Patent ID: 9181644
Filing Date: 2015-11-10
Classification: D05B

Abstract:
1. A buttonhole presser device for stitching a buttonhole having a length corresponding to a diameter of a button by measuring the diameter of the button and automatically switching a fabric feed direction on the basis of the measured diameter of the button, the buttonhole presser device comprising: a fabric presser unit attached to a presser bar of the zigzag sewing machine and having an opening that allows a needle to pass therethrough; a fabric feed frame unit including a start position detecting member and an immovable receiving portion that has a frictional contact surface that contacts one end of a button, the fabric feed frame unit being slidable relative to the fabric presser unit between a start position and an end position of the buttonhole; a button-diameter measuring unit including an end position detecting member and a movable receiving portion that has a frictional contact surface that contacts the other end of the button, the button-diameter measuring unit being configured to grip the button by being slid relative to the fabric feed frame unit; and a fixing unit that fixes the button-diameter measuring unit to the fabric feed frame unit when the button-diameter measuring unit is gripping the button between the immovable receiving portion and the movable receiving portion and that allows the button to be removed after the button-diameter measuring unit has been fixed to the fabric feed frame unit.