Abstract: A polishing apparatus includes a holding table for holding a workpiece thereon, a polishing head disposed above the holding table and having an acrylic plate for polishing the workpiece held on the holding table, a moving mechanism for moving the polishing head toward the workpiece held on the holding table, and a polishing water supplying unit for supplying polishing water between the acrylic plate and the workpiece held on the holding table.

Abstract: A cutting blade replacement apparatus includes a nut attaching-detaching unit including a nut holding part that holds a nut and a drive part that rotates the nut holding part. When the nut is screwed to a male screw formed at an end part of a boss part of a cutting unit, one of the nut attaching-detaching unit or the cutting unit moves in a Y-axis direction in synchronization with the speed of movement in the Y-axis direction due to the screwing of the nut, and the other of the nut attaching-detaching unit and the cutting unit escapes in the Y-axis direction when a pressing force equal to or larger than a predetermined value acts on the nut attaching-detaching unit or the cutting unit.

Abstract: The burner includes a first tube portion having a tube end including an ejection port and a second tube portion extending toward the ejection port in the first tube portion. The combustion gas generated by combusting air-fuel mixture is ejected from the ejection port. The second tube portion includes a heat exchanging portion that vaporizes liquid fuel with combustion heat of the combustion chamber and supplies the vaporized fuel to the premixing chamber. The outer surface of the second tube portion functions as a heat receiving surface of the heat exchanging portion. A fuel supply section of the burner is configured to vaporize liquid fuel and supply the vaporized fuel to the premixing chamber, and supply liquid fuel to the heat exchanging portion.

Abstract: The burner includes a first tube portion having a tube end including an ejection port and a second tube portion extending toward the ejection port in the first tube portion. The combustion gas generated by combusting air-fuel mixture is ejected from the ejection port. The second tube portion includes a heat exchanging portion that vaporizes liquid fuel with combustion heat of the combustion chamber and supplies the vaporized fuel to the premixing chamber. The outer surface of the second tube portion functions as a heat receiving surface of the heat exchanging portion. A fuel supply section of the burner is configured to vaporize liquid fuel and supply the vaporized fuel to the premixing chamber, and supply liquid fuel to the heat exchanging portion.