Knocking noise when sewing

Question

Hello,I have a problem with my machine making a knocking noise when sewing. It seems to be coming from the needle clamp. As it raises up it appears to be knocking against the plate above it. This hasn't happened before and there has been no damage done to the machine. In fact apart from this noise it seems to be sewing as normal.Is there something I can do to remedy this problem?Thank you.