Abstract: Reel winding device and process for supporting a reel winding device. The device includes a winding bed formed from two support rolls, that form side walls of a pressure chamber, and a bottom wall having at least one movable sealing member disposed between the bottom wall and at least one support wall. The movable member is adapted to move in a direction away from the winding bed and may be loaded with a positioning force in the direction of a sealing position. The movable member cooperates with a position sensor, which emits an error signal in the event of displacement of the sealing body away from the support roll. The process includes rotating the winding reel, rotating the support rolls and positioning a movable sealing body in a vicinity of a circumferential surface of at least one support roll. The process further includes moving the sealing body in a direction away from the winding bed and loading the sealing body with a positioning force in the direction of a sealing position.