Abstract: The invention is particularly useful for accumulation conveyors. An assembly located beneath its corresponding zone of item transporting rollers activates the item transporting rollers by lifting the accumulator's narrow belt to engage the underneath side of the item transporting rollers. Electric actuation rather than the traditional pneumatic actuation activates the assembly's vertical movement toward its corresponding zone of item transporting rollers. Whether activated or not, the assembly's rack journals a plurality of pressure rollers that remain contiguous with the narrow belt. Centering of the sideways movement of the narrow belt as the belt travels about the rack is associated with either a pivoting tracking roller journaled in the rack or a flanged pressure roller or rollers channel in the rack. A constant force takeup can be supplied to the belt.

Abstract: The invention is particularly useful for accumulation conveyors. An assembly located beneath its corresponding zone of item transporting rollers activates the item transporting rollers by lifting the accumulator's narrow belt to engage the underneath side of the item transporting rollers. Electric actuation rather than the traditional pneumatic actuation activates the assembly's vertical movement toward its corresponding zone of item transporting rollers. Whether activated or not, the assembly's rack journals a plurality of pressure rollers that remain contiguous with the narrow belt. Centering of the sideways movement of the narrow belt as the belt travels about the rack is associated with either a pivoting tracking roller journaled in the rack or a flanged pressure roller or rollers channel in the rack. A constant force takeup can be supplied to the belt.

Abstract: A drive belt take-up system for a live roller conveyor. Live roller conveyors are made up of one or more curved and/or rectilinear segments. Each segment comprises a pair of spaced side frames which support the live rollers. The live rollers carry and transport the articles being conveyed. The live rollers are driven by frictional contact with the upper flight of a continuous drive belt. At one end of the conveyor segment one of the side frames (the one with a smaller radius of curvature in the case of a curved segment) supports a powered sheave which drives the belt. The same side frame supports a plurality of idler wheels therealong and a first idler sheave at its other end, all of which maintain the upper flight of the drive belt in frictional contact with the live rollers. From the first idler sheave the drive belt passes about an adjustable take-up sheave. Thereafter the belt passes about a second idler sheave located near the first idler sheave.