generally senses are switches opening and closing deals fast slow thick thin full empty tight loose presence absence flatten a yes no one zero with a curve variable angle gates to control flow mass from completely closed to completely opened multiple points inbetween the number thereof defined by required use so a potentiometer is the encoder tracing the position of the shaft we need feedback from a sensor to make sure that the paper is in position and then that needs to go into the closed control loop which triggers the solenoids one solenoid for each shaft one shaft for each position to be repeated until an absence of material
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