Tool unit, extrusion machine, and method for changing a friction wheel

An extrusion machine for continuous production of profiles from a moldable extrusion material, the extrusion machine comprising:

• a base frame comprising a swivel axis,
• a drive unit,
• at least one friction wheel connected with the drive unit and rotatable on a drive axis, the at least one friction wheel comprising at least one peripheral groove,
• at least one pinch roller,
• a tool holding device mounted at the swivel axis on the base frame and swivelable on the swivel axis in a swivel movement between a working position and a release position, wherein the tool holding device, seen in a passage direction of a profile to be produced, is arranged after the at least one friction wheel,
• a locking device having a locking position wherein the locking device keeps the tool holding device locked in the working position with respect to the base frame,
• at least one tool unit supported at the tool holding device,
• a gap between the at least one tool unit and the at least one friction wheel when the tool holding device is in the working position,
• wherein
• at the base frame a setting device is arranged in an end area of the tool holding device, wherein the end area is distanced from the swivel axis and lies at a location opposite to the drive axis of the at least one friction wheel, wherein the setting device has a setting element, wherein the setting element is adjustable with respect to the base frame and has a setting surface facing the end area of the tool holding device and a guide surface facing away from the tool holding device,
• the tool holding device comprises a support surface at the end area, wherein the support surface is distanced from the swivel axis and is arranged at a first side facing the at least one friction wheel, wherein in the working position of the tool holding device the support surface is supported at the setting surface of the setting element,
• the locking device comprises at least one pressure unit with at least one pressure element arranged at the end area, wherein the at least one pressure element is distanced from the swivel axis when the tool holding device is in the working position, but is in contact with the tool holding device at a second side facing away from the at least one friction wheel, and via the at least one pressure unit the support surface of the tool holding device is pressed at the setting surface of the setting element,
• the gap between the at least one tool unit and the at least one friction wheel has an adjustable gap width, the gap width changed by adjusting the setting element.