The thing that concerns me about this kind of mechanism is the tortuous film path for delicate vintage film, and the fact that contact is made on both sides of the film. In the version that I am working on there are a minimum number of rollers, each being reasonably large and having a minimum wrap-around angle, and there will be no contact whatsoever with the emulsion side, even when passing through the gate. Frame-rate and tension control will all be handled electronically without any need for contact sensor devices.
I have not seen any commercial machines that operate like this, which may be because their machines are generally used to digitise large format films that are less than about 40 years old, primarily for TV or DVD. In my case I am dealing with small format (primarily 9.5mm) amateur films that are nearly 100 years old and definitely need the 'kid glove' treatment, and where high-speed conversion is not a primary (or sensible) goal.
The British Film Institute have an archiving division that is dedicated to processing and archiving delicate vintage stock, and I believe they build their own machines to do it but there are very few technical details available on the web other than a fleeting glimpse of their setups on YouTube or Vimeo.