Pressure foot unit for sewing machine

摘要

In a presser foot unit for a sewing machine, a holding member including a presser foot holding knuckle is provided. A presser foot having a pair of knuckles at the back end of the presser foot is also included. The knuckles on the presser foot are spaced apart to receive the presser foot holding knuckle. A presser foot support pin extends through the pair of knuckles on the presser foot and also through a groove in the presser foot holding knuckle, thereby mounting the presser foot to the holding member such that the presser foot can pivot about the support pin. The presser foot holding knuckle also forms curved protrusions that engage the pair of knuckles on the presser foot, such that the presser foot is constrained from moving laterally relative to the holding member. In addition, a spring is supported by the holding member for biasing the presser foot against a piece fabric during operation of the sewing machine. The spring includes an arm portion having a bent extremity that is inserted in a first opening formed in the holding member. Another longer arm portion of the spring engages the presser foot.