Patent ID: 6742466
Filing Date: 2004-06-01
Classification: D05B,D05D

Abstract:
A sewing machine with needle threading device which is automatically operated to thread an needle eye of a needle attached to the lower end of a vertically reciprocating needle bar, said sewing machine comprising a threading shaft having a threading hook mounted to the lower end thereof, a control means for providing a descending process wherein said threading shaft is moved down from an upper initial position to a lower threading position where said threading hook is operated to catch a thread and pass the thread through said needle eye and an ascending process wherein said threading shaft is moved up from said lower threading position to said upper initial position, said ascending process including an initial process wherein said threading shaft is moved up a predetermined distance from said lower threading position to pull up the threaded thread, a second process wherein said threading shaft is moved down a predetermined distance after said initial process to release the threaded thread from said hook and a final process wherein said threading shaft is moved up to said upper initial position after said second process while said threaded thread is released from said threading hook.