Integrated Design Corporation

Glen B Leanna

Eugene W Wittkopf

To control the draw exerted on a web which is being fed to the rolls of a web processing machine, a strain wave gear power transmission device has its power input shaft driven by the main drive shaft of the machine and its output shaft coupled to the rolls including the nip rolls of the machine which draw the web. The wave generator (W.G.) shaft of the device is driven continuously in a single direction and at a higher rotational speed relative to the power input shaft. Encoders provide concurrent pulses at rates indicative of the main shaft and W.G. shaft speeds. The ratio of the pulse ratio is determined and compared to a stored value which corresponds to percent of draw desired. Any resulting error signal is used to change the speed of the W.G. shaft and output shaft. High encoder pulse rates provide for resolving small speed and draw errors. The output shaft of the transmission drives groups of rolls of the machine by way of a plurality of belt drive systems.

Growing community of inventors

Green Bay, WI, United States of America

Glen B Leanna