Sewing machine with needle threading device

Abstract

A sewing machine with needle threading device is disclosed, wherein the thread passed through the needle eye of a needle of the sewing machine by operation of a threading hook may be released from the threading hook during a process of the threading hook moving up to the upper initial position after the threading operation is finished. More precisely, the sewing machine comprising a threading shaft having a threading hook mounted to the lower end thereof, a control means CPU for providing a descending process wherein the threading shaft is moved down from an upper initial position to a lower threading position where the threading hook is operated to catch a thread to pass the thread through the needle eye and an ascending process wherein the threading shaft is moved up from the lower threading position to the upper initial position, the ascending process including an initial process wherein the threading shaft is moved up a predetermined distance from the lower threading position to pull up the threaded thread, a second process wherein the threading shaft is moved down a predetermined distance after the initial process to have the threading hook release the threaded thread and a final process wherein the threading shaft is moved up to the upper initial position after the second process while said threaded thread is released from said threading hook