Patent ID: 8119045

Claim:
A method for test pressing tablets consisting of n layers in a rotary tablet press, said rotary press having a rotationally driven rotor, the rotor having only a single pair of punches associated therewith, the single pair of punches comprising one upper punch and one lower punch, the rotary press further having a plurality of die bores, punch guides, at least one press station and a control cam system, wherein the control cam system has a filling cam and an ejection cam for the lower punch, and wherein pressure rollers of the press station and the cams are adjustable in height by suitable adjustment drives, the method comprising: moving the rotationally driven rotor and the single pair of upper and lower punches to a defined filling position and then stopping the rotor; filling the die bore, which is associated with the pair of punches with material for a first layer of a tablet; moving the filling cam into a first position, the ejection cam into a lower position, and the pressure rollers into a first pressing position by means of associated adjustment drives; rotating the rotor by a full revolution; testing, without ejecting the tablet, a first layer of the n layer tablet during the rotation of the rotor and then stopping the rotor; stopping the single pair of punches in the filling position; adjusting the filling cam to a second filling position; adjusting the pressure rollers to a second pressing position; thereafter filling the one die bore containing the first layer with material for a second layer; rotating the rotor by a further full revolution and then stopping the rotor; stopping the single pair of punches again in the filling position; and repeating the foregoing steps until at the n-th revolution of the rotor, the lower punch ejects the multi-layer tablet by the ejection cam in an ejection position.