The present invention provides a driving device for thread
cutting, presser foot lifting and needle
pitch adjustment, belonging to the technical field of sewing machines. It solves the problems such as reduced working efficiency of the existing device when meeting the requirements of driving thread
cutting, presser foot lifting and needle
pitch adjustment by one motor. The driving device for thread
cutting, presser foot lifting and needle
pitch adjustment includes a motor. A separately arranged thread cutting
cam, a presser foot lifting
cam and a needle pitch adjusting
cam are fixedly connected to the rotating shaft of the motor. Both the thread cutting cam and the presser foot lifting cam are
diamond-shaped, and the needle pitch adjusting cam is a curved
quadrilateral. The needle pitch adjusting mechanism abuts against the outer
peripheral wall of the needle pitch adjusting cam. When the effective needle pitch adjusting section of the needle pitch adjusting cam acts on the needle pitch adjusting mechanism, the thread cutting idle
stroke surface of the thread cutting cam acts on the thread cutting mechanism, and the lifting idle
stroke surface of the presser foot lifting cam acts on the presser foot lifting mechanism. This device meets the requirements of driving thread cutting, presser foot lifting and needle pitch adjustment by one motor and improves the working efficiency of the
sewing machine at the same time.