Method and device for threading a web

Abstract

A leading end of a material web is threaded into a machine, such as a web-fed rotary printing press. The leading end of the web is coupled to a threading device which can be conveyed along a threading path. A first motor, in a receiving area of the web, and a second motor, in a delivery area of the web, are used to drive the threading device. During web threading, one of the motors is controlled with respect to web speed while the other motor is controlled with respect to a predetermined torque.

1 - 26 . (canceled)  
     
     
         27 . A method for threading a material web in a web processing machine including: 
 providing a web receiving area in said web processing machine;    providing a web delivery area in said web processing machine;    providing a web threading path extending between said web receiving area and said web delivery area;    providing a web threading means adapted for receiving said material web and being conveyable between said web receiving area and said web delivery area;    providing a first web threading means drive motor at said web receiving area and a second web threading means drive motor at said web delivery area;    regulating one of said first and second motors at a predetermined web threading speed; and    regulating the other of said first and second motors at a predetermined motor torque.    
     
     
         28 . The method of  claim 27  further including regulating said one of said first and second motors with regard to its motor speed.  
     
     
         29 . The method of  claim 27  further including providing a frequency converter and using said frequency converter for regulating said one of said first and second motors.  
     
     
         30 . The method of  claim 27  further including providing first and second reel bodies about which said threading means is alternatingly wound and unwound and using each of said first and second motors for driving respective ones of said first and second reel bodies.  
     
     
         31 . The method of  claim 30  further including regulating at least one of said first and second motors depending on a current diameter of at least one of said first and second reel bodies.  
     
     
         32 . The method of  claim 31  further including providing a control device and using said control device for determining a target value of a frequency load to said at least one motor depending on said reel body current diameter.  
     
     
         33 . The method of  claim 31  further including determining said current reel body diameter depending on a number of layers of said threading means wound on said reel body and a thickness of said threading means and further depending on an initial diameter of said reel body.  
     
     
         34 . The method of  claim 33  further including providing a rotation sensor on one of said reel body and its drive, calculating a number of rotations of said reel body and using said number of rotations for determining said number of layers of said threading means wound on said reel body.  
     
     
         35 . The method of  claim 34  further including determining said number of rotations of said reel body in said receiving area.  
     
     
         36 . The method of  claim 34  further including determining said number of rotations of said reel body in said delivery area.  
     
     
         37 . The method of  claim 27  further including regulating said first web threading means drive motor in said receiving area at said predetermined motor torque and regulating said second web threading means drive motor at said delivery area at said predetermined web threading speed during a web threading operation.  
     
     
         38 . The method of  claim 27  further including regulating said first web threading means drive motor in said delivery area at said predetermined motor torque and regulating said second web threading means drive motor at said receiving area at said predetermined web threading speed during a web threading operation.  
     
     
         39 . The method of  claim 27  further including providing a rotary drive for at least one mechanically independent assembly of said web processing machine and controlling said one of said first and second motors and said assembly motor correlated with each other with respect to speed.  
     
     
         40 . The, method of  claim 27  further including a material web reel changer in said web processing machine having a reel changer drive and controlling said one of said first and second motors and said reel changer drive correlated with each other with respect to their speed by using a machine control.  
     
     
         41 . The method of  claim 27  further including providing said web processing machine as a printing unit having a printing unit drive and further including controlling said one of said first and second motors and said printing unit drive correlated with each other with respect to speed by using a machine control.  
     
     
         42 . The method of  claim 27  further including providing a control device including a servo control and using said servo control for driving the other of said first and second motors at said predetermined motor torque.  
     
     
         43 . A device for threading a web of material into a web processing machine comprising: 
 a web threading device adapted to receive a web to be threaded;    a web threading path along which said web threading device is adapted to travel, said web threading path extending between a web receiving area and a web delivery area;    a first motor in said web receiving area and a second motor in said delivery area;    means for regulating one of said first and second motors with respect to speed; and    means for regulating the other of said first and second motors with respect to torque.    
     
     
         44 . The device of  claim 43  further including a control device usable to produce a frequency signal based on a predetermined threading speed, and a signal connection between said one of said first and second motors and said control device.  
     
     
         45 . The device of  claim 44  further including a machine control adapted to provide said control device with a target value for said predetermined threading speed.  
     
     
         46 . The device of  claim 45  further including a mechanically independently driven assembly in said web processing machine, said machine control being in signal connection with said assembly to transmit speed relevant signals.  
     
     
         47 . The device of  claim 43  further including at least one mechanically independent assembly in said web processing machine and a machine control usable to provide speed relevant signals to said one of said first and second motors and to said at least one mechanically independent assembly.  
     
     
         48 . The device of  claim 47  further including a virtual rotational axis for said machine control, and being usable to transmit said speed relevant signals.  
     
     
         49 . The device of  claim 43  further including a first reel body in said receiving area and a second reel body in said delivery area, each of said first and second motors being adapted to drive a respective one of said first and second reel bodies.  
     
     
         50 . The device of  claim 49  further including a rotation sensor on one of said first and second reel bodies.  
     
     
         51 . The device of  claim 44  wherein said control device includes a calculating means usable to provide a frequency signal for said motor based on a predetermined threading speed and a number of rotations.  
     
     
         52 . The device of  claim 43  further including a control device usable to regulate said other of said first and second motors with respect to torque.