PRESSER-FOOT LIFTING AND LOWERING DEVICE FOR SEWING MACHINE

摘要

When lifting and lowering the presser-foot by either of the manual operation lever and the knee operation lifter, the composition of the lifting and lowering mechanism can be simplified, the number of parts can be reduced and the production can be performed easily. The present invention is provided with a presser bar lifting and lowering mechanism (30) which has: a lifter operating plate which is disposed upon a pedestal (2a) which supports an arm (2) upon a bed (3) and which is vertically movable depending on a vertical movement operation of a manual operation lever (31); a pivot rod in which one end is joined to the lifter operating plate via a first joining link; and a presser-foot bar lifting and lowering plate which is joined to a second joining link which is joined to the other end of the pivot rod, and which is joined to the presser-foot bar via a presser bar holder which is fixed to the presser-foot bar. The present invention is provided with a knee lifter mechanism (50) which is disposed upon a right lower end (3a) of the bed, which is equipped with a knee operation lifter (51), and which has a knee lifter drive arm which rotates by a swing of the knee operation lifter, wherein the knee lifter drive arm is joined to the lifter operating plate.

主权项

1. A presser-foot lifting and lowering device for sewing machine which lifts and lowers a presser-foot which is fixed at a slidable presser-foot bar in an arm head by either of a manual operation lever and a knee operation lifter for sandwiching a cloth which is sewed on a throat plate which is composed as one of a stitch forming device which is provided at an arm and a bed of a sewing machine and releasing the pressure, comprising:
a presser bar lifting and lowering mechanism having
a lifter operating plate which is disposed at a pedestal which supports said arm on said bed and which is vertically movable depending on a vertical movement operation of said manual operation lever,a pivot rod whose one end is joined to said lifter operating plate through a first joining link, anda presser-foot bar lifting and lowering plate which is joined to a second joining link which is joined to the other end of said pivot rod and which is fixed firmly at said presser-foot bar and is joined to said presser-foot bar, and further comprising: a knee lifter mechanism which has a knee lifter drive arm which is arranged at a right lower end of said bed and which attaches said knee operation lifter and rotates by the swing of said knee operation lifter, wherein said knee lifter drive arm is joined to said lifter operating plate.