Abstract: Two cylinder heads are disposed side by side. Upper side intake valve holes of one of the cylinder heads and upper side exhaust valve holes of the other of the cylinder heads are simultaneously machined by a multi-spindle head integrally including intake side tools and exhaust side tools. After moving the one of the cylinder heads upward by a pitch of the intake valves and moving the other of the cylinder heads upward by a pitch of the exhaust valves, remaining intake valve holes of the one of the cylinder heads and remaining exhaust valve holes of the other of the cylinder heads are simultaneously machined.

Abstract: A jaw fixation belt is gas permeable and comfortable to wear even in summer, can be securely fixed to the head even if the head or body moves when the wearer rolls over while asleep, for example, and is stretchable and properly fitted to the face. A jaw fixation belt according to the present invention, which is worn extending from the top of the head to the jaw, is provided with a first jaw fastening belt that fastens the jaw from the front side of the chin; and a second jaw fastening belt that fastens the jaw from the rear side of the chin, wherein a chin fixing portion in which one edge of the center of the first jaw fastening belt and the other edge of the center of the second jaw fastening belt are joined to each other is provided.

Abstract: A fixing tool for attaching an artificial ventilator includes a forehead-side fixing band 2 which is composed of a belt-like member made from a stretchable mesh cloth having multiple pores 1a formed therein and/or a belt-like member made from a stretchable cloth having a stretch rate of 140 to 180% and which can fix an artificial ventilator in a circumferential direction from the forehead through the head and a mouth-side fixing band 3 which can fix the artificial ventilator in a circumferential direction from the mouth through the neck. The forehead-side fixing band 2 and the mouth-side fixing band 3 are connected to each other by connection bands 4, 5 and 6 each being made from the same material as that of the mesh cloth.

Abstract: Two cylinder heads are disposed side by side. Upper side intake valve holes of one of the cylinder heads and upper side exhaust valve holes of the other of the cylinder heads are simultaneously machined by a multi-spindle head integrally including intake side tools and exhaust side tools. After moving the one of the cylinder heads upward by a pitch of the intake valves and moving the other of the cylinder heads upward by a pitch of the exhaust valves, remaining intake valve holes of the one of the cylinder heads and remaining exhaust valve holes of the other of the cylinder heads are simultaneously machined.

Abstract: Two cylinder heads (3, 3) are disposed side by side. Upper side intake valve holes (34a, 34c, 34e, 34g) of one of the cylinder heads (3) and upper side exhaust valve holes (35a, 35c, 35e, 35g) of the other of the cylinder heads (3) are simultaneously machined by a multi-spindle head (24) integrally including intake side tools (26a to 26d) and exhaust side tools (28a to 28d). After moving the one of the cylinder heads (3) upward by a pitch P1 of the intake valves and moving the other of the cylinder heads (3) upward by a pitch P2 of the exhaust valves, remaining intake valve holes (34b, 34d, 34f, 34h) of the one of the cylinder heads (3) and remaining exhaust valve holes (35b, 35d, 35f, 35h) of the other of the cylinder heads (3) are simultaneously machined.

Abstract: Two cylinder heads (3, 3) are disposed side by side. Upper side intake valve holes (34a, 34c, 34e, 34g) of one of the cylinder heads (3) and upper side exhaust valve holes (35a, 35c, 35e, 35g) of the other of the cylinder heads (3) are simultaneously machined by a multi-spindle head (24) integrally including intake side tools (26a to 26d) and exhaust side tools (28a to 28d). After moving the one of the cylinder heads (3) upward by a pitch P1 of the intake valves and moving the other of the cylinder heads (3) upward by a pitch P2 of the exhaust valves, remaining intake valve holes (34b, 34d, 34f, 34h) of the one of the cylinder heads (3) and remaining exhaust valve holes (35b, 35d, 35f, 35h) of the other of the cylinder heads (3) are simultaneously machined.

Abstract: Ball screws are moved axially to move a spindle unit in directions X, Y to position a cutter mounted on the spindle unit. Support arm assemblies which support the spindle unit are also moved. Then, a slide table which supports the support arm assemblies is moved in a direction Z to cause the cutter to machine a workpiece.