Abstract: Device for preventing double counting is provided, which is to be used in a paper sheet counting apparatus having a holder for moving between a paper sheet depositing position and a paper sheet counting position, a rotating cylinder provided with a plurality of suction heads for sucking and turning over paper sheets one by one for counting when the holder is moved to the paper sheet counting position, and a counting device for counting the number of paper sheets. The device according to the invention includes a start sensor for detecting paper sheets deposited into the holder, a paper sheet sensor for detecting the presence or absence of paper sheet at the paper sheet depositing position, and a control circuit for instructing the counting operation to start.

Abstract: There is proposed a paper sheet counting machine provided with a safety device, the machine including a paper sheet counting mechanism and a double-leaf type sound-proof covers made movable between an open position to gain easy access to said counting mechanism and a closed position at which said sound-proof covers extend above the section containing said counting mechanism. The safety device is constructed such that the closing movements of the sound-proof covers are stopped if an obstacle is present adjacently or engaged with the edge faces of the sound-proof covers. The safety device comprises an obstacle detecting member and a control circuit responsive to a signal generated from said obstacle detecting member for generating a signal to stop the closing movements of the sound-proof covers, or alternatively it comprises a control circuit including a timer.