Stacks which are about to be subdivided by a sword-like tool at a dividing station are monitored by a spring-biased mechanical sensor which causes the generation of signals serving to change the position of the stack at the dividing station with reference to the tool and/or vice versa if the monitored...http://www.google.com.tw/patents/US4662816?utm_source=gb-gplus-share專利 US4662816 - Method of breaking up stacks of paper sheets or the like
