Abstract: An elongate sheet to be folded into pages is fed to a folding station where parts of the sheet at intervals along its length are successively engaged by grippers to form upwardly directed folds therein and intermediate parts of the sheet are formed into downwardly directed loops. The folded and looped sheet is then advanced by the grippers to a delivery station. During this advance, the loops are flattened to form intermediate folds by engaging a conveyor belt moving more slowly than the grippers. At the delivery station the grippers open to release the folded sheet.