Patent ID: 7451974
Filing Date: 2008-11-18
Classification: B41J

Abstract:
1. A recording medium conveyance device comprising: a first conveyance roller which is driven by a driving device and which includes a plurality of protrusions on a surface of the first conveyance roller; first pressing roller which faces the first conveyance roller and which interposes and conveys a recording medium between the first pressing roller and the first conveyance roller; and a pressing force varying device which varies a pressing force of the first pressing roller that is applied to the recording medium; wherein the pressing force varying device varies the pressing force of the first pressing roller applied to the recording medium so as to vary a penetration amount of the plurality of protrusions of the first conveyance roller into the recording medium and to thereby change an amount of conveyance of the recording medium; wherein the recording medium conveyance device further comprises a second conveyance roller which is driven by the driving device and a second pressing roller which faces the second conveyance roller, and wherein the second conveyance roller and the second pressing roller are arranged downstream along a conveyance direction of the recording medium from the first conveyance roller and the first pressing roller with a recording head provided therebetween; wherein the pressing force of the first pressing roller is greater than a pressing force of the second pressing roller, so as to cause a virtual feed diameter of the first conveyance roller to be less than a virtual feed diameter of the second conveyance roller; and wherein the pressing force of the first pressing roller and the pressing force of the second pressing roller are independently variable.