Abstract: A conveyor-separator apparatus having a separator unit slave driven from the conveyor unit by a gear train which employs an idler gear rotatably supported on the separator unit. The idler gear projects from the housing of the separator unit so as to be disposed in meshing engagement with a drive gear associated with the conveyor unit when the two units are joined together. This gear train also employs a drive gear which is in meshing engagement with the idler gear and is coaxially secured relative to the separator belt roller disposed adjacent the lower end of the separation gap. This driven gear is supported on an arm swingable about the axis of the idler gear, which arm can be selectively secured in a desired location. This swinging of the arm causes the axis of the drive gear, and hence the axis of the separator belt roller, to be selectively moved toward or away from the conveyor unit so as to selectively vary the width of the separation gap.