Linear bearing assembly to guide movement of roll stand on apparatus for forming an extruded sheet product

A roll stand assembly to be used in conjunction with an extrusion assembly with a sheet die that delivers flowable material to the roll stand for sheet product formation, the roll stand assembly comprising:

• a main frame;
• a roll stack sub-assembly comprising a plurality of rolls on the main frame that cause flowable material delivered to an upstream end of the roll stack to be formed into a sheet product;
• a sheet take-off sub-assembly on the main frame that directs sheet product formed by the plurality of rolls away from the plurality of rolls towards a downstream end of the apparatus;
• a sub-frame assembly;
• and
• a linear bearing assembly comprising at least one rail defining a travel path for the main frame and through which the main frame is guided in movement relative to the sub-frame assembly thereby to selectively place the roll stand in different positions relative to a sheet die on an extrusion assembly with which the roll stand assembly cooperates.