DEVICE FOR PLACING A LOOPED BELT UNDER TENSION

摘要

A tensioning device includes a tension arm mounted on a base and a pulley mounted on the tension arm for engaging a looped belt Mounting bushings can be changed to select between a static mode wherein the tension arm is held stationary relative to the base, and a dynamic mode wherein, in response to a changing force (due to vibrations or changing load) applied between the pulley and the belt, the tension arm moves relative to the base in such a manner as to maintain the force substantially constant Several such devices can be employed for controlling the tension of a looped belt wherein one or more of the devices are in the static mode and/or the dynamic mode Several such systems can be employed in a complex machine, such as a photocopier or medical apparatus, for controlling the tension in a number of different belts.