Fail-safe mechanism for stopping movement of the photoconductive belt in an electrostatic reproduction machine when tracking of the belt becomes irregular and uncontrollable

摘要

An electrostatic reproduction machine has a belt assembly having an endless photoconductive belt mounted thereon for movement around a closed path. The machine also has a fail-safe mechanism for stopping the movement of the belt in the event the tracking thereof becomes irregular and uncontrollable. This mechanism converts lateral movement of the belt into rotary movement so as to open (or close) either of two mercury switches to stop the belt movement, the switches being mounted so that their positions with respect to the remainder of the mechanism and the belt assembly can be adjusted in accordance with position of a sensing rod with respect to the remainder of the mechanism after the belt assembly is initially moved into its operative position.