Compuprint 3056 - Manual (Page 16)

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3. For an easy installation of the ribbon Cartridge, turn the ribbon-tightening
knob in the direction of the arrow to tighten the ribbon. Then hold the
cartridge handle, make sure that the pegs of the cartridge fit over the
notches on each side of the printer. Gently press down the cartridge until
the hooks on the cartridge click into the notches. It shows as the following
figure:
4. Slide the ribbon between the print head and the septa and make sure the
ribbon is inside the channel and that it can move freely.