| 摘要 |
<p>Method of printing images on halves of both sides of sheets by passing each sheet seriatim four times directly in succession through a printing station (4), thereby printing the four halves of the sheet. The sheets thus printed and together folded double form a book in which the sequence of the images corresponds to the sequence of the original images.
A device for performing this method comprises a sheet turn-over path (8) along which a sheet passed through the printing station (4) can be returned to the printing station and a sheet discharge path (7) along which a sheet passed through the printing station (4) can be fed to a collector tray (12). Control means control that a sheet after the first three passes is fed into the turn-over path (8) and after the fourth pass into the discharge path (7) and a time element so controls the time of passage of a sheet through the printing station (4) that on the first and fourth pass of a sheet an image is printed on a half of the sheet which, as considered in the direction of passage, is other than the half printed in the second and third pass of the sheet.
For making a book from a set of originals printed on one side the device is provided with a document feeder (21,22) for feeding originals from both sides of a stacked set of originals (20) and a deposit device (29) having two deposit plates (30,31), in which, for printing a sheet, first two originals are fed from one side of the stack (20) and deposited on one of the deposit plates (30,31) and then two originals are fed from the other side of the stack (20) and deposited in reverse orientation on the other deposit plate.
For keeping the last page(s) of a book blank when the number of originals is less than a multiple of four, the document feeding operation can be inhibited at appropriate times in a print cycle being otherwise the same. </p> |
