VAKUUM-MATRITZENBEFESTIGUNG.

摘要

A method and apparatus for mounting a die (62), particularly a rigid cutting die, on a die cylinder (22) includes having a bubble (116) along a seal (76) on the die to bridge any gaps between the die (62) and the die cylinder (22) when the die is initially positioned on the die cylinder (22). This bubble seal (76) enables a vacuum to be applied between the initially positioned die (62) and the die cylinder (22) to pull the die (62) down against and into conformity with the surface of the die cylinder, at the same time flattening the bubble seal (76). A key (68) at a trailing edge (66) of the die (62) locates in an axial keyway (50) in the die cylinder (22) to circumferentially position the die (62); a bolt (90) is then inserted at a leading edge (86) of the die (62) to establish axial location. During operation the die (62) is held in position by the vacuum. Beam sensors (56, 58) and light reflectors (52, 94) may be incorporated to sense when a wrong die (62) is present and shut down the apparatus. Ball valve members (150) may be incorporated in the surface of the die cylinder (22) to distribute the vacuum and also to enable the die (22) to be rolled along the surface of the die cylinder while initially being positioned.