Full definition
The pulley located at the feed (loading) end of a conveyor system, opposite to the drive drum. Typically non-motorized (idler), it redirects the belt on its return run. Often incorporates a screw take-up mechanism for belt tensioning, with travel equal to 1.5-3% of belt length. Diameter: typically 50-75% of the drive drum diameter, subject to minimum bending radius of the belt. Construction: welded steel cylinder with stub shafts and bearing housings. Self-cleaning types feature wing or spiral designs to shed material buildup that causes mistracking. In long conveyors, the tail pulley may have a gravity take-up instead of screw adjustment. Lagging (rubber coating) is optional but recommended in wet environments to maintain traction on the return belt. Per CEMA standards. Alignment of the tail pulley is critical for belt tracking — it is the primary adjustment point for correcting belt wander.