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US 4,395,152 AGranted
Drive for friction rolls in printers
AssigneeMannesmann Aktiengesellschaft
InventorWolfgang Hendrischk
Life of this patent
Estimating the term…
Abstract
Two friction rolls are journalled on a driven shaft, and a differential being keyed to that shaft causes that one of the rolls to be driven which is not held. The rolls are alternately held by, preferably, latching devices which are operated on limit positions of the print head.
Claims8
Friction drive in printers, including a common shaft and first and second juxtaposed friction rolls, journaled on that shaft, the improvement comprising:
- a differential having a cage and two meshing planet gears journaled on the cage for revolving about the shaft, the planet gears being in engagement with each other;
- first and second gears disposed respectively inside the first and second rolls and respectively meshing the planet gears for driving engagement;
- and
- holding means for selectively holding the first roll or the second roll so that the respective other one is driven via the respective planet gear as engaging respectively the first or the second gear pertaining to the roll not being held by the holding means.
1 more element
Dependencies are inferred from the claim text.