| 摘要 |
A roller for transporting and/or squeezing sheet-like photographic material has a metallic tubular core. The core has a cylindrical central portion of relatively large diameter and a pair of cylindrical ends of smaller diameter which constitute journals for the roller. The journals merge into the central portion via respective conical transition portions which widen in the direction from the corresponding journal to the central portion. The central portion and transition portions are surrounded by an annular coating of rubber or a synthetic resin. The core is produced by swaging the ends of a tube having the same diameter as the central portion of the core so as to form the journals and the transitions portions. The core obtained in this manner is coated by extruding or injection molding a synthetic resin, or by vulcanizing rubber, on to the same. The roller is lightweight, stable and inexpensive to manufacture. |
