Technology for detecting a change in a configuration position of one or more elements in an illumination system is described. An angle between an imaginary extension plane of an outer surface of a third partition wall and an imaginary extension plane of a lower surface of the pedal arm is one of an obtuse angle and a right angle. A vacuum module is configured to raise, transfer and lower a spacer from a location remote from the pocket on the seal plate to the pocket on the seal plate. A media drive is operable to perform at least one of writing data on the medium and reading data from the medium. The vane-type plasticating and conveying unit and various screw-type extruding unit or various plunger-injection unit can be combined to form a vane-type plasticating and injection device of an extruder or injection machine.