Apparatus and method for the transport of web-like material

Abstract

An apparatus and method for the transport of web-like material, in particular printed webs or packets of printed webs fed from a fold former positioned downstream of a printing machine with a roll that can be driven and against which pressure-application rolls can be adjustably pressed is disclosed. A high degree of working and operational security can be achieved by arranging that the pressure-application rolls are carried by a relevant assigned position-setting assembly which exhibits at least one actuating element capable of receiving an impulse from a pressure-applying agent, where the impulse from the pressure-applying agent can be controlled according to a pre-settable timing sequence by a control device.

1 . An apparatus for the transport of web-like material, in particular printed webs or packets of printed webs fed from a fold former positioned downstream of a printing machine with a draw roll and against which a pressure-application roll can be adjustably pressed, wherein the pressure-application roll is carried by an assigned position-setting assembly which includes at least one actuating element which receives an impulse from a pressure-applying agent, wherein the impulse from the pressure-applying agent is controllable according to a pre-settable timing sequence by a control device.  
     
     
         2 . The apparatus according to  claim 1 , wherein a control valve controlled by the control device is arranged in a device which provides the pressure-applying agent and is assigned to the actuating element.  
     
     
         3 . The apparatus according to  claim 2 , wherein the control valve is a proportioning valve.  
     
     
         4 . The apparatus according to  claim 1 , wherein the control device contains a computer with a memory in which the timing sequence is stored.  
     
     
         5 . The apparatus according to  claim 1 , wherein the impulse from the pressure-applying agent to the actuating element is effected in two stages, wherein in a first stage the pressure-application roll is pressed against the draw roll without a force and wherein in a second stage the force is increased rapidly to a prescribed norm value.  
     
     
         6 . The apparatus according to  claim 5 , wherein the norm value is stored in the control device.  
     
     
         7 . The apparatus according to  claim 1 , wherein a final positioning force of the pressure-application roll is variable in dependence upon a current production of the apparatus.  
     
     
         8 . The apparatus according to  claim 5 , wherein switching to the second stage takes place in dependence upon an operating circumstance of the printing machine.  
     
     
         9 . The apparatus according to  claim 1 , wherein the control device is connected to a control system of the printing machine.  
     
     
         10 . The apparatus according to  claim 5 , wherein the control device contains a time function element which effects a switching to the second stage.  
     
     
         11 . The apparatus according to  claim 1 , wherein the position-setting assembly contains a housing block that defines a bore hole, wherein a piston is disposed within the bore hole, and wherein the bore hole includes a working space.  
     
     
         12 . The apparatus according to  claim 1 , wherein the actuating element includes two parallel pistons arranged in a housing block of the positioning-setting assembly, wherein each piston seals off a working space which receives the impulse from the pressure applying agent, and wherein an end of each piston protruding out of the housing block is connected by a yoke upon which is mounted at least one axle carrying the pressure-application roll.  
     
     
         13 . The apparatus according to  claim 12 , wherein at least one return positioning spring in the housing block is assigned to the actuating element.  
     
     
         14 . The apparatus according to  claim 13 , wherein the return positioning spring engages with the yoke wherein an end of the spring remote from the yoke lies against a spring plate connected to the yoke by a penetrating spindle and wherein an end of the spring adjacent to the yoke lies against a stop in a side of the housing block.  
     
     
         15 . The apparatus according to  claim 1 , wherein the position-setting assembly is provided with a carriage which is mounted in a displaceable manner upon a traverse and is lockable in position by a clamping device.  
     
     
         16 . An apparatus for the transport of a web-like material fed from a fold former positioned downstream of a printing machine, comprising: 
 a draw roll;    a position-setting assembly including a pressure-application roll, wherein the position-setting assembly moves the pressure-application roll to a first position where the pressure-application roll engages the draw roll and a second position where the pressure-application roll is disengaged from the draw roll; and    a control device, wherein the control device is coupled to the position-setting assembly and provides a pre-settable timing signal to the position-setting assembly to control the movement of the pressure-application roll.    
     
     
         17 . The apparatus according to  claim 16 , wherein the pre-settable timing signal controls the movement of the pressure-application roll such that when the position-setting assembly moves the pressure-application roll to the first position where the pressure-application roll engages the draw roll, the position-setting assembly moves the pressure-application roll to a first engagement pressure and a second engagement pressure, wherein the second engagement pressure is greater than the first engagement pressure.  
     
     
         18 . The apparatus according to  claim 17 , wherein the first engagement pressure increases linearly over a period of time to the second engagement pressure.  
     
     
         19 . A method for the transport of a web-like material fed from a fold former positioned downstream of a printing machine, comprising the steps of: 
 moving a pressure-application roll by a position-setting assembly to a first position where the pressure-application roll engages a draw roll and a second position where the pressure-application roll is disengaged from the draw roll; and    controlling the movement of the pressure-application roll by a pre-settable timing signal sent to the position-setting assembly by a control device.    
     
     
         20 . The method according to  claim 19 , wherein the step of moving the pressure-application roll to the first position includes the step of moving the pressure-application roll from a first engagement pressure to a second engagement pressure, wherein the second engagement pressure is greater than the first engagement pressure.