Endless ink-ribbon cartridge

B - Operations – Transporting – 41 – J

Patent

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196/106

B41J 33/10 (2006.01) B41J 32/02 (2006.01)

Patent

CA 1098068

ABSTRACT OF THE DISCLOSURE The present invention relates to an apparatus for imparting a longitudinal angular rotation of 180° with minimum friction to a moving ink-ribbon in an endless ink-ribbon cartridge having a tern of cartesian orthogonal reference axes, x, y, w, and re- lated reference planes xy, xw and yw, the ribbon having a first and second edge and a height h, the rotation being imparted in an inversion zone limited by two extremity guiding slots, through which the ribbon passes, said slots being located in plane xw, sub- stantially at an equal distance from axis w, on the same side re- lative to axis x, so that an edge of the ribbon coincides with axis x, at least within said slots, said apparatus comprising: two deflecting elements, each element having a substantially rectilinear leading edge, placed on the ribbon path, each element acting on a different face of the ribbon, with its own leading edge, to impart a bending to the ribbon, said leading edges crossing each other substantially in plane xw at a distance from plane xy substantially equal to h/2 and defining an inversion plane along which the ribbon is bent, between said leading edges, said inversion plane being perpendicular to plane xw and having a slope relative to plane xy such that the paths of the ribbon edges in the inversion zone have the same lengths.

301565

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