Patent ID: 6543350
Filing Date: 2003-04-08
Classification: B41F

Abstract:
A method to monitor contact pressure between pairs of rotating printing plates disposed on the outer surface of rotating plate and blanket rollers in an offset type rotary printing press further including a pair of rotating upper and lower form rollers which transfer printing ink to said plate roller which comprises:(a) continuously sensing during press operation with said upper and lower form rollers when a first printing plate disposed on the outer surface of said rotating plate roller in said printing press comes into registration with a second printing plate disposed on the outer surface of said rotating blanket roller in said printing press, (b) concurrently and continuously measuring the contact pressure being exerted between said pair of rotating form rollers physically abutting the rotating plate roller during the time period when the printing plates on the plate roller and the blanket roller remain in registration, said contact pressure being measured with mechanical pressure sensing devices which are disposed adjacent opposite ends of both upper and lower form rollers, (c) further sensing the angular position of said rotating form rollers during the time period when said printing plates on the plate and blanket rollers remain in registration, and (d) continuously displaying a graphical visual image of the variation in contact pressure with respect to the angular position of said rotating form rollers during said time period, and said graphical visual image being displayed is a conventional binary graph.