Typing ribbon cartridge with blocking element

摘要

A cartridge for a typing ribbon comprises a container having a bottom with a series of seat openings provided at positions confronting a supply reel and a cover having a series of ribs which project into the container at positions confronting the reel. A blocking element comprises a flat plate of limited thickness having a series of dished portions capable of being forcibly fitted into the corresponding seat openings of the bottom to lift the supply reel and urge the upper edge of the ribbon against the ribs which prevents the turns from unwinding during storage and transportation of the cartridge. Channels co-operate with fixing elements on the machine and an opening 31 provides access for a sensing element. The blocking element comprises a first limb portion capable of covering the channel and the opening and a second limb portion capable of covering the channel in such a way as to prevent the cartridge from being mounted on the machine when the blocking element is mounted on the cartridge.