Patent ID: 8789491
Filing Date: 2014-07-29
Classification: B05C,B41J,G03G

Abstract:
1. An ink jet printing apparatus, comprising: an applying roller that applies a liquid to a medium while being rotated; a print head that ejects ink to the medium; a liquid holding member that contacts the applying roller to form a liquid holding space between the liquid holding member and a peripheral surface of the applying roller; a bias unit for biasing the liquid holding member towards the applying roller to cause the liquid holding member to contact the applying roller; and a support unit comprising a pivotal shaft extending along a direction parallel to a direction of a rotational shaft of the applying roller, the support unit being configured to support the liquid holding member such that the liquid holding member is passively rotatable around the pivotal shaft to follow the peripheral surface when the liquid holding member is biased towards the peripheral surface by the bias unit, wherein, when viewed in the direction of the rotational shaft of the applying roller, an axis of the pivotal shaft of the support unit is positioned inside a quadrangle formed by connecting: (i) a rotating center of the applying roller, (ii) an upstream tangent point between the applying roller and an upstream side of the liquid holding member in a rotation direction of the applying roller, (iii) a downstream tangent point between the applying roller and a downstream side of the liquid holding member in the rotation direction of the applying roller, and (iv) an intersection point between a tangent line of the applying roller passing through the upstream tangent point and a tangent line of the applying roller passing through the downstream tangent point.