Improvements in supervisory systems and selecting of the successive weights of the different products that enter to form part of a mixture. (Machine-translation by Google Translate, not legally binding)

摘要

Improvements introduced in the object of the main patent no. 366,344, requested on may 9, 1969 for "improvements in supervisory systems and selectors of the successive weighings of the different products that come to form part of a mixture", especially to select and dose successive weighing of the raw materials used in the manufacture of compound feed, in installations equipped with a scale associated with a common hopper in which the doses of the different raw materials are accumulated, one after the other, by means of supplying devices. The different materials, operated simultaneously with each weighing operation, whose systems comprise a preselector disk arranged to rotate on the axis that drags the needle of the machine when it is driven by a pulling device, whose electrical contacts with the fixed part of the system are made by mobile contacts of two breakers arranged in displacement points a multiplicity of half of the distance between two teeth in said axis and in series with the supply circuit of counters connectable each in each operation of selection of the corresponding raw material, so that, at each return of the motor, they provide a number of pulses twice the number of teeth of a multiple cam arranged on the same axis and causing the rupture of said contacts; a first photoelectric cell arranged, with its associated light source, on the preselector disk and which will cause the supply of the selected substance to stop when the predetermined weight is reached by the preselector disk; a series of push buttons for selecting substances, each of which connects the motor that drives the feed screw of the corresponding substance, the drive motor of the preselector disk, with the multi-contact cam, and the corresponding counter ; a push button for resetting the preselector disk, by completing the complete revolution; a second photoelectric cell arranged in the housing of the scale, coinciding with the zero, and which stops the motor that drives the preselector disk when it reaches zero; said improvements being characterized because a contact is provided on the supply line of the selection buttons which is activated by the relay that connects the circuit that drives the motor for the zeroing movement of the preselector disk and which disconnects said line of power supply to the substance selection pushbuttons when the reset button is pressed, which prevents the corresponding motors for the supply of substances for mixing from being activated inadvertently by any of these. (Machine-translation by Google Translate, not legally binding)