Patent ID: 6272968
Filing Date: 2001-08-14
Classification: F15B

Abstract:
A control system of a pneumatic oscillation cylinder (1) to produce the oscillating motion of a scraper (3) used in paper machines and to adjust the length and speed of the said motion, whereby there is in the oscillation cylinder motion rod (18) motion stoppers (4) adjustable with regard to their position, which in both of the wanted reversing points of the rod (18) motion open an own pressure discharge valve (5) for the stopper in the pilot operation line (9), whereby opening both pressure discharge valves (5) in turns causes a reversing function in the pneumatic reversing valve (10) known as such, which conducts working pressure to the oscillation cylinder (1) characterized in that the piston rod (18) of cylinder (1) reaches through the cylinder symmetrically in order to produce the symmetrical to-and-from motion, and that the valves and motion stoppers are inside an encased construction (20,21), whereby the box (20,21) is kept under overpressure at least by means of air streams escaping through valves (5).