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3.2. Welding unit
The unit is lowering automatically when the welding process is started. Depending on the direction of
motor rotation (freewheels) this is taking place as follows:
1. The cam ring (pos 109) is turning towards the switching cam (pos. 140, 143).
2. This forces the switching cam to go up and to push the welding unit downwards.
3. The eccentric axe (pos.155) is driving the welding shoe via needle bearing (pos.157)
The position of the cam ring needs to be controlled by the PCB. The required information about its
current position (reference point) is provided by the micro switch (pos. 103).
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3.
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