Etch Press Build

[m_c]

Going by that photo, the springs only serve to raise the roller up when tension is removed.

If you design so just the screws lift the roller, you're likely to get a bit free movement while going from under tension to lifting the rollers. It just means you need to turn the tension screws a bit further to lift the roller.
By adding suitable springs, it could simplify the screw design, as the spring would hold the end of the screw engaged with the bearing block/carrier.
You could implement it so both the screw and spring do the lifting.

Any method will work, it's just you need something to lift the roller, otherwise it could be a bit of a faff getting everything loaded between the rollers.