Abstract: Anti-jam J-bar structure for handling workpieces, such as lumber, in a workpiece transport system, such as a lumber sorter. Workpieces travel in a single, common flow direction in the system, and are handed-off through a transfer zone between upstream and downstream conveyors, the latter one of which is equipped with the proposed J-bar structure. The J-bars in this structure include spring-biased, pivoted articulation between inner and outer components, and this articulation allows anti-jam yielding and accommodation to occur should a J-bar inadvertently and incorrectly engage a workpiece.