Knee operated lifting mechanism for a presser foot of a sewing machine

A knee operated lifting mechanism for a presser foot of a sewing machine being fixed on a body of the sewing machine, the body being provided with a presser-foot shaft, the knee operated lifting mechanism is drivingly connected to the presser-foot shaft, so as to consequently drive the presser foot to move up and down, the knee operated lifting mechanism comprising:

• a knee pushing device including a knee pushing plate to be operated by a user;
• a cable drivingly connected to the knee pushing plate and the presser-foot shaft;
• a lifting device includes a pivoting member inserted on the presser-foot shaft, and a lifting member, the presser-foot shaft is inserted in and drives the pivoting member to rotate, the pivoting member includes a first abutting surface, a distance from a center of the pivot hole to the second abutting surface is defined as a first distance which is great enough to allow the presser foot to move upward, the lifting member includes an abutting portion and a drive portion connected to the abutting portion, the drive portion drives the presser foot to move, when the presser foot moves upward, the abutting portion is abutted against the first abutting surface;
• by such arrangements, pushing the knee pushing plate controls the cable to pull the presser-foot shaft and the rotary member to rotate, then the drive shaft rotates the presser-foot shaft to make the first abutting surface press against the abutting portion, and then the lifting member is caused to push the presser foot to move upward.