Article sorter with active discharge

1. An article sortation system, comprising:

an article sorter having an article support surface moving in a longitudinal direction,

a plurality of discharge conveyors extending from said article support surface, wherein said sorter comprises diverters that are adapted to initially displace an article on said article support surface without rotating that article then continue to displace that article to discharge that article from said article support surface to one of said discharge conveyors; and

wherein at least one of said discharge conveyors comprises a driven surface made up of plurality of generally parallel driven conveying lanes, at least one of said driven conveying lanes having a high-friction conveying surface and an adjacent one of said driven conveying lanes having a low-friction conveying surface, wherein said high-friction conveying surface having a coefficient of friction that is higher than a coefficient of friction of said low-friction conveying surface.

2. The article sortation system as claimed in claim 1 , wherein said discharge conveyors extending in a generally lateral direction perpendicular to said article support surface.

3. The sortation system as claimed in claim 1 , wherein the high-friction conveying surface has a conveying speed that is greater than a conveying speed of said low-friction conveying surface.

4. The sortation system as claimed in claim 1 , wherein said driven surface has a travel speed that exceeds a travel speed of said article support surface.

5. The sortation system as claimed in claim 1 , wherein said driven surface varies in travel speed in response to variation in travel speed of the article support surface.

6. The sortation system as claimed in claim 1 , wherein said at least one of said discharge conveyors comprising a longitudinally oriented spitter roller at an interface between the article support surface and the driven conveying surface.

7. The sortation system as claimed in claim 6 , wherein said at least one of said discharge conveyors comprising a transition plate upstream the spitter roller in the longitudinal direction wherein a diverted article begins rotation by the spitter roller while the article is on the article support surface and said transition plate and continues rotation by the driven conveying surface on the discharge conveyor.

8. The sortation system as claimed in claim 1 , wherein said article support surface defined by a plurality of laterally extending slats and said diverters comprise pusher shoes travelling along one or more said slats to selectively laterally divert an article travelling on said article support surface to one of said plurality of discharge conveyors.

9. A method of sorting articles, comprising:

supporting articles with an article sorter having an article support surface moving in a longitudinal direction,

discharging articles to a plurality of discharge conveyors extending from said article support surface, including initially displacing an article on said article support surface with a diverter without rotating that article then continuing to displace that article to discharge that article from said article support surface to one of said discharge conveyors; and

wherein at least one of said discharge conveyors comprises a driven surface made up of plurality of generally parallel driven conveying lanes, at least one of said driven conveying lanes having a high-friction conveying surface and at least one of said driven conveying lanes adjacent to said high-friction conveying surface having a low-friction conveying surface, wherein said high-friction conveying surface having a coefficient of friction that is higher than a coefficient of friction of said low-friction conveying surface.

10. The method as claimed in claim 9 used to sort articles at least some of which are flexible bags.