Canon imageRUNNER 6570 Reference Manual page 116

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Making Prints Using the Stack Bypass
Load the paper into the stack bypass.
Make sure that the height of the paper stack does not exceed the loading limit
mark ( ).
When you use the stack bypass to make copies, straighten out curled paper
prior to use, as shown below. Curled paper may cause a paper jam.
Feeding Direction
To print on the back side of preprinted paper, load it face down into the stack
bypass, as shown in the illustration below.
Feeding
Direction
When copying on the back
side of a preprinted sheet.