| 摘要 |
In a ribbon cartridge for retaining and supporting a ribbon in a typewriter, the cartridge comprising spaced apart top and bottom walls and a sidewall joining the top and bottom walls adjacent the periphery thereof to form a chamber. The sidewall of the cartridge is discontinuous at predetermined locations to form at least entrance and exit apertures for the ribbon, and at least a ribbon take up spool is provided in the chamber in communication with the ribbon entrance aperture to take up used ribbon passing through the entrance aperture. A ribbon shaper is provided in the entrance aperture, the ribbon shaper comprising a longitudinally extending base portion extending from the mouth of the entrance aperture inwardly into the chamber, the shaper including an upstanding and longitudinally diverging rib portion on the base portion, the rib portion including a planar upper surface which because of said the divergence is frusto-triangular in plan, the narrower portion of the upper surface lying adjacent the entrance aperture, and the diverging sidewalls on the rib portion extending from the upper surface to the base portion so that ribbon entering the entrance aperture tends to spread and flatten due to pressure exerted against the rib by tension in the ribbon and due to the divergence of the planar upper surface and the divergence of the sidewalls. |
