Folding pocket device for a pocket folder, having - a pocket folder with a feed entry, through which a sheet of paper can be introduced in the direction of feed into a folder compartment of the pocket folder, - a stopper device for a paper sheet, having a sheet stop, which is arranged essentially transversely in relation to the feed direction in the folder compartment, which can be moved both in and against the direction of feed, - a sheet diverter device, which comprises a sheet reversing device, which can be moved from a release position, in which it releases the feed entry into the pocket folder, into a reversing position, in which it closes the feed entry in order to reverse a sheet of paper, - whereby the sheet reversing device can be moved by means of the sheet stop from the release position into the reversing position when the sheet stop is moved against the direction of feed, characterised in that the sheet diverter device comprises a transverse rail, which is connected to the sheet reversing device and extends transversely in relation to the direction of feed into the folder compartment, whereby the said transverse rail is arranged in such a manner that the sheet stop, after a predetermined movement against the direction of feed, comes into contact with the said transverse rail until the sheet reversing device closes the feed entry, and the transverse rail is connected by at least one connecting rod in a solid frame guide to a transverse strip and the sheet reversing device comprises a plurality of reversing elements interspaced transversely in relation to the direction of feed and attached to the transverse strip. - a pocket folder with a feed entry, through which a sheet of paper can be introduced in the direction of feed into a folder compartment of the pocket folder, - a stopper device for a paper sheet, having a sheet stop, which is arranged essentially transversely in relation to the feed direction in the folder compartment, which can be moved both in and against the direction of feed, - a sheet diverter device, which comprises a sheet reversing device, which can be moved from a release position, in which it releases the feed entry into the pocket folder, into a reversing position, in which it closes the feed entry in order to reverse a sheet of paper, - whereby the sheet reversing device can be moved by means of the sheet stop from the release position into the reversing position when the sheet stop is moved against the direction of feed, characterised in that the sheet diverter device comprises a transverse rail, which is connected to the sheet reversing device and extends transversely in relation to the direction of feed into the folder compartment, whereby the said transverse rail is arranged in such a manner that the sheet stop, after a predetermined movement against the direction of feed, comes into contact with the said transverse rail until the sheet reversing device closes the feed entry, and the transverse rail is connected by at least one connecting rod in a solid frame guide to a transverse strip and the sheet reversing device comprises a plurality of reversing elements interspaced transversely in relation to the direction of feed and attached to the transverse strip.