Rojek thicknesser problems

[steve66]

Ex demo machine, producing a knocking sound when machining wood, and wood stutters when going through machine.
Anyone has similar problems or any solutions.
Thanks in advance

 

[deema]

Not familiar with the machine, but it sounds like the pressure roller or the wood is knocking / catching against the dust cowel.

 

[Distinterior]

To me, it sounds a bit like a chain/cog is skipping in the drive chain ...?