detecting the position of the coin just passing therethrough and a coin detecting unit connected with the photo sensors for converting the position of the coin into a binary logic level application_number US 25278381 A description the present invention will now be described in connection with one embodiment thereof with reference to the accompanying drawings in the coin packaging apparatus as shown in fig1 the coins are consecutively introduced from a rotary disc 1 which is rotating in the direction of arrow a onto a guide passage 2 and are conveyed by a conveyor belt 3 which is made to run in the direction of arrow b until they are stacked in a coin stacking cylinder 4 in this case the guide passage 2 is equipped with both a rotary stop pin 5 for opening and closing the passage 2 and a pair of photo sensors 6a and 6b for counting the number of the coins being conveyed on the passage 2 and for detecting the position of the same as best seen in fig1 the rotary stop pin has an upwardly projecting semi circular portion or notched head at the top thereof which is in a retracted position when the coins are moved toward the coin stacking cylinder during counting operation and which is projected into the coin passage through its rotation when the supply of the coins is stopped when the number of the coins stacked in the coin stacking.