| 摘要 |
The present invention is directed to members (10) by which a flat conveyor belt (11) can negotiate a turn while supporting a ribbon (12) of material and without deleteriously deforming that ribbon. A series of flights (50) are spaced longitudinally along the conveyor (11). Each flight is inclined at an angle ( theta ) with respect to the plane of the conveyor (11). The apex (52) of the angle theta is located in proximity to the outer edge of the conveyor such that the support member 51 is inclined upwardly and inwardly. Because of the orientation of the inclination, the outer edge of the ribbon will be supported by the support member (51) and/or the belt member (20) to be transported without any change in disposition and without being subjected to any substantial tensile stresses. Progressing laterally inwardly from the outer edge of the ribbon, the ribbon is allowed to drape, or sag, between the successive flights in the form of a catenary, thus allowing the inner edge of the ribbon to assume a controlled disposition that will not be deleterious. Selection of the inclination angle theta is a function of the spacing between successive support members, the radius of the turn and the width of the conveyor. These factors can be stated as a mathematical equation by which to determine the optimum value for the inclination angle theta .
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