| 摘要 |
Compression forces (F) in a rotary tablet compressing machine (40) are monitored and controlled to provide enhanced accuracy in determining peak compression value and continuous validation of a compression waveform. The compression waveform is repetitively sampled under computer control at a sampling frequency that is many times the frequency of the compression events. The samples are stored in a computer memory (26) until at least one complete compression event is recorded. Identification of beginning and ending samples of an individual tablet compression event are obtained from the waveform itself by locating minimum amplitude samples, or by use of a separate signal that is derived from a transducer which is responsive to the angular position of a rotating turret. Stored samples representing the compression waveform as time and amplitude data are passed to a processor (23) that statistically fits the data to an equation form which represents the ideal shape of a compression event. If the quality of the data fit falls below a preset value, the tablet associated with that coefficient is subsequently rejected by a mechanism that is activated by the computer (26), which records the event as a waveform error. A counter (25), having a user selectable maximum threshold, is incremented each time a tablet is rejected from the same punch pair as a result of a waveform error. If the maximum count threshold is reached, then the tablet compressing machine (40) is stopped by the computer (26) and a message identifying the faulty punch pair is displayed.
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