Amazon patents camera system to check conveyor wheel wear in real time

1. A system comprising: a carrier that traverses along a cross-belt sorter comprising a first track and a second track, the carrier including at least a first wheel, a second wheel, a third wheel, and a fourth wheel, wherein the first wheel and the second wheel engage with different surfaces of the first track, and wherein the third wheel and the fourth wheel engage with different surfaces of the second track; a first imaging device arranged to image the first wheel; a second imaging device arranged to image the second wheel; a third imaging device arranged to image the third wheel; a fourth imaging device arranged to image the fourth wheel; a sensor; one or more processors; and one or more non-transitory computer-readable media storing instructions that, when executed, cause the one or more processors to perform acts comprising: receiving, from the sensor, sensor data; determining, based on the sensor data, a presence of the carrier; receiving, from the first imaging device and based on the presence of the carrier, first image data visually depicting the first wheel; receiving, from the second imaging device and based on the presence of the carrier, second image data visually depicting the second wheel; receiving, from the third imaging device and based on the presence of the carrier, third image data visually depicting the third wheel; receiving, from the fourth imaging device and based on the presence of the carrier, fourth image data visually depicting the fourth wheel; determining, based on the first image data, a first diameter of the first wheel; determining, based on the second image data, a second diameter of the second wheel; determining, based on the third image data, a third diameter of the third wheel; determining, based on the fourth image data, a fourth diameter of the fourth wheel; determining that at least one of the first diameter, the second diameter, the third diameter, or the fourth diameter is less than a threshold diameter; and generating, based on at least one of the first diameter, the second diameter, the third diameter, or the fourth diameter being less than the threshold diameter, a notification associated with replacing at least one of the first wheel, the second wheel, the third wheel, or the fourth wheel.