Ribbon feed mechanism and correction tape feed mechanism for a typewriter

Claim 1

A ribbon feed mechanism, in combination with a single element impact printer having a print line and having a cyclically operable shaft, said printer being cyclically operable in print and correction modes, said mechanism capable of accepting a cartridge containing a printing ribbon and a correction tape, said combination operative to feed said printing ribbon and correction tape in said cartridge, said cartridge comprising superimposed supply spools; and superimposed take up spools having spatially fixed axes with respect to said cartridge, said take up spools respectively for receiving used ribbon and supporting a ribbon disc and for receiving used tape and supporting a tape disc, said ribbon feed mechanism comprising: a holder for said cartridge mounted on said typewriter for cyclically controlled oscillation of said holder and said cartridge to move said ribbon in a direction substantially perpendicular to said print line; a ribbon drive wheel insertable into said cartridge and peripherally engageable with said ribbon disc for rotating said ribbon disc to feed said ribbon in feed increments; a tape drive wheel insertable into said cartridge and peripherally engageable with said tape disc for rotating said tape disc to feed said tape; a first cam means mounted for intermittent rotation and driven by said shaft; a first cam follower means interconnecting said first cam means and said ribbon drive wheel for effecting ribbon feed in said feed increments upon the rotation of said cam means; a second cam follower means interconnecting said first cam means and said holder to effect said oscillation of said holder and said cartridge to present a plurality of levels of said ribbon at a writing line of said printer and to permit depression of said cartridge to a position whereby the ribbon is below the writing line; a second cam means mounted for intermittent rotation and driven by said shaft; a third cam follower means operatively connected to said tape drive wheel, and mounted for normal disengagement from said second cam means when in said print mode, and oscillatable into engagement with said second cam means by the elevation of said cartridge to effect feed of said correction tape when in said correction mode, whereby said ribbon is fed upon each cyclic operation of said shaft and tape is fed upon each cyclic operation of said shaft when said second cam is engaged by said third cam follower means by said drive wheels onto a fixed axis takeup spool within said oscillatable cartridge.