Automatic Online Defective Elements-Checking-and-Removing Device for Flexographic Printing Presses

Abstract

The invention of automatic online defective elements checking and removing device relates to flexographic printing presses. Between a first vacuum conveying platform and a second vacuum and separating-conveying platform on the top of a mobile frame is provided a defective elements remover including a defective removing air ejector operated by a valve, which receives output signal from the online computerized visual QC station at the flexographic printing press and a receiver for carrying the ejected elements away from the platforms. Under the mobile frame is provided a vacuum pump and vacuum distribution tube connected each other with steel wire enforced hose and a ball valve is used to adjust the vacuum in order to prevent the printed labels from drifting on the conveyor belts. Both of the platforms are separately driven by motors and via toothed belts.

1 . In a flexographic printing presses an automatic online defective elements checking and removing device comprising:
 two stages of vacuum-conveying platform including a first vacuum-conveying platform and a second vacuum and separating-conveying platform;   both of the platforms being mounted on top of a mobile frame;   each of the platforms being separately driven by a respective motor;   a defective element remover located between the first vacuum conveying platform and the second vacuum and separating conveying platform;   a defective removing air ejector operated by a valve;   an online computerized visual QC station at the flexographic printing press arranged such that detection of a defective element causes operation of the air ejector;   a vacuum pump and vacuum distribution tube on the mobile frame;   and a valve to adjust the vacuum to the platforms in order to prevent the printed labels from moving on the conveyor belt.   
     
     
         2 . The device according to  claim 1  wherein there are four universal casters under the mobile frame. 
     
     
         3 . The device according to  claim 1  wherein there are screw bolts for adjusting the height to stabilize the frame. 
     
     
         4 . The device according to  claim 1  wherein the second stage includes a plurality of belts for transporting the QC passed labels. 
     
     
         5 . The device according to  claim 4  wherein a gap between belts widens from start to end, making gaps between lines of labels during transport on the belts, facilitating the process of collection, counting, packing and stacking. 
     
     
         6 . The device according to  claim 1  wherein the vacuum pump and vacuum distribution tube are connected each other with steel wire reinforced hose. 
     
     
         7 . The device according to  claim 1  wherein a ball valve is used to adjust the vacuum in order to prevent the printed labels from moving on  t he conveyor belt.