Handling Technologies for Different-Sized Banknotes for a Worldwide Recycling ATM

Kazushi Yoshida, Hitachi, Ltd.
Akira Nomiyama, Hitachi, Ltd.
Junichi Tamamoto, Hitachi, Ltd.
Shingo Noro, Hitachi, Ltd.
Riichi Kato, Hitachi-Omron Terminal Solutions Co. Ltd.

1. Outline
     A worldwide recycling ATM that can re-dispense deposited banknotes is in demand. Such recycling ATMs must be able to accept and re-dispense different sized banknotes. It has been impossible, however, to handle various sizes of banknotes because no technologies are available that can stack and feed them. We have developed new banknote-handling mechanisms that can handle different sizes so as to create a worldwide recycling ATM. We have also developed a simulation system that can predict the behavior of banknotes to increase the reliability of the ATM.

2. Contents of Technologies
     Figure 1 is a photo of the ATM we developed. It includes a banknote-recycling module, a passbook printer, a card-handling unit, and a PC card controller. The specific features of the ATM are its large capacity and the afore-mentioned recycling function. 
Figure 2 shows the banknote-recycling module, which mainly consists of a cash in/out slot, a banknote validator, a temporary stacker, and cash recycling boxes. Paper banknotes that are deposited by a customer into the cash in/out slot are separated one by one, then fed to the temporary stacker via the validator, which recognizes the denomination of each banknote and checks for counterfeit money. When a customer confirms the total amount of money indicated on the display, the banknotes are fed from the temporary stacker to the cash boxes, where they are stacked according to the denomination. These banknotes are then ready to be dispensed to other customers. From the processing described, we can see that the cash in/out slot and the temporary stacker have to handle different sized banknotes
    Figure 3 shows the banknote motion in the new sheet-stacking mechanism for handling various sizes sheet in the cash in/out slot. The looped plastic sheets and the stack guide deform the banknote into a wavy form to generate a breaking force that ensures the banknotes are stopped correctly. Owing to the breaking force, the banknotes stop as shown in Fig. 3(a) after their trailing edge passes through a nip of stack rollers A and B. Next, if the sensor detects the leading edge of the banknote that follows, the sheet roller rotates 120 degrees. During the rotation, one of the flat plastic sheets of the sheet roller hits the banknote between the looped plastic sheet and the stack guide, as shown in Fig. 3(b). It does this to push the banknote onto the stack and, thus, avoid a collision with the following banknote.
    Figure 4 shows a cutaway drawing of the developed sheet-handling mechanism in the temporary stacker. The mechanism has a simple structure consisting of a drum, a reel, and a tape between them. It takes in banknotes by winding the tape and the sheets around the drum together, and it discharges banknotes by rewinding the tape. The sheet-handling mechanism not only stacks the different various sized banknotes but also feeds them.
We also developed a simulation system that can predict the behavior of a sheet passing through sheet handling machinery by means of FEM. The system consists of a 3-dimensional CAD system, solver with FEM, and a database for the FEM model of the sheet. By using this system, the designer can modify the configuration or dimensions of the guide plates or rollers according to the simulation results, as shown in Fig. 5.

3. Conclusion
Our ATM is the first product in the world that can dispense and deposit different sized  banknotes. It enables customers to deposit and transfer money by using a self-service terminal even when the bank is closed. It can also improve financial security against counterfeit money through the use of special recognition technology in the bill validator. It will thus significantly improve the convenience and efficiency of banking.


Please feedback us! wwwadmin@jsme.or.jp

All Rights Reserved, Copyright (C) 1996, The Japan Society of Mechanical Engineers.