which the signal of 34 0 34 level is applied under the condition it begins to count or clock when the counting signal pap takes the level 34 0 34 after the counter 56 has counted a predetermined number namely after the lapse of predetermined time all inputs fed to an and gate 57 take the level 34 1 34 to set an srff 58 whereupon the output from the q terminal of the srff 58 drops to issue a jamming signal jam so as to reset srff 34 through a differentiating circuit 59 and at the same time to generate an alarm signal alm j thus the operation of the machine is stopped and an alarm signal is displayed when jamming of traveling bank note occurs as start switch 2 is depressed again srff 9 is set since the counting signal pap takes the level 34 0 34 due to jamming of bank note whereupon the output from the srff 9 is delivered through the or gate 41 as the driving signal drv when jamming is released the counting signal pap takes the level 34 1 34 to reset srff 9 so that delivery of the driving signal drv is stopped when a bank note passes under normal condition counter 56 is reset before srff 58 is set by the signal from counter 56 in a counting circuit 60 a counting signal pap is applied through a differentiating circuit 61 onto an input terminal of an and gate 62 and the driving signal drv of 34 1 34 level is applied on the other.