Patent ID: 6451228
Filing Date: 2002-09-17
Classification: B30B

Abstract:
A method for a rotary tablet press with an angle pulse encoder for evaluating the pressing force course at a plurality of individual punches in at least one pressing station, in which the angle pulse encoder per revolution of the press rotor produces a pulse per revolution and a per rotational angle value produces an angle pulse, characterized by the following steps:rigidly assembling the angle pulse encoder relative to the rotor shaft visually moving the rotor until a predetermined punch is under the middle of a main pressing roller to provide a coarse position rotating the rotor until the pulse per revolution appears, and using a computer to count and store the angle pulses until the pulse per revolution appears computing the coarse positions of all punches, expressed in angle pulses, in relation to the pulse per revolution and producing one coarse position pulse per punch on rotation of the rotor allocating a measuring window extending on both sides of the coarse position for each coarse position scanning the pressing force course at each angle pulse in the measuring window or over the whole course of the signal per punch during operation of the tablet press using the computer to evaluate the real punch positions at the pressing force maxima or minima and determining the deviation (k) of the real positions from the coarse positions using the computer to evaluate a correction factor for determining the fine position of the punches from the individual deviations.