1. Apparatus for controlling the feed of loose material in a transport channel, comprising a channel having spaced apart sidewalls and a carrying band constituting the bottom of said channel, said band being mounted within said side-walls to reverse direction within the extent of said side walls, bars traversing the width of said band and affixed thereto, arcuate slots in said side walls, said slots being in registry with each other and terminating proximate said point of reversal of said moving band, a rotary shaft having an end protruding through each of said slots, fingers extending outward from said shaft along that portion of said shaft within said channel, oscillatable support means having one end pivoted to each of said side walls at points which are the centers of said arcs of said arcuate slots, said shaft being rotatably mounted on the other end of said support means, means for oscillating said support means for moving said shaft within said arcuate slots, the extent of oscillation of said support meAns being such that said fingers approach but do not make contact with said band or bars, and means for driving said band.