Reduction of Contact Resistance in Printing
Original Publication Date: 1986-Jul-01
Included in the Prior Art Database: 2005-Mar-09
In resistive ribbon printing, a printhead consisting of an array of 40 electrodes slides upon an electrically conducting ribbon and causes local heating of the ribbon by locally injecting current (arrows 3) into the ribbon. The heating causes regions of an ink layer 4 coated upon the ribbon to melt and to be transferred to a contacting sheet of paper or other material. This method of thermal printing provides fast, high quality printing on a variety of contacting sheets. In general, a contact resistance exists between the sliding electrodes and the resistive ribbon, due to imperfect mechanical contact between these members. Some proportion of the power supplied to the ribbon is dissipated in this contact heating, resulting in heating of the printhead with undesired wear and other consequences and inefficient use of energy.