Circular stitching device for sewing machine

A circular stitching device for a sewing machine which executes a circular stitching while a workpiece cloth is turned about a cloth-fixing pin having passed through a workpiece cloth from above at a lateral position spaced away from a needle point by way of cloth feed by a feed dog, the circular stitching device comprising:

• a body base which is attachable to a sewing bed or an upper surface of a needle plate;
• a movable base which is provided on the body base so as to be movable in a predetermined direction;
• a cloth fixing member which includes the cloth-fixing pin which is passable through a workpiece cloth and is formed with an engagement portion, and a holder holding a proximal end of the cloth-fixing pin;
• a cloth-fixing pin support which is detachably attachable to the movable base thereby to support the cloth fixing member so that the cloth fixing member is detachably attachable thereto;
• and
• a locking unit which is provided on the cloth-fixing pin support and is disengageably engageable with the engagement portion of the cloth-fixing pin, thereby locking the cloth-fixing pin.