So every customer have to press a button on the machine and the machine will give the output in the form of printed paper on which details will be shown like: BANK NAME, Data, Time, Place and ofcourse the serial number(ie in ascending order).

I would use printer that makes noise for this purpose.

When customers press a button and "nothing happens" they tend to press the button again.

So, unless your printer makes noise or spit paper out very fast, you are going to get a lot of double presses.

Of course, you can lock the keyboard till the 'ticket' is out, but there are implications of that.

Erik