Auto-control equipment of hull-removing roll in rice-hulling machines

An apparatus for separating hulls from unhulled rice comprising:

• a hopper for accommodating unhulled rice, said hopper having a bottom opening for discharge of unhulled rice,
• a first roll rotatable about a longitudinal axis below said opening,
• a second roll located adjacent said first roll and rotatable about a longitudinal axis generally parallel to the longitudinal axis of the first roll, said second roll engaging said first roll below said bottom opening of the hopper,
• drive means for rotating the first and second rolls in opposite directions whereby the hulls and rice are separated from unhulled rice delivered to said first and second rolls from said hopper bottom opening,
• first means mounting said second roll for general lateral movement toward and away from said first roll,
• second means for yieldably biasing the first means in a direction to move said second roll toward said first roll,
• third means for sensing the contact pressure between the first and second rolls,
• and fourth means responsive to said third means for moving said second roll toward said first roll and maintaining a substantially constant contact pressure between said first and second rolls.