mechanism comprises the plunger 36 spring 37 and ball 38 the major role of the plunger mechanism is to push the idle friction roller 31 towards the roller 30 when the cover 3 is closed a gap between two rollers is required when the cover 3 is in the open position for this purpose the cover 3 comprises the cam shaped ridge 39 and returning spring 40 the cover plate 3 includes the bar 25 which locks the soldering wire channel 13 with expansion mouth 14 and the cavity 26 designed to accommodate the friction roller mechanism the compartment 2 for the bobbin of soldering wire 10 as the part of the cover 3 is made from a transparent plastic to enable the operator to easily determine when the bobbin 10 is running out of wire the compartment 2 consists of the bobbin pin 12 located and in combination with the shape of the cover 3 allows convenient access for a bobbin replacement a more detailed view of the feeding mechanism and electronic board 31 without the base frame plate 9 is shown on fig6 the electronic board 41 is located under the base plate 9 and comprises the infrared soldering wire sensors 28 29 and 30 pyro electric infrared motion sensors 42 cover proximity switch 43 and most of the electronic components including the multi position switch 5 of soldering material doses the fig7 schematic logic block diagram of the preferred embodiment and consists of the infrared sensors of soldering wire 27 28 and 29 pyroelectric infrared motion sensors 42 electronic programmable device 44 electrical motor 32 multi position switch 5 cover proximity switch 43 and touch switch 44.