Method of producing tablets in a press and a tablet press for carrying out the method

A method of manufacturing tablets in a press of the type having a rotary die plate defining a plurality of dies, each including a vertically adjustable die plunger located below said plate and movable into a respective die to form a tablet therein, a rotary filling wheel disposed above a portion of said die plate and a rotary dosing wheel disposed above another portion of said die plate, adjustable driving means operative for driving said filling and dosing wheels, a filling cam track cooperating with said plungers, a vertically adjustable dosing cam operatively connected to said plungers for adjusting the vertical position of said plungers in said dies, first electronic means for measuring individual compressing forces applied against the tablet material in said dies, and second electronic means for amplifying an output of said measuring means, the method comprising the steps of:

• measuring compressing forces acting on the tablet material in said dies to define deviations of the measured compressing forces from a preset nominal value;
• preliminary automatically adjusting the rotary speed of the filling and dosing wheels by means of an electronic control circuit connected to the adjustable driving means, in response to said deviations;
• applying the signals corresponding to values of said measured compressing forces to said electronic circuit wherein said signals are compared with a preset nominal value thereof to define a resulting difference therebetween;
• adjusting the vertical position of the dosing cam in response to said resulting difference to thereby readjust the weight of the tablets to be produced;
• thereafter measuring the compressing forces acting on the tablet material;
• and thereupon finally automatically adjusting the rotary speed of the filling and dosing wheels in response to the newly measured compressing forces to thereby continuously change the rotary speed of the filling and dosing wheels until the preset nominal value of the compressing forces will be reached.