adjust the acceleration or deceleration of said advance means to drive said instantaneous gap value g toward said nominal gap value, whereby the number of documents passing through {HEAD ~ the system} per {TAIL ~ unit time} may be controlled and maximized 
per
adjust the acceleration or deceleration of said advance means to drive said instantaneous gap value g toward said nominal gap value , whereby the number of documents passing through { HEAD ~ the system } per { TAIL ~ unit time } may be controlled and maximized
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH