Patent ID: 8142087
Filing Date: 2012-03-27
Classification: B41J

Abstract:
1. An image printing device comprising: a load unit that loads a plurality of overlapped printing media; a printing unit that performs a printing process for the printing media transported from the load unit; a moving unit that is movable in a predetermined main scanning direction; a printing medium detecting unit that is mounted to the moving unit and detects a signal relating to a presence of a printing medium; a position detecting unit that detects a position of the moving unit; and a control unit that determines a change in the presence of the printing medium based on the detected signal from the printing medium detecting unit at a time when the moving unit is moved at a predetermined timing in the printing process, stores a first set of measured positions based on the position of the moving unit at a time when the presence of the printing medium changes, calculates a first width using the first set of measured positions, calculates a second width using a second set of measured positions, determines that duplicate transport with a horizontal discrepancy has occurred when the first width calculated using the first set of measured positions is approximately the same as a theoretical width and the second width exceeds the theoretical width by a significant value, and performs a process corresponding to the duplicate transport with a horizontal discrepancy, wherein the predetermined timing is when the moving unit is determined to traverse left and right ends of the printing medium in accordance with a maintenance request in the printing process.