Extrusion machine, method for distance control and method for changing a friction wheel in an extrusion machine

An extrusion machine (1) for the continuous manufacture of profiles (2) from a moldable extrusion material (3), comprising

• a main frame (5),
• at least one friction wheel (4) rotatable about a drive axis (8), which friction wheel (4) is provided with at least one peripheral groove and is in drive connection with a drive device (9),
• a tool holding device (6), which is mounted on a pivot axis (7) held on the main frame (5) and can be pivoted about the pivot axis (7) between a working position and a release position, the tool holding device (6) being arranged downstream of the friction wheel (4), as viewed in the pass-through direction of the profile (2) to be manufactured,
• a locking device (11), which locking device (11) in its locking position holds the tool holding device (6) locked in its working position relative to the main frame (5), and
• at least one tool unit (12), which tool unit (12) is supported on the tool holding device (6), in particular is accommodated in an accommodation chamber (22) arranged in the tool holding device (6), and includes or forms at least one stripping area (30) facing the friction wheel (4) with at least one stripping element (31) for the extrusion material (3) to be molded by the friction wheel (4),
• wherein
• the tool unit (12) is supported on its side facing away from the friction wheel (4) with the interposition of a first sensor unit (25) on the tool holding device (6), in particular on a first adjusting surface (23) of the accommodation chamber (22).