Cart with a support surface having a selectively adjustable contour and a printing system sheet stacker incorporating the cart

A sheet stacker for a printing system comprising:

• a housing having a first opening and a second opening;
• and
• a cart movable into and out of said housing through said first opening,
• said cart comprising:
• a frame;
• and
• a support surface connected to said frame,
• said support surface having a top receiving print media sheets entering said housing through said second opening such that said print media sheets are arranged in a stack on said support surface,
• said support surface comprising alternating first sections and second sections,
• said second sections being fixed to said frame such that said second sections are immovable at said top, and
• said first sections being movable between a first position comprising an uppermost position aligned with said second sections at said top and a second position lower than said first position relative to said top.

A method comprising:

• receiving a load on a top of a support surface of a cart,
• said cart comprising a frame;
• said support surface comprising alternating first sections and second sections,
• said second sections being fixed to said frame such that said second sections are immovable at said top,
• said first sections being movable relative to said second sections and,
• during said receiving, said first sections being in a first position comprising an uppermost position aligned with said second sections at said top such that said top of said support surface has a planar contour and provides uniform support to said load;
• and
• after said receiving of said load, moving said first sections to a second position lower than said first position relative to said top such that said top of said support surface has a corrugated contour to facilitate transferring of said load to an additional support surface.

A sheet stacking and transferring method for a printing system, said method comprising:

• moving a cart into a housing through a first opening, said cart comprising a frame and a support surface connected to said frame;
• receiving print media sheets such that said print media sheets are arranged in a stack on a top of said support surface,
• said print media sheets entering said housing through a second opening,
• said support surface comprising alternating first sections and second sections,
• said second sections being fixed to said frame such that said second sections are immovable at said top,
• said first sections being movable relative to said second sections, and
• during said receiving of said print media sheets, said first sections being in a first position comprising an uppermost position aligned with said second sections at said top such that said top of said support surface has a planar contour and provides uniform support to said stack;
• moving said cart out of said housing through said first opening;
• and
• moving said first sections to a second position lower than said first position relative to said top such that said top of said support surface has a corrugated contour to facilitate transferring of said stack to an additional support surface.