Abstract: A method and an apparatus for manufacturing a spark plug. A bending apparatus includes a bending unit having a preliminary bending unit and a main bending unit, and a gap adjusting unit. The main bending unit including pressing unit for pressing a distal end of a ground electrode toward a center electrode, and a gap adjusting unit configured to adjust a relative height position of the distal end of the ground electrode relative to a distal end of the center electrode in an axis line direction. The gap adjusting unit includes a gap adjusting unit for relatively moving the distal end of the ground electrode relative to the center electrode in a direction substantially perpendicular to the axis line direction, and a restricting unit for restricting relative movement of the distal end of the ground electrode relative to the center electrode in the axis direction.

Abstract: A method and an apparatus for manufacturing a spark plug. A bending apparatus includes a bending unit having a preliminary bending unit and a main bending unit, and a gap adjusting unit. The main bending unit including pressing unit for pressing a distal end of a ground electrode toward a center electrode, and a gap adjusting unit configured to adjust a relative height position of the distal end of the ground electrode relative to a distal end of the center electrode in an axis line direction. The gap adjusting unit includes a gap adjusting unit for relatively moving the distal end of the ground electrode relative to the center electrode in a direction substantially perpendicular to the axis line direction, and a restricting unit for restricting relative movement of the distal end of the ground electrode relative to the center electrode in the axis direction.

Abstract: A method and apparatus for manufacturing a spark plug, the spark plug being defined herein, the method including a center electrode position measuring step of measuring an X-directional position of the front end of the center electrode; a regulation member positioning step of positioning an X-directional position of a regulation member based on the X-directional position of the front end of the center electrode measured in the center electrode position measuring step, the regulation member regulating an X-directional position of a front end surface of the ground electrode when the ground electrode is pressed and bent in a Y direction; and a gap forming step of using the regulation member to regulate the X-directional position of the front end surface of the ground electrode while pressing and bending the ground electrode in the Y direction so as to form the spark discharge gap; wherein: the X direction and the Y direction are as defined herein.

Abstract: A method and apparatus for manufacturing a spark plug, the spark plug being defined herein, the method including a center electrode position measuring step of measuring an X-directional position of the front end of the center electrode; a regulation member positioning step of positioning an X-directional position of a regulation member based on the X-directional position of the front end of the center electrode measured in the center electrode position measuring step, the regulation member regulating an X-directional position of a front end surface of the ground electrode when the ground electrode is pressed and bent in a Y direction; and a gap forming step of using the regulation member to regulate the X-directional position of the front end surface of the ground electrode while pressing and bending the ground electrode in the Y direction so as to form the spark discharge gap; wherein: the X direction and the Y direction are as defined herein.