GENERATOR FOR ULTRASONIC WELDING Russian patent published in 2004 - IPC

FIELD: ultrasonic welding of different type materials including plastics, namely generators for ultrasonic welding, possibly used for making coiled foils, tubes and other products welded by continuous seam. SUBSTANCE: generator includes power supply unit; constant voltage to ultrasonic frequency converter whose outlet is connected with magnetostrictive transducer designed for placing on it welding tip; frequency pulse setting generator; electric current pickup; comparator; electric current setter; proportional control unit with transfer function A = K (1 + 1/pT) where K - transmission factor of proportional unit, p - operator, T - time constant of integration process; adder; frequency setter and unit for controlling converter of constant voltage to ultrasonic frequency. Signal outlet of electric current pickup is connected with first inlet of comparator whose second inlet is connected with electric current setter. Outlet of comparator through proportional control unit is connected with first inlet of adder whose second inlet is connected with frequency setter. Outlet of adder is connected with respective inlet of pulse frequency setting generator whose outlet through unit for controlling above mentioned converter is connected with inlet of said converter. EFFECT: enhanced stability of working characteristics of generator at changing load at side of welded materials or other welding process parameters. 3 cl, 11 dwg