Patent ID: 7107904
Filing Date: 2006-09-19
Classification: B41F

Abstract:
1. A liquid feeder, comprising: an impression cylinder rotatably supported and having a notch formed on its outer circumferential surface; a gripper unit disposed in the interior of the notch of the impression cylinder and including a gripper and a gripper pad for holding a sheet; a liquid-feeding cylinder in contact with said impression cylinder and adapted to feed liquid to a sheet held by said gripper unit; and a cover member fixedly attached to said notch in such a manner as to allow said gripper of said gripper unit to project from inside said notch, said cover member having, as a part of its outer surface, a guide surface extending between a first end portion of said notch and a second end portion of said notch with respect to a circumferential direction of said impression cylinder and having a curvature substantially equal to that of said outer circumferential surface of said impression cylinder, wherein said gripper has, an outer surface and as a part of its outer surface, a guide surface having a curvature substantially equal to that of said outer circumferential surface of said impression cylinder such that, when said gripper and said gripper pad grip a said sheet therebetween, said guide surface of said gripper is flush, in a substantially continuous manner, with said outer circumferential surface of said impression cylinder at said circumferentially first end portion of said notch, said guide surface of said cover member is flush, in a continuous manner, with said outer circumferential surface of said impression cylinder at said circumferentially second end portion of said notch, and a clearance is formed between said guide surface of said cover member and said outer circumferential surface of said impression cylinder at said circumferentially first end portion of said notch, and said gripper and said cover member prevent protrusion of said liquid-feeding cylinder into said notch of said impression cylinder.