An apparatus for safely controlling a paper cut-off device in a paper towel dispenser in which a knife of the cut off device can effectively be locked in a stop position within a recess of a drum. Alternatively, the apparatus can lock the knife in a position of initial rotation within the recess of the...http://www.google.de/patents/US5937718?utm_source=gb-gplus-sharePatent US5937718 - Folded/unfolded paper towel dispensing apparatus
