HF welder for plastics articles and/or plastics-coated paper - has bridge switch between tool and generator, with two unified resonators to equalise load fluctuations

摘要

Parent patent described H.F. tool for welding thermoplastics mouldings or thermoplastics-coated paper which is supplied by an H.F. generator where an H.F. line has a bridge circuit between generator and welding tool. The bridge circuit shares the power input between 2 equal consuming devices as appropriate, whilst a remaining 4th. switch point is terminated by an absorber. In this addn. both equal consuming devices are H.F. resonators which, whilst sepd. by a partition are combined into 1 single welding tool. Frequency constancy of the generator is ensured by presence of 2 consuming devices (as called for by parent patent) whose power consumption and conditions affecting it are now rendered reliably identical i.e. any variations of the load conform for both consuming devices. Consequently, the generator is independent of any such load fluctuations.