Patent ID: 8955446
Filing Date: 2015-02-17
Classification: D05B

Abstract:
1. A thread cutting mechanism mounted on a sewing machine, the sewing machine comprising a sewing platform, the thread cutting mechanism comprising: a driver assembly, comprising a stepping motor, a swing lever pivotally connected to the stepping motor, and a pushing rod connected to the stepping motor and the swing lever and driven jointly with the swing lever by the stepping motor to perform a back-and-forth process; wherein the swing lever comprises a pivotal connection portion connected to the stepping motor, and a swing portion connected to and driven by the pushing rod to rotate about the pivotal connection portion serving as a fulcrum; and a thread cutting assembly, disposed on the sewing platform, comprising a thread hooking blade connected to and driven by the swing portion to move back-and-forth along a thread hooking path and to hook back a sewing thread, and a thread cutting blade disposed on the thread hooking path and for cutting the sewing thread when the thread hooking blade hooks back the sewing thread; wherein the thread cutting blade comprises a cutting portion disposed at one edge thereof, and an opening formed along the thread hooking path; the thread hooking blade comprises a penetration portion penetrating through the opening and abutting against a wall of the opening to drive the thread cutting blade when moving, and a thread hooking portion disposed below the cutting portion and for hooking back the sewing thread.