Roll changer with motor brake

Abstract

A drive for a roll changer with at least one motor ( 1 a , 1 b ) for driving the roll changer has a driving electronic unit ( 9 ). The driving electronic unit drives the motor ( 1 a , 1 b ), of which there is at least one, such that the motor ( 1 a , 1 b ), of which there is at least one, acts as a drive and/or as a brake. A process is provided for driving or actuating a roll changer, where at least one motor ( 1 a , 1 b ) of the roll changer is actuated or driven such that it acts as a drive or as a brake.

What is claimed is:  
     
         1 . A rotary printing press roll changer drive for changing rolls during a rotary print run, the rotary printing press roll changer drive comprising: 
 a motor for driving the roll changer; and    a driving electronic unit which drives the motor for controlling the motor to act selectively as a drive and a brake.    
     
     
         2 . A roll changer drive in accordance with  claim 1 , wherein said motor is provided as a central drive.  
     
     
         3 . A roll changer drive in accordance with  claim 1 , further comprising another motor said motor and said another motor being arranged on different sides of the roll changer.  
     
     
         4 . A roll changer drive in accordance with  claim 1 , wherein said motor is a three-phase asynchronous motor.  
     
     
         5 . A roll changer drive in accordance with  claim 3 , wherein said motors are driven via said driving electronic unit acting as a common drive control.  
     
     
         6 . A roll changer drive in accordance with  claim 1 , wherein said driving electronic unit includes a feedback control to take into account or compensate for the characteristics of said motor.  
     
     
         7 . A roll changer drive in accordance with  claim 6 , wherein said driving electronic unit a control taking into account set points and/or actual values of the paper speed, the web tension or a dancing roller position to generate driving signals for said motor.  
     
     
         8 . A roll changer drive in accordance with  claim 1 , wherein said driving electronic unit has a drive controller and a power stage comprising a power supply unit and a frequency converter.  
     
     
         9 . A roll changer drive in accordance with  claim 8 , wherein said power stage has a power supply unit for feedback, for feeding electric energy back into an electric network or a battery during a braking mode of said motor connected to said frequency converter.  
     
     
         10 . A roll changer drive in accordance with  claim 3 , wherein said motors are connected to the said driving electronic unit in parallel to an output of said driving electronic unit.  
     
     
         11 . A roll changer drive in accordance with  claim 3 , wherein said motors connected to said driving electronic unit are connected in series.  
     
     
         12 . A rotary printing press roll changer for changing rolls during a rotary print run, the rotary printing press roll changer comprising: 
 a roll core support for supporting a paper roll;    a motor for driving the paper roll;    a dancing roller to regulate the tension of the paper roll; and    a driving electronic unit for controlling the motor to act selectively as a drive, and a brake, said driving electronic unit taking into account set points and/or actual values of the paper speed, the web tension or a dancing roller position to generate driving signals for said motor.    
     
     
         13 . A roll changer in accordance with  claim 12 , further comprising another motor said motor and said another motor being arranged on different sides of the roll changer.  
     
     
         14 . A roll changer in accordance with  claim 12 , wherein said driving electronic unit has a drive controller and a power stage comprising a power supply unit and a frequency converter and said power stage has a power supply unit for feedback, for feeding electric energy back into an electric network or a battery during a braking mode of said motor connected to said frequency converter.  
     
     
         15 . A process for driving or actuating a rotary printing press roll changer, the process comprising the steps of: 
 providing a roll core support for a paper roll, providing a rotary printing press roll changer motor for driving the paper roll and providing a driving electronic unit for controlling the motor;    actuating or driving the rotary printing press roll changer motor for driving the roll and for braking the roll; and    using the rotary printing press roll changer for changing rolls during a rotary print run.    
     
     
         16 . A process in accordance with  claim 15 , wherein said motor is driven with voltage signals in a braking mode, so that the motor generates an opposing force to a preset rotary movement based on the voltage signals.  
     
     
         17 . A process in accordance with  claim 15 , wherein said motor is operated as a generator during the step fo braking the roll.  
     
     
         18 . A process in accordance with  claim 15 , in which the motor characteristic is taken into account during the driving of the motor.  
     
     
         19 . A process in accordance with  claim 15 , wherein a dancing roller is provided for regulating the tension of the paper roll and in which a speed correction value, which is added to the actual value of the paper speed of a printing press, is formed from the difference between a set point and an actual value of a dancing roller position, and the actual value of the paper speed of the paper roller is subtracted from this sum, and a driving variable is formed from this difference for the electric motor.  
     
     
         20 . A process for driving or actuating a rotary printing press roll changer, the process comprising the steps of: 
 providing a roll core support for a paper roll, providing a rotary printing press roll changer motor for driving the paper roll and providing a driving electronic unit for controlling the motor;    actuating or driving the rotary printing press roll changer motor for driving the roll and for braking the roll;    providing a dancing roller; and    forming a speed correction value, which is added to the actual value of the paper speed of a printing press, from the difference between a set point and an actual value of a dancing roller position, and the actual value of the paper speed of the paper roller is subtracted from this sum, and a driving variable is formed from this difference for the electric motor.