Abstract: A method for compressing powder or granular material by a rotary tabletting machine (1), includes an initial step in which an opening (2) is filled with material to be compressed, a compacting step (C), in which a load is gradually applied to the material until a maximum value (F1) is reached, a first releasing step (R1) in which the load is removed, a precompression step (P), in which a second load (F2) is applied to the material, a precompression step (MP), in which the second load (F2) is maintained, and a second releasing step (R2), in which the second load is released, a main compression step (CP), in which a third load (F3), that is not smaller than the previous loads (F1,F2), is applied to the material, and a final ejecting step in which the tablet is discharged from the opening (2).

Abstract: A stamping device for a tablet making machine includes a pair of coaxial stamping heads (1) which enter, on opposing faces, a matrix carried by a matrix plate (2) formed around a rotary turret (3), a pair of punches (4) which are guided by respective holes made in the turret (3) and which are adapted to be coupled with the stamping heads (1) in axial alignment therewith, and a coupling (13) for joining the stamping head (1) and the respective punches (4). The device includes also a locking mechanism (6), which comprise a screw member (7) passing through a transverse hole (8) made close to the end of the respective punch (4). The screw member (7) has a head (9) having a concentric semi-spherical section (10) that matches a complementary recess connected to the outer surface of the respective punch (4).

Abstract: The improvements relating to capacitive devices for measuring the diameter of a dielectric fiber are based on a particular shaping of the capacitor plates, such as to allow electric field reductions at the edges to be compensated for and hence capacitance measurements to be unaffected by fibre vibrations.

Abstract: In order to determine the overall phase and amplitude distortion undergone by signals sent over a transmission channel, a pulse sequence generated at one end of the transmission channel is received at its other end at a first and a second input of a measuring instrument including, downstream of a receiving stage connected to the second input, regenerating circuitry for producing replicas of the original pulses. The latter are fed, along with the received distorted pulses, to a phase and amplitude comparator working into a spectral analyzer which displays the spectral-density difference between a received pulse and a replica of the corresponding transmitted pulse. The second input of the instrument may be connected to the output side or to the input side of an equalizer which supplies the received pulses to the first input thereof and whose parameters are to be adjusted on the basis of the measurements made.

Abstract: To convert a sample of an amplitude-modulated voltage wave into binary pulses, the sample is simultaneously compared in two coders with two sets of threshold voltages of positive and negative polarity, respectively. Either one of the two coders yields in unbroken succession of pulses, having the same polarity as the sample, whereas the other coder produces a combination of both positive and negative pulses. Following inversion of the pulses issuing from one coder, and upon suppression of the pulses of one polarity (e.g. negative), the two pulse trains are combined into a series of bit groups each representing the absolute amplitude value of a respective sample. The final step in the processing of any sample is the generation of a sign bit in accordance with the polarity of the unipolar pulse train emitted by one of the coders; this sign bit is then transposed to the beginning of the corresponding group of amplitude bits.