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I think that the picture may be of a Solna Proofing Press.
When I was apprenticed compositor at Billing & Sons of Guildford in Surrey, Mr Jack Balchin was the Press Proofer. One day in about 1955-56 I was instructed to be the Boy to change some battered sorts in a forme on the press and proudly done so.
Unfortunately I left my typescale where the flat pieces beside the cog runners move as shown here. When he motioned the cylinder for a proof, the end of the ruler became trapped in the wheel and jammed it solid. The Engineers Department was required to raise the cylinder and remove it. The cog tooth took the pice of steel out the typescale but it lasted me a life time still! Much bad language improved my vocabulary that day and I certainly was more careful in the future.The typescale bears the scars as pictured to this day.
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I've never seen one like this. There is no obvious adjustment, you can see that the roller is held down by plain wheels at each end which run against the top bars of the frame.