Multiple purpose feedback control system

Multi-purpose feedback control system comprising:

• a detecting means for detecting a controlled variable and converting the detected variable to an electrical feedback output signal;
• a signal converting means for receiving the said electrical feedback signal and converting said feedback signal into a form of angular or rotary displacement in proportion to the strength of said signal;
• a limit control switch having a movable arm which is rotated in accordance with said rotary displacement and a pair of contacts to compare said displacement with a preset desired value;
• a pair of transmission electro-magnetic devices which are controlled by said limit control switch according to upper and lower limits;
• pair of electro-magnetic switches actuated through energizing and de-energizing of a pair of solenoids in accordance with the actuation of said transmission electro-magnetic devices;
• a braking electro-magnetic device controlled by said control switch through the action of said electro-magnetic switches;
• a set of drive means for driving a mainshaft of control gear means;
• a control gear set adapted to rotate through the actuation of said transmission electro-magnetic devices and to automatically effect braking through energizing of the braking electro-magnetic device when said transmission electro-magnetic devices are de-energized;
• a last control gear controlled by said control gear set;
• a variable resistor controlled by said last control gear and performing corresponding adjustment of the controlled variable;
• and
• a pair of safety switches to limit adjustment of said variable resistor.