English to Italian Tech/Engineering Engineering (general)

Come tradurreste "riding over an outer edge"?

"With the guide bar 43 and the knife arm 45 spread by the secondary guide track 23, via follower wheel 27, a chicken leg, or like, suspended from its relevant hook (7 in Figure 1) can easily enter between the support rod 43B and the cutting knife 51. The leg positioner arm 59 is kept in its innermost position by the positioner roller 29 riding over an outer edge 23A of the secondary guide track 23."


Grazie!