Device for washing blanket cylinder of rotary offset press

In a device for washing a blanket cylinder of a rotary offset press, which device comprises a brush roll disposed on a lateral side of the blanket cylinder for rotation about an axis parallel to the axis of the blanket cylinder, in the same rotational direction as the blanket cylinder, and in pressed state in a region of contact against the blanket cylinder, the rotational direction of the brush roll being such that the peripheral surface thereof in said region of contact moves upward, spraying means disposed above the brush roll for spraying a wash liquid against the blanket cylinder at a part thereof in front of the region of contact as viewed in the rotational direction of the blanket cylinder, and a housing enclosing the brush roll and the spray means, functioning to prevent the washing liquid from scattering undesirably to other parts of the press, and having a trough at the bottom thereof for collecting waste washing liquid and washed-off foreign matter, said housing having a ceiling plate having a bent portion from which the ceiling plate extends obliquely upward with an eave-like shape toward an edge in close proximity of the blanket cylinder, said bent portion being the lowest portion of the ceiling plate and located above the brush roll whereby droplets of the washing liquid slung upward against the ceiling plate flow downward therealong toward said bent portion to drip onto the brush roll and not onto the blanket roll.