Pulse counters having a magnetic pole wheel

Pulse counter device comprising a wheel having magnetic poles arranged at regular intervals about the periphery thereof, an element magnetizable by means of a coil arranged to receive, at its terminals, signals representing pulses to be counted, these signals taking first and second values, said magnetizable element cooperating with the poles of said wheel so as to cause said wheel to rotate through a first predetermined angle, in a given direction, when the signal applied to the terminals of the coil passes from the first to the second value, means for rotating said wheel through a second predetermined angle, in the said given direction, when the signal at the terminals of the coil passes from the second to the first value, and registering means for the pulses to be counted, said registering means being driven by the pole wheel so as to indicate an advance by one unit when said wheel has rotated in the given direction, the means for rotating the wheel through said second predetermined angle comprising elastic return means for causing said wheel to turn through the second predetermined angle, in said given direction, when the signal applied to terminals of said coil passes from the second to the first value, the second predetermined angle being substantially greater than the first, the elastic return means comprising a first cam secured to said pole wheel for rotation threrwith and spring means for cooperating with said cam so as to, on one hand, store potential energy when the pole wheel rotates, in the given direction, through the first predetermined angle under the effect of the passage of said signal from its first to its second value, and to, on the other hand, restore this potential energy when said signal passes from the second to the first value in order to rotate the cam through the second predetermined angle, said cam and the spring means being arranged so that, when said signal passes from its first to its second value, the spring means stores potential energy in the course of a period corresponding to a rotation of the pole wheel through an angle less than said first predetermined angle, said cam comprising first and second parts secure to one another, and the elastic return means further comprising a second cam, the first part of the first cam having a circular contour with teeth regularly spaced and equal in number to that of the poles of the wheel, the second part of the first cam having a contour in the shape of a regular polygon whose number of sides is equal to that of the poles of the wheel, projections being provided in the vicinity of each apex of the contour of said first part, the second cam having first and second parts secured to one another, the first part of the second cam including, at least in part, a circular contour with a tooth intended to cooperate with the teeth of the first part of the first cam, the second part of the second cam having a contour having a rectilinear surface, said spring means comprising a strip having a rectilinear part adapted to rest on the rectilinear surface of the second part of the second cam when said signal has the first value and a curved part whose end is in contact against a projection of the first part of the first cam when the signal passes from the second to the first value.

Pulse counter device comprising a wheel having magnetic poles arranged at regular intervals around the periphery thereof, an element magnetizable by means of a coil arranged to receive, at its terminals, signal representing pulses to be counted, these signals taking first and second values, said magnetizable element cooperating with the poles of said wheel so as to cause said wheel to rotate through a first predetermined angle, in a given direction, when the signal applied to the terminals of the coil passes from the first to the second value, means for rotating said wheel through a second predetermined angle, in the said given direction, when the signal at the terminals of the coil passes from the second to the first value, and registering means for the pulses to be counted, said registering means being driven by the pole wheel so as to indicate an advance by one unit when said wheel has rotated in the given direction, the means for rotating the wheel through said second predetermined angle comprising elastic return means for causing said wheel to turn through the second predetermined angle, in said given direction, when the signal applied to terminals of said coil passes from the second to the first value the second predetermined angle being substantially greater than the first, registering means comprising a plurality of assemblies of rotatable elements adapted to be driven by a drive member secured to the pole wheel for rotation therewith, said rotatable elements and said drive member being arranged so that the driving action of said assemblies takes place solely when the pole wheel rotates, in the given direction, through said first predetermined angle.