Abstract: A device is provided with a first die, a second die and a pressing machine. The second die is provided with a plastic processing hole where a core metal is disposed on a hole center line. On the inner peripheral surface of the plastic processing hole, three projecting portions are provided at regular intervals in the circumferential direction of the hole center line. By the approach of the first and second dies to each other, the core metal is inserted into a guide hole of a contact tip, and the projecting portions plastically deform the head end side of the contact tip by pressing it until it is in contact with the core metal.

Abstract: A device is provided with a first die, a second die and a pressing machine. The second die is provided with a plastic processing hole where a core metal is disposed on a hole center line. On the inner peripheral surface of the plastic processing hole, three projecting portions are provided at regular intervals in the circumferential direction of the hole center line. By the approach of the first and second dies to each other, the core metal is inserted into a guide hole of a contact tip, and the projecting portions plastically deform the head end side of the contact tip by pressing it until it is in contact with the core metal.

Abstract: On an inner peripheral surface defining a through hole of a first rotator, provided is a positioning member for bringing the center axis of a contact tip, housed in the through hole, into alignment with a rotational axis, or making the former axis proximate to the latter axis, by coming into contact with an outer peripheral surface of the contact tip.

Abstract: Disclosed herein is a rotary changer including a rotator rotatable on a rotational axis extending vertically. An interlocking member is arranged to rotate integrally with the rotator and be movable in a direction intersecting with the rotational axis. The interlocking member has an interlocking groove interlockable with an outer peripheral surface of a nozzle inserted into the hollow of the rotator. Rotating the rotator with the interlocking member interlocked with the nozzle makes the nozzle replaceable.

Abstract: A moving mechanism brings the rotational axis of each driven rotator into alignment with the rotational axis of a drive rotator, which has an engaging face extending along its rotational axis. Each driven rotator has an engageable face extending along the rotational axis of the drive rotator. Rotating the drive rotator while moving the driven rotator, of which the rotational axis is aligned with the rotational axis, toward the drive rotator will bring the engaging face into engagement with the engageable face.

Abstract: A moving mechanism brings the rotational axis of each driven rotator into alignment with the rotational axis of a drive rotator, which has an engaging face extending along its rotational axis. Each driven rotator has an engageable face extending along the rotational axis of the drive rotator. Rotating the drive rotator while moving the driven rotator, of which the rotational axis is aligned with the rotational axis, toward the drive rotator will bring the engaging face into engagement with the engageable face.

Abstract: On an inner peripheral surface defining a through hole of a first rotator, provided is a positioning member for bringing the center axis of a contact tip, housed in the through hole, into alignment with a rotational axis, or making the former axis proximate to the latter axis, by coming into contact with an outer peripheral surface of the contact tip.