Method and a system for production of rod-shaped articles

Abstract

A method for manufacturing rod-like articles, comprising a machine for manufacturing the rod-like articles or a feeding device for delivering the rod-like articles, a first measuring unit for measuring at least one quality parameter of the manufactured rod-like articles, a device for dividing a stream of the rod-like articles into a first stream and into a second stream, a first transferring device, which receives the first stream of the rod-like articles and transfers this stream as an output stream of the rod-like articles manufacturing system, a second transferring device which transfers inspected rod-like article to the output stream of the rod-like articles on the first transferring device.

1 . A method of manufacturing rod-like articles, where
 the rod-like articles are manufactured on a machine for manufacturing the rod-like articles or the rod-like articles are delivered from a feeding device,   a measurement is effected with a first measuring accuracy on a first measuring unit for measuring of at least one quality parameter of the manufactured rod-like articles, whereas the said quality parameter has a predefined range of acceptable values of the parameter,   the stream of the rod-like articles is divided into a first stream comprising the rod-like articles, for which the said quality parameter falls within the range of the acceptable values of the parameter and a second stream of the rod-like articles, for which the said at least one quality parameter does not fall within the range of the acceptable values of the parameter,   the first stream is transferred as an output stream of a system of manufacturing the rod-like articles by means of a first transferring device,   wherein   the second stream of the rod-like articles is transferred through a repeated quality inspection path on a measuring conveyor and a repeated measurement is effected in a second measuring unit with a second measuring accuracy higher than the first measuring accuracy of the first measuring unit,   the inspected rod-like article is transferred by means of a second transferring device to the output stream of the rod-like articles on the first transferring device, if the result of the repeated inspection of the said quality parameter for the individual rod-like article falls within the range of the acceptable values of the said parameter.   
     
     
         2 . The method according to  claim 1 , wherein the rod-like articles are manufactured by forming an endless rod and cutting the endless rod into individual rod-like articles, whereas at least one quality parameter of the endless rod is measured before cutting, where an appropriate quality parameter is assigned to an individual rod-like article on the basis of the measurements of the endless rod. 
     
     
         3 . The method according to  claim 1 , wherein, the article having the said at least one quality parameter of the value close to the limit value of the range of the acceptable values of the said parameter is directed for the repeated inspection in order to verify the values of the measured parameter. 
     
     
         4 . The method according to  claim 3 , wherein, the difference between the measured value of the said parameter and the limit value of the range of the acceptable values of the said parameter is equal to or less than the measuring accuracy. 
     
     
         5 . The method according to  claim 1 , wherein, the article having the said at least one quality parameter which falls within the range of the acceptable values of the said parameter is directed for the repeated inspection in order to verify the measurement correctness. 
     
     
         6 . The method according to  claim 1 , wherein, the stream of the rod-like articles is transferred through at least one drum conveyor. 
     
     
         7 . The method according to  claim 1 , wherein, the measurement by means of the first measuring unit is effected on at least one drum conveyor. 
     
     
         8 . The method according to  claim 1 , wherein, the output steam is the mass flow. 
     
     
         9 . The method according to  claim 2 , wherein, the article having the said at least one quality parameter of the value close to the limit value of the range of the acceptable values of the said parameter is directed for the repeated inspection in order to verify the values of the measured parameter. 
     
     
         10 . The method according to  claim 2 , wherein, the article having the said at least one quality parameter which falls within the range of the acceptable values of the said parameter is directed for the repeated inspection in order to verify the measurement correctness. 
     
     
         11 . The method according to  claim 1 , wherein the repeated measurement of the said at least one quality parameter is effected at a lower article transfer speed than the transfer speed during the first measurement. 
     
     
         12 . The method according to  claim 2 , wherein the repeated measurement of the said at least one quality parameter is effected at a lower article transfer speed than the transfer speed during the first measurement. 
     
     
         13 . The method according to  claim 3 , wherein the repeated measurement of the said at least one quality parameter is effected at a lower article transfer speed than the transfer speed during the first measurement. 
     
     
         14 . The method according to  claim 4 , wherein the repeated measurement of the said at least one quality parameter is effected at a lower article transfer speed than the transfer speed during the first measurement. 
     
     
         15 . The method according to  claim 5 , wherein the repeated measurement of the said at least one quality parameter is effected at a lower article transfer speed than the transfer speed during the first measurement. 
     
     
         16 . The method according to  claim 6 , wherein the repeated measurement of the said at least one quality parameter is effected at a lower article transfer speed than the transfer speed during the first measurement. 
     
     
         17 . The method according to  claim 7 , wherein the repeated measurement of the said at least one quality parameter is effected at a lower article transfer speed than the transfer speed during the first measurement. 
     
     
         18 . The method according to  claim 8 , wherein the repeated measurement of the said at least one quality parameter is effected at a lower article transfer speed than the transfer speed during the first measurement. 
     
     
         19 . The method according to  claim 9 , wherein the repeated measurement of the said at least one quality parameter is effected at a lower article transfer speed than the transfer speed during the first measurement. 
     
     
         20 . The method according to  claim 10 , wherein the repeated measurement of the said at least one quality parameter is effected at a lower article transfer speed than the transfer speed during the first measurement.