| 摘要 |
In an ink delivery system for use in a typing machine or similar printer a reversible typing ribbon cartridge including two pairs (50, 52) of ribbon drive pinch rollers each pair comprising a driver roller (56, 62) and an idler roll (58, 64) journaled on a movable axis. The pairs of pinch rollers serve to move the reversible typing ribbon (22) in the direct and inverted orientations respectively. When the cartridge (18) is off the typing machine both pairs (50, 52) of pinch rollers are engaged with the ribbon (22), but as the cartridge (18) is installed and hold in a fixed position, a rod-like displacing element (84) affixed to a cartridge platform (16) of the typing machine (10) penetrates into the cartridge and disengages the pair (52) of pinch rollers in the following position while drives engage both the ribbon storage spool (34) and the pair (50) of pinch rollers in the leading position. |
