The present invention provides a method and apparatus for using light emitting diodes for curing and various solid state lighting applications. Opening the pivotable support associated with the conveyor’s leg allows the damaged conveyor belt to be removed from the conveyor without dismantling numerous sections of the belt holder. Using the depth image data, a series of movements of the operator is tracked in 3D space of the workstation region. An output of the op-amp communicates with a control terminal of the transistor. An activator for the blocking device is supported by the plate, defining two configurations of the blocking device, respectively inoperative, with a disengagement of the ratchets from the corresponding edges and operative, with a blocking of the two edges against the plate. The printing resist comprises at least one polymer main chain bound to a tackiness-inducing vinyl group.