Apparatus and method for processing web material

Abstract

An apparatus and method for processing web material is disclosed. A machine frame includes only one side wall and a pulling group includes a first and a second roll and a carrying framework with a first and a second end plate. The first and second rolls are disposed between the first and second end plates and the first end plate is fixed to the carrying framework and the second end plate is removably attached to the carrying framework. The carrying framework is only attached to the only one side wall of the machine frame by the fixed first end plate. A two-stage throwing-on process of the rolls and a two-stage throwing-off process of the rolls is performed.

1 . An apparatus for processing web material, in particular a folding unit upper part having a machine frame, and having at least one pulling group which is fitted to the machine frame, transports the web material, and is provided with rolls which are driven and thrown onto one another and which are provided with pulling rings and/or supporting rings that are accommodated on a continuous shaft, wherein the machine frame has only one side wall and wherein the rolls of the pulling group are accommodated on a carrying framework which is fitted in a cantilevered manner to an element of the one side wall and which has two end plates which are connected to each other by at least one crossmember and accommodate the rolls, wherein one of the end plates is a stationary end plate which is fixed to the element of the one side wall and the other end plate is removable from the carrying framework, wherein the rolls each include at least two bearings spaced apart from each other in an axial direction in a region of the stationary end plate and each include at least one further bearing in a region of the removable end plate.  
     
     
         2 . The apparatus according to  claim 1 , wherein in a region of the element of the side wall, the side wall includes a window which is open towards an outside and through which a portion of the pulling group is accessible, and wherein the window is covered from an inside by the stationary end plate.  
     
     
         3 . The apparatus according to  claim 1 , wherein at least one of the two bearings in the region of the stationary end plate for each roll is arranged in a region of an outside of the stationary end plate.  
     
     
         4 . The apparatus according to  claim 1 , wherein at least one roll is mounted with opposing ends on respective pivoting levers which are fitted to the end plates such that the ends are pivotable and wherein the pivoting levers each interact with a respective actuating device.  
     
     
         5 . The apparatus according to  claim 4 , wherein a double pivoting lever is provided in the region of the stationary end plate, wherein limbs of the double pivoting lever flank the stationary end plate, wherein each limb includes one of the at least two bearings of the at least one roll, and wherein the limbs are connected by a yoke which extends through a passage defined by the stationary end plate.  
     
     
         6 . The apparatus according to  claim 4 , wherein the actuating devices are arranged in a region of an outside of the end plates, wherein the outsides of the end plates face away from each other.  
     
     
         7 . The apparatus according to  claim 1 , wherein one roll is a stationary roll and wherein at least one bearing of the at least two bearings of the stationary roll is arranged in a bearing housing attached to the stationary end plate.  
     
     
         8 . The apparatus according to  claim 1 , wherein both rolls are driveable by a motor which is fitted to an outside of the element of the side wall, wherein the motor is coupled to one of the rolls, and wherein an intermediate gear connects the two rolls.  
     
     
         9 . The apparatus according to  claim 1 , wherein the shafts of the rolls are subdivided in a region adjacent to an inside of the removable end plate and wherein the shafts are detachably connected at the subdivision.  
     
     
         10 . The apparatus according to  claim 4 , wherein the actuating devices perform a two-stage throwing-on process of the rolls, wherein in a first stage the actuating devices are acted on with a slowly rising low pressure, and wherein in a second stage the actuating devices are acted on with a rapid increase to a higher, adjustable end pressure.  
     
     
         11 . The apparatus according to  claim 10 , wherein the actuating devices perform a two-stage throwing-off process of the rolls, wherein the actuating devices are depressurized in a first stage, and wherein the actuating devices are acted on with pressure in a throwing-off direction in a second stage.  
     
     
         12 . The apparatus according to  claim 10 , wherein an adjustable proportional valve is arranged in a pressure medium supply line assigned to the actuating devices.  
     
     
         13 . The apparatus according to  claim 10 , wherein the rolls are thrown onto each another until they make contact without a stop limiting the throwing-on process.  
     
     
         14 . The apparatus according to  claim 4 , wherein the pulling group is assigned a web presence monitoring device, and wherein the actuating devices are driven in a throwing-off direction if the web material is not detected by the monitoring device.  
     
     
         15 . The apparatus according to  claim 4 , wherein an activation of the actuating device provided in the region of the stationary end plate is carried out with a slight lead during a throwing-on process of the rolls and, during a throwing-off process, is carried out with a slight lag with respect to the actuating device provided in the region of the removable end plate.  
     
     
         16 . The apparatus according to  claim 4 , wherein a 5/2-way valve is arranged in a pressure medium supply line assigned to the actuating devices,  
     
     
         17 . An apparatus for processing web material, comprising: 
 a machine frame with only one side wall; and    a pulling group, including a first and a second roll, and a carrying framework with a first and a second end plate, wherein the first and second rolls are disposed between the first and second end plates, and further wherein the first end plate is fixed to the carrying framework and wherein the second end plate is removably attached to the carrying framework;    and wherein the carrying framework is only attached to the only one side wall of the machine frame by the fixed first end plate.    
     
     
         18 . The apparatus according to  claim 17 , wherein the first and second rolls each include two bearings in a region of the fixed first end plate and wherein the two bearings are spaced apart from each other in an axial direction, and further wherein the first and second rolls each include a third bearing in a region of the removable second end plate.  
     
     
         19 . A method of performing a throwing-on and a throwing-off process for rolls of a pulling group of a folding unit upper part, comprising the steps of: 
 performing a two-stage throwing-on process of the rolls, wherein in a first stage a low throwing-on force is provided, and wherein in a second stage a high throwing-on force is provided; and    performing a two-stage throwing-off process of the rolls, wherein in a first stage an actuating device is depressurized, and wherein in a second stage a pressure is increased in the actuating device in a throwing-off direction.    
     
     
         20 . The method according to  claim 19 , wherein the second stage of the throwing-on process is commenced automatically by detecting a presence of a printing material web between the rolls, and wherein the throwing-off process is commenced automatically by detecting a break in the printing material web.