Jogger

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A device comprising a vibrating table, the action of which squares and neatly stacks a pile of sheets of paper.

In sheetfed offset lithography, a jogger is one of three moveable devices typically found on the delivery pile of a sheetfed printing press (especially that used in offset lithography) that ensures that the printed sheets remain neatly stacked. Joggers are usually oriented on three sides of the delivery pile, a fixed front gate forming the fourth side.