Abstract: A conveyor for transporting parts includes a first electrical switch, a second electrical switch and an automatically movable stop. In another aspect of the present invention, an accumulating power roll conveyor system has two or more independently driven zones. Yet another aspect of the present invention provides for a part physically contacting against and actuating a switch as the part is located in a zone corresponding with the switch.

Abstract: A conveyor for transporting parts includes a first electrical switch, a second electrical switch and an automatically movable stop. In another aspect of the present invention, an accumulating power roll conveyor system has two or more independently driven zones. Yet another aspect of the present invention provides for a part physically contacting against and actuating a switch as the part is located in a zone corresponding with the switch.

Abstract: In a power driven roller conveyor having a plurality of rollers mounted on a driven shaft for supporting and transporting a work piece with a limiting drive force. The drive shaft is provided with concentrically disposed spacers, rollers, and bearings which are compressed between an end driving sprocket and an adjustable spring pressure plate on an opposite end and wherein adjustment of the axial compressor force produced by the end mounted spring pressure plate serves to vary the release torque of the individual rollers mounted on the shaft.