Paper making machine with a traveling deckle board

In a Fourdrinier paper-making machine, the improvement comprising a pair of parallel deckle belt means defining the lateral limits of the liquid paper-making stock as it exits from the head box onto a Fourdrinier fabric and for a short distance downstream from said head box, each said deckle belt means including an endless taut loop of movable deckle belt about two spaced pulleys to provide a movable wall positioned normal to the plane of said Fourdrinier fabric supporting said paper-making stock as it leaves said head box motor means for driving one of said two spaced pulleys of each said deckle belt means, said movable wall being flexible and substantially impermeable to said liquid paper-making stock and being driven by power means to travel at substantially the same linear speed as that of said Fourdrinier fabric, said deckle belt means being adjustable so as to be rapidly movable from an operable position where said movable wall touches said Fourdrinier fabric and prevents any material leakage laterally from said liquid paper-making stock resting on said fabric to an inoperable position where said movable wall does not touch said fabric, said operable position of said deckle belt means being tilted at an angle to the vertical of at least 1 degree so that said movable wall barely touches said fabric and yet does prevent leakage laterally from said fabric without materially abrading said fabric while said deckle belt has its return portion slightly elevated above said fabric.