Typewriting machines – Including interposed inking device for record-medium – Including mechanism for shifting ribbon laterally at...
Patent
1981-04-30
1983-01-18
Pieprz, William
Typewriting machines
Including interposed inking device for record-medium
Including mechanism for shifting ribbon laterally at...
400217, 400229, B41J 3514, B41J 3520
Patent
active
043689930
ABSTRACT:
A computer controlled impact printer has a replaceable ribbon guide assembly mounted on a printhead. The assembly is movable vertically between at least two stable positions. Each position places a differently colored portion of the ribbon between the printhead and a sheet of paper. Rotation of a pair of opposed cams changes the vertical position of the assembly. One cam is fixed and the other is rotatable by a pawl operating on a ratchet wheel secured to the cam. The pawl is mounted on the assembly for a longitudinal sliding movement. Movement of the printhead to a preselected position at or near one end of its travel path drives the pawl into an abutment surface which displaces the pawl a predetermined distance. The displacement rotates the movable cam from one stable vertical position to another. The mating cam surfaces preferably have matching sawtooth configurations with recesses formed in the tips of the teeth of one cam. The cams are biased towards one another and the pawl is biased towards the abutment surface.
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Mathews "One Handed Print Element Latch Device" IBM Technical Disclosure Bulletin, vol. 23, No. 2, pp. 435-436, 7/80.
Brass Robert L.
Frega John F.
Centronics Data Computer Corporation
Pieprz William
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