each of said rear floating support mechanisms includes a supporting bracket having side support plates that are secured to said support frame and that downwardly extend in the vertical direction at a distance spaced from each other, and supported brackets having vertical side plates that are secured to said {HEAD ~ rear side frame} of {TAIL ~ said conveying unit} and that rearwardly extend at a distance spaced from each other 
of
each of said rear floating support mechanisms includes a supporting bracket having side support plates that are secured to said support frame and that downwardly extend in the vertical direction at a distance spaced from each other , and supported brackets having vertical side plates that are secured to said { HEAD ~ rear side frame } of { TAIL ~ said conveying unit } and that rearwardly extend at a distance spaced from each other
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