All the belt rollers are driven by the motor.
Thanks to the green actuator the yellow frame can slide along the runways made on the conveyor base.
Such movement allows the conveyor to retract or to extend.
There are two red screws for tensioning the belt.
In this design the belt is not slack during retracting or extending process because all the belt branches are arranged parallel to each other. If not, an automatic belt tensioner is required.
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