Tracking arrangement for a moving belt

An improved tracking structure for endless filter belt arrangements comprising:

• an endless flexible filter belt of preselected length, width and porous filtering material, said belt having opposed side edge binders extending approximately two and one half inches along opposite faces of said belt adjacent opposed side edges thereof;
• a support structure for said endless filter belt including spaced drive and driven cylindrical rollers about which said endless filter belt is mounted for lineal movement, said cylindrical rollers each having the longitudinal axis thereof extending transversely to the line of lineal movement of said endless flexible filter belt mounted thereabout with the peripheral surfaces of said rollers being adjacent said binders extending along the side edges of a face of said endless flexible filter belt, said support structure including means to regulate the lineal tension on said endless filter belt;
• at least one of said cylindrical rollers including a set of spaced circumferential O-ring receiving grooves extending around the peripheral surface of the roller, said set of O-ring receiving grooves including pairs of spaced O-ring receiving grooves at edge-spaced opposite ends of said roller with each grooves of a pair being of sufficient depth to receive approximately one third the diameter of O-ring material to be inserted therein to minimize the possibility of O-ring displacement;
• a set of removably and replaceable resilient O-rings of a synthetic material of polymerized butadiene sized to be snugly and removably mounted in said set of grooves with a portion of approximately one third the cross-sectional diameter of the material of each O-ring engaging in the groove in which it is snugly mounted and the remaining frictionally treated portion of the cross-section of each O-ring serving as a protuberance to engage against the side edge binders of an adjacent face of said endless flexible filter belt width so as to be in preselected relation from the opposed side edges of said endless flexible filter belt to maintain said flexible filter belt in centered alignment.