Rotary-type tabletting machine with lubricant spraying means

A rotary tabletting machine, comprising:

• a turn table defining a plurality of rotation positions, said turn table having a plurality of penetrated holes each comprising a die provided at fixed intervals in a ring arrangement;
• each die, provided with a pair of punches, each pair of punches situated above and below its respective die, each pair of punches being rotated together with the turn table and adapted to execute a piston operation so that tablets are continuously produced by compressing pharmaceutical material filled in each die associated with each pair of punches executing the piston operation;
• a spraying chamber with an upper open end for inserting an upper punch of any one of each pair of punches and enclosing each die associated with said upper punch of each pair of punches when said turn table moves to a rotation position which is after a rotation position where a compressed tablet is discharged and before a rotation position where pharmaceutical material is filled in each die associated with said upper punch of each pair of punches;
• lubricant spraying means connected with said spraying chamber for spraying lubricant in said spraying chamber, said lubricant spraying means continuously supplying lubricant in said spraying chamber;
• and
• pulsating air vibration generating means connected with said spraying chamber, for feeding compressed air to said spraying chamber for diffusing the lubricant sprayed in said spraying chamber, said pulsating air vibration generating means supplying oscillating energy of low frequency which is enough to periodically change the pressure in said spraying chamber so as to disperse the lubricant sprayed in said spraying chamber to attach the lubricant uniformly to each die and each associated pair of punches.