Abstract: A bowed roll lubrication system for a bowed roll of the type having an elongated shaft and a plurality of spools disposed about the shaft for rotation. A plurality of ball bearings are disposed along the shaft and each of the bearings has an inner race in contact with the shaft and an outer race in contact with one of the spools. A through passageway extends between the races and cooperates with the races in defining a ball chamber. The lubricant system is designed to provide lubricant to the interior of the ball chambers and includes a lubricant reservoir and a lubricant line extending between the reservoir and the interior of the roll so that the lubricant may be interjected to the interior of the roll at a predetermined location. The interjected lubricant is then directed through the ball chambers in a desired pattern.

Abstract: A digital tachometer provides a signal proportional to output speed which clocks a multivibrator whose "on" time is selectively set as a function of desired speed. The output is filtered and any deviation from one-half the peak voltage becomes the speed error signal which is pulse width modulated to provide an error signal to the prime mover. Proper selection of multivibrator parameters provides for a plurality of output pulse widths which accommodate sensitive speed regulation over a low speed range.