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How to clean currency counters?

Currency counter comprising a switch which produces signal pulses corresponding to the counted number of coins, a plural-digit counter which receives said signal pulses from the switch and produces bit signals corresponding to digits representing the counted coins together with sequentially produced clock pulses corresponding to particular digits, NAND gates connected with the counter allow an output to pass therethrough and through a selector switch when the selected number of coins are counted, said output being used to effect state change of a flip-flop circuit for terminating the money counting operation.

Conventionally, money counting machines have been equipped with means for interrupting the money counting operation when a desired or predetermined number of coins have been counted. Such interrupting means comprises a counting device which includes counting circuit means adapted to produce a stop signal for stopping money counting when the desired or predetermined number of coins have been counted. In known type of such counting device, the counting circuit means includes a plurality of digit counting circuits, one for each digit of the number to be counted, and generally requires separate and complicated wiring for each counting circuit.

Recent developments in the field of semiconductor technology has made it possible to provide a single counter which has a function equivalent to a plurality of digit counters. More specifically, there is a plural-digit counter which has a plurality of digit select terminals for sequentially providing clock pulses in regular time intervals and a plurality of bit signal terminals for providing signal pulses which are representative of coins being counted. The signal pulses from the bit terminals are synchronized with the clock pulses from the digit select terminals in such a manner that the bit signals represent a figure of the digit which corresponds to the digit select terminal from which the clock pulse is being presented. One example of such plural-digit counters is MSM 5502 4-DIGIT COUNTER available from Oki Electric Company in Tokyo, Japan. These plural-digit counters have been provided for use with display devices such as display tubes, and it has been considered as being difficult to apply this type of counters to money counting machines because the duration of output signal is very short so that the signal cannot provide an adequate electric energy to actuate solenoid means which has usually been employed in a mechanism for stopping the money counting.