SHEET ALIGNING DEVICE AND SHEET TREATING DEVICE PROVIDED WITH THE SAME

摘要

The invention relates to a sheet-aligning device and a sheet-treating device provided with the same. The sheet-aligning device is intended for a leaf-turning device (23) and is arranged in a subframe (20) in the sheet-treating device. The sheet-aligning device has a holder (24) intended for a bundle of sheets to hold the spine of the bundle of sheets in an essentially horizontal position. A supporting rod (31) is used to support a hanging portion of the bundle of sheets. According to the invention, this supporting rod is formed with an approximately parabolic supporting surface (41, 43) engaging the bundle of sheets (25). Sheet bundle lifting means (29, 30) are available to successively raise the bundle of sheets (25) upwards in the subframe (20), such that the underside of a just turned sheet is in a predetermined vertical position relative to the subframe. With the aid of supporting rod operating means (32-39), the supporting rod (31) is pivoted such that the supporting surface (41, 43) of the supporting rod engages the lowermost sheet in the bundle of sheets with curved surface portions having an increasing radius of curvature the thinner the bundle of sheets during the turning of the sheets, and such that each sheet which is the next to be turned is held in essentially the same curved shape.