US Patent 7278793 Image generating apparatus

An image generating apparatus capable of rotating a pressing member pressing a print head against a platen roller at a large rotation angle with a cam is obtained. This thermal transfer printer (image generating apparatus) comprises a drive cam for driving the pressing member. This drive cam includes a cardioid cam engaging with a cam pin provided on the pressing member and a protrusion, constituted of a first protrusion and a second protrusion, for restraining the cam pin from moving by force other than that of the drive cam.