Reel changer of a web-fed printing press

A reel changer of a web-fed printing press, comprising:

• a load-bearing axle including a carrying arm having at least two carrying-arm segments, said load bearing axle being movable for moving said carrying arm between a loading mode and a production mode, said carrying arm being arranged and dimensioned for receiving a printing-material reel in said loading mode, whereby the printing material reel is mountable or clampable between said carrying-arm segments in the loading mode, and said carrying arm being further arranged and dimensioned such that said carrying-arm segments are displaceable relative to said load-bearing axle in said production mode, whereby the printing-material reel is displaceable relative to said load-bearing axle by said carrying-arm segments;
• a control system monitoring a relative spacing between said carrying-arm segments in said production mode and blocking movement of said carrying-arm segments in the event of an impermissible spacing deviation;
• and
• a safety system operating independently of said control system, said safety system comprising distance measuring devices connected to an evaluation device for monitoring the relative spacing between said carrying-arm segments in the production mode and blocking movement of said carrying-arm segments in the event of an impermissible spacing deviation, each of said distance measuring devices corresponding to a respective one of said carrying-arm segments.