Patent ID: 7278793
Filing Date: 2007-10-09
Classification: B41J

Abstract:
1. An image generating apparatus comprising: a print head for printing; a platen roller opposed to said print head; a rotatably supported pressing member, having a cam pin, for pressing said print head against said platen roller by pressing the upper portion of said print head; and a drive cam for driving said pressing member, wherein said drive cam includes a cardioid cam engaging with said cam pin provided on said pressing member and a movement control member for restraining said cam pin from moving by force other than that of said drive cam when said cam pin reaches a prescribed position of said cardioid cam, and the cardioid cam includes a first cam configured to move the cam pin provided on the pressing member from the outer periphery of the drive cam toward the inner periphery thereof when driving the pressing member and move the cam pin oppositely when releasing the pressing member, a second cam, separately provided from the first cam, configured to move the cam pin provided on the pressing member from the inner periphery of the drive cam toward the outer periphery thereof when driving the pressing member and move the cam pin oppositely when releasing the pressing member, and a coupling portion coupling an end of the first cam and an end of the second cam with each other.