Typewriting machines – Sheet or web – Including friction-feed means
Patent
1998-01-22
2000-11-21
Hilten, John S.
Typewriting machines
Sheet or web
Including friction-feed means
400641, 400642, B41J 1100
Patent
active
061493295
ABSTRACT:
A wide format versatile printing mechanism is provided which has ribbon tensioning means to equalize the surface tension forces across the ribbon and remove all wrinkles. In one embodiment a cambered rod is introduced between the print head and the ribbon feed roll to apply an uneven force across the ribbon's width from its uncoated side. The cambered rod is fixed between two lateral lid side plates by two screws having their axis coaxial with the axis of the cambered rod which have at one of the end cut some radial grooves. The cambered rod can be rotated around its axis and positioned under different angles around its axis by means of a set screw through the lid side plate which corresponds with the radial grooves of the cambered rod's end, offering a variation of the tensile forces in the ribbon. In another embodiment, a second rotating cambered rod is located between the print head and ribbon take-up roll to apply an uneven tensile force across the ribbon's width from its uncoated side. This provides an alternate and a versatile additional means for equalizing the tensile forces across the ribbon as it is transported within the device and adapting with different types of ribbon.
REFERENCES:
patent: 4824514 (1989-04-01), Schneider et al.
patent: 5425586 (1995-06-01), Berson
Hilten John S.
Raja Tuli
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