Wrinkle Eliminator for Continuous-Roll Paper Feed
Original Publication Date: 1983-Sep-01
Included in the Prior Art Database: 2005-Feb-07
In a thermal printer in which a wide thermal head acts on paper emerging from a supply roll to form images a line at a time, a problem of paper wrinkling is corrected by applying compensating drag forces to the paper using the mechanism described below. Analysis of the wrinkling effect reveals that it is due to exertion of non-uniform forces on the paper at its passage between the head and feed roll. This causes "blousing" and eventual wrinkling of the paper. Fig. 1 indicates the paper path configuration and the blousing effect. Paper 1 is drawn from supply roll 2 through the passage 3 between (line width) thermal print head 4 and feed roll 5. Due to non-uniform forces encountered at this passage, one side of the paper may travel faster than the other, resulting in a blousing effect 6 at the slower moving side.