METHOD AND DEVICE FOR DETECTING AND COUNTING AN INSTANTANEOUS PROFILE VARIATION AND THEIR APPLICATIONS

摘要

P The invention consists in reproducing, in particular with the aid of a light emitter 23, in the plane of an optical detector 24 the profile of an object or a set of objects in contact or overlapping. on a conveyor belt 21, for example newspapers 20, in the form of a function Y = f (X), then to explore the profile by two receivers 27, 28 delimited by two slots 30, 31, so that the intersections of the Y function and the lines representing the two receivers are reduced to approximately two points and the distance between the two lines is as small as possible, and finally to determine the derivative Y '(X) permanently and to activate a electronic circuit associated with the detector 24 generating an output signal proportional to the value of the derivative Y '(X). / P P In the case of detection and counting, the output signal is compared with a value predetermined, representative of an instantaneous variation 22 of the profile and a pulse is emitted when the output signal becomes greater than the predetermined value. / P P The invention is also applicable to the detection of wire breaks. / P