| 摘要 |
PROBLEM TO BE SOLVED: To realize the easy change of the crossectional shape of a molding space by a method wherein a plurality of cartridges, which form a molding wall, are exchangeably installed in main body parts, which are annularly linked together, in at least either one of annular bodies. SOLUTION: A right and a left annular bodies are ones produced by joining a large number of liner units 21 through shafts 22. Each liner unit 21 consists of main body parts 23, which are connected through the shafts 22 with one another, and cartridges 24, which are exchangeably installed onto the main body parts 23. On the top surface of the main body parts 23, projections 23a are protrusively provided. On the under surface of the cartridge 24, engaging holes 24a, in each of which the projection is engagingly inserted, are bored so as to not easily get out of place when the cartridge 24 is placed on the main body part 23. The inner surfaces of the cartridges 24, oppose to each other, of the right and the left annular bodies 20 act as a molding wall 24. Cartridges 24 having various shapes are stored in the respective chambers of a storage warehouse. When a narrower molding space is intended, larger-sized cartridges 24 are mounted to the main body parts 23 in order to narrow the distance between the opposing molding walls 24. |
