Apparatus for regulating fiber tuft quantities supplied to a carding machine

A combination of a carding machine with an apparatus for regulating fiber quantities to be supplied to said carding machine;

• the apparatus comprising:
• (a) a duct for guiding the fiber material therein;
• (b) means for pneumatically advancing the fiber material in said duct;
• (c) a feed mechanism to advance fiber material to said duct at a variable flow rate;
• (d) a regulator connected to said feed mechanism for varying the flow rate;
• (e) a pressure sensor disposed in said duct;
• (f) means for generating a plurality of first electric signals representing actual pressure values detected by said pressure sensor;
• (g) means for generating a second electric signal for correcting a selected one of the first electric signals to obtain a third electric signal representing a corrected actual pressure value, the second electric signal representing a rate of change between the selected first electric signal and an immediately following one of the first electric signals;
• and
• (h) means for applying said third signals to said regulator for varying the flow rate of the fiber material, advanced by said feed mechanism, as a function of said third signals.