a hook body, a bobbin case holder arranged in said hook body, a bobbin case arranged in said bobbin case holder, a bobbin in said bobbin case, said bobbin case holder having a bottom wall from which extends a pin, said pin defining an upper portion of greater diameter than the remainder of the pin and having slits therein extending longitudinally for a large portion of the length of the pin, a hollow pin extending centrally from a bottom wall portion of said bobbin case defining a hole therein having two different diameters suitable to provide together with said pin of said bobbin case holder a locking system to lock said bobbin case to the said bobbin case holder, and lever means positioned in said hole to ensure locking of said bobbin in the bobbin case during sewing and to facilitate removal and insertion of the bobbin case from and in the bobbin case holder when bobbin change is requested.
Dependencies are inferred from the claim text.