| 摘要 |
In apparatus having a pair of spaced apart cylinders rotatable on respective axes that are substantially parallel and lie in a common plane, each cylinder has at each end thereof a smaller diameter concentric bearer ring. Each bearer ring on each cylinder is adjacent to a bearer ring on the other. For each bearer ring there is a roller supporting member that is movable in directions parallel to said plane and transverse to said axes, each roller supporting member being adjacent to its bearer ring, between that bearer ring and an adjacent roller supporting member. Two rollers on each supporting member, at opposite sides of said plane, rollingly engage its bearer ring. An adjustable spacer member reacting between adjacent supporting members substantially on said plane hold them spaced apart by an adjustably variable distance that determines the distance between the cylinders. Other rollers spaced to opposite sides of said plane rollingly engage each bearer ring to confine it against radial displacement, at least certain of said other rollers being under bodily bias that urges the cylinders towards one another. Preferably, all rollers are spaced like distances from said plane.
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