Due to the fact that in the developed ACS, pressure adjustment on the discharge section must be done automatically without the need for human operator, the mentioned design (Fig. 2) could not be applied in the form of ACS. Hence, a new mechanism was considered to replace the traditional design. In the new mechanism, the pressure on the discharge section of the whitening machine could be controlled by placing a sliding plate in front of the machine discharge opening. The amount of pressure on the discharge section could be adjusted by changing the compression of a pair of springs located between two sliding plates in the body of the mechanism. According to the fact that the pressure generated by the new design must be equal to that of the traditional design, the pressure on the discharge section was calculated using the following formula: