Device for printing-pressure control

Claim 1

In a printing press having a feeding roller, an offset roller and a printing roller, said offset roller being positioned in contact with said printing roller and with said feeding roller for printing on sheets being processed, each of said rollers being provided with a bearing, and feed-control means, a control arrangement for controlling printing pressure between two of said contacting rollers comprising a sensor for measuring a bearing pressure exerted within a first bearing of one of said rollers, said pressure varying in dependence upon the angle of rotation of said one roller, said sensor being positioned on said first bearing and extending in a plane passing through the central effective line of said force; a measured pressure value processor electrically connected to said sensor to receive a signal corresponding to the measured pressure value therefrom; an indicator of a desired pressure-value to generate a signal corresponding to said desired pressure value; means for comparing said signal of the measured pressure-value with the signal of the desired pressure-value; and positioning means electrically connected to said comparing means and to a second bearing of a second one of said contacting rollers, said positioning means being operative for receiving a compared signal from said comparing means and positioning said second bearing of said second roller in dependence upon the said angle of rotation and in response to said compared signal thereby adjusting the printing pressure between two rollers arranged in contact with each other.