For cleaning automatically on 4 sides, boards for reinforcement even with nails or lightly curved, if desired the finisher can be applied on the underlying part, max workable width of 20 cm, 4 cm max height. Driven by an oil bathed gear.

(There are 4 pulling rollers, so that the last board always exits automatically) two lateral rollers positioned before the scrapers guarantee a preventive and complete removal of the cement crusts, thus facilitating the cleaning of the sides of the board.