| 摘要 |
A ribbon cartridge having a self-contained ratchet assembly and drive gear assembly. Three principal components are provided: a drive gear; a ratchet gear spool connected by a ring gear formed thereon to the drive gear; and a take-up spool having internal teeth which are rotatably mounted on a ratchet formed on the external diameter of the ratchet gear spool. The drive gear is driven by a simple printer motor at a constant speed, which, in turn, drives the ratchet gear spool at a constant speed. This action, in turn, drives the take-up spool through the flexible plastic ratchet at a speed that varies with the amount of ribbon accumulating on the take-up spool.
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