The machine has been designed and built to check the deviations from the nominal weight of a series of similar objects, to compare these deviations with the limit values ​​of acceptability that have been set and to calculate the weighting trend of the production of the line in which the machine is inserted automatically. The scale is inserted in a transport line of the objects to be checked of any nature and shape. The transcurrent object takes a certain amount of time to travel across the entire scale; this time, although small, is sufficient for the scale to settle in proportion to the weight of the object. When the object is about to leave the weighing pan, it intercepts a light beam that crosses the conveyor. The phototransistor receiver, so obscured, provides the electronic circuit with the command to perform the weight reading at that precise moment. This weight value is immediately compared with the two values, lower and upper, set as limits of the allowed tolerance. This comparison gives rise to the decision of the machine to accept or not the weighing, that is, to allow the object to continue undisturbed, or to deflect it or expel it to the right or left of its path, depending on whether its weight is in excess or in defect to the pre-established tolerance.

This versatile system is easy to use and maintain. The machine for automatic continuous weight control is essentially made up of: A base that has the task of supporting the scale and the device for transporting objects. A comparative balance of high sensitivity and readiness, equipped with an electromagnetic detector that transforms into an electrical signal the position that the plate of the scale takes, burdened by the weight that is passed on it. A conveyor belt, and a projector - photocell group that signals the instant in which the object is about to leave the scale plate.