Endless ribbon cassette

Claim 1

A ribbon cassette for an endless-looped ink ribbon of up to a given width, the cassette having a ribbon chamber which has an upper portion, a floor and a wall with a depth slightly larger than the given width of the ribbon for storing the ribbon in a stuffed state therein; an inlet opening and an outlet opening formed in said wall; a cover member having a lower surface covering said upper portion of said chamber; and ribbon feed means for feeding the ribbon into said chamber through said inlet opening and drawing out the ribbon from said chamber through said outlet opening, wherein the improvement comprises a depending plate formed on said lower surface of said cover member in a position near said outlet opening, said depending plate being in form of a substantially isosceles triangle which has a substantially roundish tip at its vertex, said depending plate having a base portion which is elongated in a direction perpendicular to that direction in which the ribbon moves from said inlet opening towards said outlet opening along a ribbon path of given width, with length of said base portion smaller than the given width of the ribbon path, and said depending plate depending from said cover member towards the floor such that the distance between said roundish tip at said vertex of said depending plate and the surface of the floor is smaller than the given width of the ribbon, while allowing the ribbon to pass over said roundish tip.