Positioning structure for an eccentrically movable tongue seat

A positioning structure for an eccentrically movable tongue seat, wherein the tongue seat is provided on a cutter seat of a sewing machine, and a movable tongue is on the movable tongue seat;

• the positioning structure of the movable tongue seat comprising:
• an eccentric positioning member disposed between the movable tongue seat and the cutter seat, the eccentric positioning member being provided with a rotary end which is located toward one end of the cutter seat, wherein the eccentric positioning member rotates about the rotary end and is further provided with a drive end which is inserted in a slot of the movable tongue seat, the drive end and the rotary end are not coaxially aligned;
• and
• the movable tongue seat includes a pivot, the cutter seat includes a pivot hole for insertion of the pivot of the movable tongue seat, so that the movable tongue seat is able rotate on the cutter seat by rotating about the pivot, when the eccentric positioning member rotates about the rotary end, the drive end can push the movable tongue seat to rotate about the pivot to a desired position.