Pressing device

A pressing device for joining press fittings to tubular workpieces, comprising:

• a. a pressing tool having at least two pressing jaws moveable between an open position and an abutting closed press position;
• b. a motorized drive operably associated with said pressing tool for moving said pressing jaws between said open and closed positions;
• and
• c. a drive controller operably associated with said drive for controlling operation of said drive and therefore movement of said pressing jaws, said drive controller comprising a malfunction detection device having an actual value sensor for detecting the actual value of a physical magnitude correlated with the pressing distance, a limit value profile for the actual value retained in said malfunction device, a comparison device periodically determining during the pressing operation whether a particular actual value lies on the permissible side or the impermissible side of the pertinent limit value profile, and a signal device and/or a shut down device operably associated with said drive which is/are activated at any time during the pressing operation during movement of the pressing jaws from the open to the closed position, wherein at least one other limit value is retained in said malfunction device lying on an impermissible side of said first mentioned limit value profile so that if the actual value lies on the impermissible side of said first mentioned limit value profile but on the permissible side of said other limit value, said signal device is activated and if the actual value lies also on the impermissible side of said other limit value said shut down device is activated and thereby movement of said pressing jaws stopped.