Method for adjusting the web tension of a processing machine

Abstract

For adjusting the web tension of a processing machine for processing a continuous material, in particular a shaftless printing press, the continuous material is subdivided into at least two web-tension sections, with one web-tension section being limited by two clamping points; the web tension is adjusted in the at least two web-tension sections when the continuous material comes to a standstill.

1 . A method of adjusting a web tension of a processing machine for processing a continuous material, comprising the steps of subdividing the continuous material into at least two web-tension sections; limiting one of the web-tension sections by two clamping points; and adjusting a web tension in the at least two web-tension sections when the continuous material comes to a standstill, further comprising ascertaining the web tension in the web-tension sections using measuring elements via a driving torque of at least one of the clamping points that limits the web-tension section, and/or via operators. 
     
     
         2 . A method as defined in  claim 1 , wherein the method for adjusting the web tension of a processing machine for processing a continuous material is a method for adjusting the web tension of a processing machine which is a shaftless printing press. 
     
     
         3 . A method as defined in  claim 1 , further comprising ascertaining the web tension in the web-tension sections using measuring elements via a driving torque of at least one of the clamping points that limits the web-tension section, and/or via operators. 
     
     
         4 . A method as defined in  claim 3 , wherein said ascertaining the web tension includes using the measuring elements configured as load cells. 
     
     
         5 . A method as defined in  claim 1 , wherein said adjusting includes adjusting the web tension in a web-tension section by acting on at least one of the clamping points that limits this web-tension section. 
     
     
         6 . A method as defined in  claim 1 , said adjusting by acting on the at least one clamping point includes adjusting the web tension in the web-tension section via angular displacement, rate feedback, and/or limitation of a driving torque of the at least one clamping point that limits the web-tension section. 
     
     
         7 . A method as defined in  claim 1 , further comprising cascading an action applied to at least one of the clamping points to further clamping points. 
     
     
         8 . A method as defined in  claim 1 , wherein said adjusting of the web tension in the at least two web-tension sections includes adjusting in succession, following a course of the continuous material. 
     
     
         9 . A method as defined in  claim 1 , further comprising clamping the continuous material at a first clamping point and a second clamping point, adjusting the web tension in a web-tension section between the first clamping point and the second clamping point, clamping the continuous material with a third clamping point located between the first clamping point and the second clamping point along a course of the continuous material. 
     
     
         10 . A method as defined in  claim 9 , further comprising taking into consideration a change in the web tension when the continuous material is clamped via the third clamping point when the web tension is adjusted in the web-tension section between the first clamping point and the second clamping point. 
     
     
         11 . A method as defined in  claim 9 , further comprising adjusting the web tension in a web-tension section between a first clamping point and the third clamping point, clamping the continuous material at a fourth clamping point located between the first clamping point and the third clamping point along the course of the continuous material. 
     
     
         12 . A method as defined in  claim 11 , further comprising releasing the continuous material from the third clamping point, clamping the continuous material at a fifth clamping point located between the third clamping point and the second clamping point along the course of continuous material, adjusting the web tension in a web-tension section between the fourth clamping point and the fifth clamping point, and clamping the continuous material at the third clamping point. 
     
     
         13 . A method as defined in  claim 12 , further comprising adjusting the web tension in a web-tension section between the fifth clamping point and the second clamping point. 
     
     
         14 . A method as defined in  claim 1 , wherein the method for adjusting the web tension of a processing machine is performed in the processing machine configured as a printing press, and further comprising configuring the clamping points as printing units selected from the group consisting of an infeed printing unit, an outfeed printing unit, and other printing units. 
     
     
         15 . A method as defined in  claim 1 , wherein said adjusting includes adjusting in a web-tension section via an angular displacement of one of the clamping points that limits this web-tension section, ascertaining a change in web tension in this web-tension section induced by the angular displacement, and, based thereon, ascertaining a physical property of the continuous material. 
     
     
         16 . A method as defined in  claim 15 , wherein said ascertaining includes ascertaining an elasticity module of the continuous material. 
     
     
         17 . A computer program with program code means for carrying out the method recited in  claim 1  when the computer program is run on a device selected from the group consisting of a computer and an appropriate arithmetic unit. 
     
     
         18 . A computer program product with program code means stored on a computer-readable data storage device for carrying out the method defined in  claim 1  when the computer program is run on the device selected from the group consisting of a computer and an appropriate arithmetic unit.