The purpose is to keep the bed pressed against the washers of the leveling screws.
I doubt the springs have anything to do with you having to occasionally re-level your bed. More likely it's simply the wood moving around with temperature, moisture and just plain old settling into place. Wood is a living material and it tends to move with time.
A secondary purpose is to make the bed "give" a bit in case the head moves too far down. Instead of hitting a dead stop the bed can move down a little bit to avoid damage to the printer.
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tommyph1208 55
Dosn't the springs allow the bed to dislocate when/if your printhead hits it... instead of just ruining nozzle and/or print bed?
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