| 摘要 |
PURPOSE:To provide rigidity and strength for a steel belt by allowing the piston side of the steel belt used as piston rod to hold a steel-belt shaping member for maintaining the curvature of the steel belt. CONSTITUTION:A piston 2 is connected with a steel belt 5, and said steel belt 5 passes through a shaping guide part 6 for the steel belt, and the rectangular holes 7 of the steel belt 5 are engaged with the teeth part 9 of a sprocket 8 in a driving part. On the steel belt between the piston 2 and the shaping guide part, steel belt shaping pieces 17 made of ferromagnetic material such as iron, etc., are positioned in loosely fitted state and held on the steel belt shaping-part side by a relatively weak magnet 19 installed at the edge part of the shaping guide part 6, until said piece 17 is pushed and moved by a small projection 18 installed onto the steel belt.
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