Patent ID: 7015400

Claim:
A belt weighing apparatus for weighing with high accuracy and maintaining said high accuracy in the weighing by means of maintaining a fixed tension in the belt and preventing the belt from oscillating, said apparatus comprising: a supporting frame, an upper guiding unit arranged on the supporting frame, a first and a second end-supporting means arranged on the supporting frame in a proximity to the opposite ends of the upper guiding unit, a motor unit, at least one weighing platform arranged in-between the first and a second end-supporting means, a lower guiding unit having a first characteristic property arranged on the supporting frame, and a conveyor belt having a second characteristic property and forms an endless loop and is extended between said first and a second end supporting means, the motor unit being adapted to move the belt in a revolving manner such that at any instant of time an upper part of the belt rests on the upper guiding unit and the weighing platform defining a conveying part of the belt weighing apparatus, and the lower part of the belt defining the return way of the belt weighing apparatus rests partly on the lower guiding unit that acts as a supporting means while the subsequent part is hanging freely, said support and said freely hanging part being adapted to minimize the oscillation in the belt and to create an optimal tension in the belt so that the accuracy in the weighing is maximized, the first and the second characteristic properties being such that any heat expansion or contraction of the belt will be compensated at least partly through expansion or contraction of the lower guiding unit so that the tension is maintained fixed and therefore the weighing.